MATLAB - Environment Setup; MATLAB - Syntax; MATLAB - Variables; MATLAB - Commands; MATLAB - M-Files; MATLAB - Data Types; MATLAB - Operators; MATLAB - Decisions; MATLAB - Loops; MATLAB - Vectors; MATLAB - Matrix; MATLAB - Arrays; MATLAB - Colon Notation; MATLAB - Numbers; MATLAB - Strings; MATLAB - Functions; MATLAB - Data Import; MATLAB. How to loop through nested folders in Matlab? If I have a folder, containing x amount of folders, each containing an arbitrary amount of folders which contain an arbitrary number of nested folders etc with files that need to be run through an algorithm. MATLAB Answers. When this is the case, MATLAB speeds up execution of the entire loop, including the forand endstatements. Using the for-loop, you can repeat processes in the program with simple and very easy codes. Ask Question Asked 8 years, 2 months ago. Learn more about loop MATLAB. This means that the CPU will be able to run other programs that have meaningful work to do while your program waits. The reason for that is because every time the loop iterates, the value of c increases by 1. Repeating then means looping or cycling a process usually with the objective of approaching a desired goal or target. The for-loop does exactly the same thing that the array subtraction operation did. The for loop allows us to repeat certain commands. This is very simple to achieve using the MATLAB editor using the following two steps:. Matlab 'For' loop and line plotting [Beginners question] Ask Question Asked 3 years, 9 months ago. I was recently answering a question that came in from a MATLAB user on this blog. Working and constructing for loops in Matlab happen the exact same way they do in other programming languages, at the only difference that in Matlab the first index the for loop goes through is never zero. Here we will create a function in MATLAB which will check whether the number is palindrome or not. In your original code you overwrite the elements of F_l in each iteration of the for c loop. MATLAB nested loop. Thus, a collection of MATLAB functions can lead to a large number of relatively small files. 0000 And 1 is not equal to 1. Loops behind the scenes. To write a function, click here: http://www. The difference is that while loops check the condition at the beginning of the loop while do while loops check the condition at the end of the loop. Learn more about if else, loop, logical or. Each m-file contains exactly one MATLAB function. We'll call it while loop. Using break comes in handy when you have nested for loops (i. How to create simple IF statements / loops in MATLAB. Contrary to the situation a few years ago, nowadays there exist interfaces for most of the common message passing frameworks that allow researchers to do at least basic hardware-in-the-loop prototyping directly from MATLAB. (Hint: when using the notation for i=1:n MATLAB does not actually create the vector 1:n. That is the MATLABic way. I have a matrix A{1x24 cell} Each cell contains ages of people, but each cell has a different length (i. Using loops, you will draw some nice pictures of fractals and shapes drawn with random dots. The basic syntax of a for loop is:. First we will create an empty vector with variable name 'vec' and then using the for loop we will check whether the number is either divisible by 3 or 5 and we will a ppend the number to the vector 'vec'. Background on parfor-loops. unnecessary loops in your code to make the code easier to read or to make easier to generalize at a later time, but in many, many cases, removing a loop would make the code better. m) Use “for” loop if you know how many time you want to. I have a matrix A{1x24 cell} Each cell contains ages of people, but each cell has a different length (i. In your original code you overwrite the elements of F_l in each iteration of the for c loop. oT avoid this problem, \preallocate" the matrix with the zeros command. In compiled languages such as FORTRAN, C, or C++, code can be stored in one or more source files that are linked together. In nested loops, break exits from the innermost loop only. Learn more about if statement, for loop. Our primary concern is: if we need something like it – could we simulate this behavior in MATLAB?. You cannot run a loop from 1 to infinity in Matlab. (Hint: when using the notation for i=1:n MATLAB does not actually create the vector 1:n. But I'd rather not have to include an END with each one. DO - WHILE loop in matlab? Showing 1-13 of 13 messages. 3 About the examples All arrays in the examples are assumed to be of class double and to have the logical ﬂag turned off unless it is stated explicitly or it is apparent from the context. ” True is always true. i know i can operate with both colums or row, in this case i'm basically telling him to go to fill the nth (1<=n<=100) with the result of the w/s operation, with w = nx. Asked by Mehdi. Thus, a collection of MATLAB functions can lead to a large number of relatively small files. Learn more about. The for statement overrides any changes made to index within the loop. Loops: Loops are used when you want to perform an action multiple times. A "While" Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. Note that MATLAB represents irrational numbers such as pi with rational approximations, except when using the symbolic math toolbox. until the last column is used. Since the root locus consists of the locations of all possible closed-loop poles, the root locus helps us choose the value of the gain to achieve the type of performance we desire. Keywords: MATLAB keywords such as if, elseif, else, end, for are coloured blue. This document is not a comprehensive introduction or a reference man-ual. MATLAB help 6. The "end" command is very important here - it tells MATLAB where to end the sequence of commands making up the for loop. So, my if statement is placed in a for loop where I am going through elements of a matrix to see if they pass the if statement or not - if they do, I do nothing to them and if they don't, I have to do stuff with them. m) Use “for” loop if you know how many time you want to. n = length(X) n = length(X) returns the size of the longest dimension of X. Octave has a not fully functional JIT compiler. • MATLAB is interpreted, errors are easier to fix. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. There are different kinds of loops but the most common one in MATLAB is the for-loop. Vector operations in Matlab allow you to apply a "single" command to an entire array. A loop would have to execute its body multiple times, but "if" executes the body only 1 time or 0 times. arguments for including it in the language, or excluding it from the language). Learn more about loop MATLAB. I want to apply a if else if loop as follows : if v==1 statements elseif v==1. The "end" command is very important here - it tells MATLAB where to end the sequence of commands making up the for loop. Recreate the functionality of a while loop using a for loop. Here we will create a function in MATLAB which will check whether the number is palindrome or not. How to create simple IF statements / loops in MATLAB. 0000 statements else statements end. while loops. Demonstrating while loops. Most notably, MATLAB can operate directly on vectors and matrices whereas in C you must operate directly on individual elements of an array. How can I make summation in a loop in matlab ? Dear All, Ni=[8 46 26 106] N=∑Ni. Drag and drop a statechart simulink block from the simulink library (from the stateflow category) and double clic. We could then employ MATLAB to design a new controller in order to, for example, dampen out the oscillation in the response. The problem is that we want to keep rolling the dice until we get our number (4 in this case). MATLAB For Loop Tutorial - Duration: 13:37. The "end" command is very important here - it tells MATLAB where to end the sequence of commands making up the for loop. The basic syntax of a for loop is:. Matlab provides two types of loops, a for-loop (comparable to a Fortran do-loop or a C for-loop) and a while-loop. 0000 statements else statements end. Additionally, it will automatically scale if you have many sensors as inputs with the same conditions. I have a question related to parallel computing, how to run two loops simultaneously, and how to programmatically stop a for loop or update the information inside a while loop. Creating Vectors with a Loop 7. In this screencast: Example of volume of a water tank; Writing a function with an if-else statement to calculate water volume for different water heights; Download m-file: watervol. Following section shows few examples to illustrate the concept. i don't know any coding language, i'm writing directly into MATLABi still don't get what is wrong with my code. Loop performance is optimal when every line of code in the loop can take advantage of the JIT-Accelerator. In terms of their ability to repeat a series of calculations, for loops and while loops are equivalent. MATLAB - Environment Setup; MATLAB - Syntax; MATLAB - Variables; MATLAB - Commands; MATLAB - M-Files; MATLAB - Data Types; MATLAB - Operators; MATLAB - Decisions; MATLAB - Loops; MATLAB - Vectors; MATLAB - Matrix; MATLAB - Arrays; MATLAB - Colon Notation; MATLAB - Numbers; MATLAB - Strings; MATLAB - Functions; MATLAB - Data Import; MATLAB. (Hint: when using the notation for i=1:n MATLAB does not actually create the vector 1:n. The “break” statement causes MATLAB to skip to the loop’s “end” statement. ME 350: while loops in Matlab page 1. There are also a lot of built-in functions to initialise matrices, etc. After reading this MATLAB Loop topic, you will understand loop types and you will know the for and while loops theory, and examples. As an example, assume you want MATLAB to numerically find the minimum of the function \(y=3x^2+11x-2\) using the built-in min command. MATLAB allows to use one loop inside another loop. MATLAB Function Reference : find. Hello, i'm trying to create a loop counter that will add increments of 1 every time I click a pushbutton. [The drawnow is to give MATLAB a chance to process your Ctrl-C to break out of the loop. A{1} is 2362x1, while A{2} is 2344x1, etc. Hint: If the ``fid'' parameter is omitted, then printing will go to the screen by. Can I nest an if statement in a for loop?. Now a word about this particular book. DO - WHILE loop in matlab? Showing 1-13 of 13 messages. MATLAB - Environment Setup; MATLAB - Syntax; MATLAB - Variables; MATLAB - Commands; MATLAB - M-Files; MATLAB - Data Types; MATLAB - Operators; MATLAB - Decisions; MATLAB - Loops; MATLAB - Vectors; MATLAB - Matrix; MATLAB - Arrays; MATLAB - Colon Notation; MATLAB - Numbers; MATLAB - Strings; MATLAB - Functions; MATLAB - Data Import; MATLAB. It wasn't used inside the loop. On a PC, for example, if properly installed, one may enter MATLAB with the command: C> matlab and exit it with the command: >> quit On systems permitting multiple processes, such as a Unix system, you will find it convenient, for reasons discussed in section 14, to keep both MATLAB and your local editor active. - Video Summary 1. Errors associated with floating point arithmetic (and an example of a basic loop) 7. Some basic tips on speeding up matlab code and on exploiting vectorisation are mentioned in the Optimisation section of our matlab page. MATLAB programs are stored as plain text in files having names that end with the extension ``. Logical operators in MATLAB are those that link logical statements together and return true (1) or false (0) in a logical matrix depending upon the nature of the logical operator and the value of the components. Hence the while loop and for loop in Matlab is same as in C. Thus, a collection of MATLAB functions can lead to a large number of relatively small files. This post can also be said as the back bone for this post or can also be said as an extension to the above post. And: We find the for-loop syntax is more than two times faster that the while-loop syntax here. A loop would have to execute its body multiple times, but "if" executes the body only 1 time or 0 times. Computational hot spots in code generally appear as loops or repeated segments of code, where the repeated operations are naturally parallel; in other words, they don’t depend on each other. Write a MATLAB for. In Matlab, the loop must be completed by the word end. As far as I know the matlab for-loop works similar to the for_each-loop that can be seen in many programming languages these days, or maybe the range-for in c++11. If statement in a loop. Calling this function with "y = mysin(1)" will not return y = 5 (the first element of the sin variable created by EVAL) -- it will return the sine of 1, because when the function was parsed there was no variable named sin and so the usage of sin on the last line was parsed as a call to the built-in SIN function. MATLAB performs matrix operations at blinding speed, but can be downright glacial at times when loops are to be executed a great many times, since it must do a certain amount of translation of each statement every time it is encountered. (Hint: when using the notation for i=1:n MATLAB does not actually create the vector 1:n. 3 About the examples All arrays in the examples are assumed to be of class double and to have the logical ﬂag turned off unless it is stated explicitly or it is apparent from the context. Learn more about save to array. The while statement is more suitable for basing the loop. Learn more about loop, cell array. Knowing MATLAB will definitely be a plus on your resume. 3 About the examples All arrays in the examples are assumed to be of class double and to have the logical ﬂag turned off unless it is stated explicitly or it is apparent from the context. arguments for including it in the language, or excluding it from the language). A count-controlled loop in MATLAB is called a for loop. count-controlled loops. Loops are an important component of flow control that enables matlab to repeat multiple statements in specific and controllable ways Simple repetition in matlab is controlled by two types of loops: For loops While loops. There are two basic kinds of loops in programming: counted loops and conditional loops. Introduction to MATLAB What is MATLAB? MATLAB (“MATrix LABoratory”) is a tool for numerical computation and visualization. Why For Loops? Like all loops, "for loops" execute blocks of code over and over again. MATLAB Central. MATLAB Marina - For Loops Exercises. Long example: The code below is used to convert from meters to feet and yards using MATLAB for loop. Chapter 19 - How Do I Use Conditional Statements? 20. Can I nest an if statement in a for loop?. MATLAB: For loops: Odds sum. Here are some examples. Hint: If the ``fid'' parameter is omitted, then printing will go to the screen by. The while loop repeatedly executes statements while condition is true. Is there any way to reset a for loop for the current iteration it is on? I mean if the for loop is working and I have an if statement if that condition is true I want to restart the loop on whatever iteration the for loop is on?. INTRODUCTION TO FOR AND WHILE LOOPS IN MATLAB For loops and while loops allow the computer to run through a series of commands, repeatedly. Note that MATLAB represents irrational numbers such as pi with rational approximations, except when using the symbolic math toolbox. e x(5) and. Let's go ahead and clear our workspace and our screen. Repeat one or more statements for a fixed number of times. Assume userNume is always greater than or equal to 1. MATLAB/Octave Python Description; doc help -i % browse with Info: help() Browse help interactively: help help or doc doc: help: Help on using help: help plot: help. So: You should prefer the for-loop on collections such as lists, when possible. For loop's syntax looks like this: for loop_index = vector code; end This will iterate each element of the vector. Matrices in MATLAB 9. Errors associated with floating point arithmetic (and an example of a basic loop) 7. m file as a new m-file. Check out the compa. [The drawnow is to give MATLAB a chance to process your Ctrl-C to break out of the loop. Now a word about this particular book. When will this while loop finish? This is a greatly simplified version of your outermost while loop. 5 are displayed. Both can typically be used interchangeably, but it is easier to create an infinite while loop than an infinite for loop. it can’t be serial) Matlab workers evaluate iterations in no particular order and independently of each other. For example, if we want to ask a user for a number between 1 and 10, we don't know how many times the user may enter a larger number, so we keep asking "while the number is not between 1 and 10". This demonstrates that the closed-loop system in its current form is stable and the dominant poles are underdamped. Example: MATLAB Plots In this group of examples, we create several cosine MATLAB plots, work with different resolution and plot parameters Example: MATLAB programming (Script Files) In this example, we program the plotting of two concentric circles and mark the center point with a black square. There is no goto statement in MATLAB, but there are a few other commands for use with loops that may help you: continue: This statement will skip the remaining commands in a for or while loop and move on to the next iteration. Loops in Matlab Repetition or Looping A sequence of calculations is repeated until either 1. Matlab CAN parallelize a loop containing a reduction variable. Your best option is to use a while loop. go to the main window and press CTRL-C with MATLAB being able to respond to your command. break: This statement will terminate execution of a for or while loop. Hence the while loop and for loop in Matlab is same as in C. The remaining $4,650 is taxed at 28%. "Or Statement" using if operator. Chapter 19 - How Do I Use Conditional Statements? 20. 321a Boyd Graduate Studies. If the conditional expression evaluates to a matrix, MATLAB evaluates the statements only if all elements in the matrix are true (nonzero). break is not defined outside a for or while loop. Remember, you can always put the code you wanted to write into comments! A Selected Set of Functions. In compiled languages such as FORTRAN, C, or C++, code can be stored in one or more source files that are linked together. Second step: Condition in for loop is evaluated on each iteration, if the condition is true then the statements inside for loop body gets executed. If Statements, Loops and Recursion If statements (actually, these are if expressions) OCaml has an if statement with two variations, and the obvious meaning: if boolean-condition then expression if boolean-condition then expression else other-expression. The support packages are available for 32-bit and 64-bit Windows, 64-bit Mac OS and 64-bit Linux. So I posted this question on r/Octave, but I figured posting it here would be good too. Due Date: April 24, 2008. Repeat one or more statements for a fixed number of times. When he was done with the loop, he only had the final value of Y but not all of them that he had calculated. " Matthew Evans, Assistant Professor of Physics. Using stateflow is an easier alternative if you do not wish to use the function block wherein you can write an m-script for the same. MATLAB Function Reference : length. An operation that is performed repeatedly is called a repetitive operation or, more common, a loop. Drag and drop a statechart simulink block from the simulink library (from the stateflow category) and double clic. fprintf('***Rules of the. To break the algebraic loop, you need to insert in the loop a nondirect feedthrough block. Problem is, on some random values of x (as far as I can tell they are random), although they should satisfy the inequality in the 'IF' statement, the 'IF' statement gets ignored, the for loop continues and thus the final 'hit' value is wrong. In the following examples we will see how this is implemented in Matlab, but nevertheless how good programmers we are, some mistakes will happen. MATLAB allows to use one loop inside another loop. 0000 statements else statements end. This agrees with the result of our closed-loop simulation from above. Thus, a collection of MATLAB functions can lead to a large number of relatively small files. I want to apply a if else if loop as follows : if v==1 statements elseif v==1. In MATLAB you can use the “for-loop” in very easily form as shown below:-. The syntax for a nested for loop statement in MATLAB is as follows −. Recreate the functionality of a while loop using a for loop. MATLAB - Environment Setup; MATLAB - Syntax; MATLAB - Variables; MATLAB - Commands; MATLAB - M-Files; MATLAB - Data Types; MATLAB - Operators; MATLAB - Decisions; MATLAB - Loops; MATLAB - Vectors; MATLAB - Matrix; MATLAB - Arrays; MATLAB - Colon Notation; MATLAB - Numbers; MATLAB - Strings; MATLAB - Functions; MATLAB - Data Import; MATLAB. Learn more about. The "break" you used at the code you provided is inside the inner loop, so it only ends the inner loop. In Matlab, the loop must be completed by the word end. for loops Programs for numerical simulation often involve repeating a set of commands many times. To exit a function, use return. To get the most precise answer possible, you will want to give MATLAB a very large number of points - say, 1 million. A list can be looped over with for or while. Layout: It is good programming practice to indent conditional statements and loops to make the structure of your code as clear as possible. thanks for the advice. How to limit the number of for Loops while Learn more about for loop, while loop MATLAB. write_file. Then the loop starts by using as index the first column of the array, then the second column etc. MATLAB Programming I - Conditionals and Loops Programming in MATLAB Step 1: Create a m-file (xxx. Thanks for A2A. The MATLAB iteration structure (for-loop) repeats a group of statements a fixed, predetermined number of times. - Video Summary 1. MATLAB nested loop. Combine If statement and for loop?!. it doesn't accept the colon operator. MATLAB performs matrix operations at blinding speed, but can be downright glacial at times when loops are to be executed a great many times, since it must do a certain amount of translation of each statement every time it is encountered. com and the Mathworks site. looping or iteration): • while loops • for loops • MATLAB also has implicit loops over. Use the function name isevenorodd. In each round through the loop, add the outcome of switch() at the end of the vector VAT. m Prints out numbers in a loop echo_number. Errors associated with floating point arithmetic (and an example of a basic loop) 7. Is there some other way of doing this? I want my script to always ignore errors and just try again with a new iteration. Following section shows few examples to illustrate the concept. Give myself some more space here and let's do a comment here. Matlab Code - Loops, branches, and control-flow The MATLAB code has its own instructions for flow of control statements like ' for-loops ', ' while ' and ' if-elseif ' branching. Learn more about if statement, for loop. The Do/While Loop. How to use “for-loop” in MATLAB. If the conditional expression evaluates to a matrix, MATLAB evaluates the statements only if all elements in the matrix are true (nonzero). Some loops execute for a prescribed number of times, as controlled by a counter or an index, incremented at each iteration cycle. This means the nested while loop will finish slower, given the same number of computations to perform, compared to the nested for loop. Browse other questions tagged matlab for-loop nested-loops or ask your own question. These are part of the for loop family. Like where this loop will iterate?. An operation that is performed repeatedly is called a repetitive operation or, more common, a loop. Loops in Matlab Repetition or Looping A sequence of calculations is repeated until either 1. If the conditional expression evaluates to a matrix, MATLAB evaluates the statements only if all elements in the matrix are true (nonzero). For example, preallocate a 10-element vector, and calculate five values:. Matlab was designed for dealing with numbers, not strings. Can I nest an if statement in a for loop?. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Ask Question Asked 2 years, 5 months ago. I'm writing a program that performs animal tracking (a rat/mouse) in an open field box, and sends pulse (voltage) data to a DAQ device based on the rat's current location. a for loop within a for loop) because you can exit a loop based on a condition that is common to both loops. To repeat a number of statements, can be solved with a for or a while loop. In MATLAB you can use the "for-loop" in very easily form as shown below:-. Some loops execute for a prescribed number of times, as controlled by a counter or an index, incremented at each iteration cycle. Is there any way to reset a for loop for the current iteration it is on? I mean if the for loop is working and I have an if statement if that condition is true I want to restart the loop on whatever iteration the for loop is on?. In the above example, that's a single calculation - but it doesn't have to be. The JIT must know the return type of all functions called in the loops and so you can't include user functions in the loop of JIT optimized loops. Matlab provides various types of loops to handle looping requirements including: while loops, for loops, and nested loops. If statement in a loop. it doesn't accept the colon operator. In addition, it has been shown that a loop with an inner for loop performs more computations per unit time than a loop without it or one with an inner while loop. There are different kinds of loops but the most common one in MATLAB is the for-loop. Whenever MATLAB passes this instruction you will be able to interact with MATLAB for a (very) short time, e. • To write for loops, it is never ever advisable to write a doubly scripted for loop (Matlab becomes extremely slow!) It is better to write one for loop, vectorizing your code. I have a question regarding implementing a for and if loop with cell arrays. MATLAB Marina - For Loops Exercises. In general, when the loop begins, you know how many times it will repeat. In this tutorial, we will introduce the root locus, show how to create it using MATLAB, and demonstrate how to design feedback controllers that satisfy certain performance criteria through the use of the root locus. arguments for including it in the language, or excluding it from the language). This post can also be said as the back bone for this post or can also be said as an extension to the above post. MATLAB Lesson 8 - Logic and Control. How do I break out of nested loops using the Learn more about nested, loops, return, error, try, catch, break MATLAB. Hint: If the ``fid'' parameter is omitted, then printing will go to the screen by. Chapter 16 - How Can MATLAB Help Solve Engineering Problems? 17. When will this while loop finish? This is a greatly simplified version of your outermost while loop. If X is a vector,. The syntax for a nested for loop statement in MATLAB is as follows −. Chapter 17 - How Can I Make My Program Run Better? 18. The "input" of a for loop is a variable and a vector of values. In fact what is happening is that "single" command is applied over and over again to every element of the array. How to Do Parallel Computing in MATLAB • Core MATLAB already implements multithreading in its BLAS and in its element-wise operations • Beyond this, the user needs to make changes in code to realize different types of parallelism… in order of increasing complexity: – Parallel-for loops (parfor). Each m-file contains exactly one MATLAB function. - The break Statement The break statement lets you exit early from a for or while loop. I want to use loop from i=180:1 and again next inserted loop j=180:1 Does matlab allow that? how I access (180,180) first rather then (0,0). Control structures are blocks of code that determine. for loops Programs for numerical simulation often involve repeating a set of commands many times. There are different kinds of loops but the most common one in MATLAB is the for-loop. ME 350: while loops in Matlab page 1. I have a question related to parallel computing, how to run two loops simultaneously, and how to programmatically stop a for loop or update the information inside a while loop. which means MATLAB has to check if it still fits in the given memory,. Learn more about if statement for loop combine. I'm having a bit of confusion with matlab. If you inadvertently create an infinite loop (that is, a loop that never ends on its own), stop execution of the loop by pressing Ctrl+C. Recreate the functionality of a for loop using a while loop. Matlab is a powerful tool to manipulate arrays, vectors, and matrices. Due Date: April 24, 2008. The for loop allows us to repeat certain commands. Writing and calling functions In this chapter we discuss how to structure a program with multiple source code files. , work in MATLAB, you will be well-prepared for beginning programming in other languages as well. This means the nested while loop will finish slower, given the same number of computations to perform, compared to the nested for loop. Creating Vectors with a Loop 7. the if condition is not satisfied and MATLAB will move to the elseif section. Learn more about if else, loop, logical or. for-Loop is one of the most common phrases in MATLAB and other programming languages. This compiler allows the acceleration of for-loops in Matlab to almost native performance with certain restrictions. Learn more about if statement, for loop. It can also display information graphically. Drag and drop a statechart simulink block from the simulink library (from the stateflow category) and double clic. A{1} is 2362x1, while A{2} is 2344x1, etc. Use the function name isevenorodd. Lead instructor: Mike Fitzpatrick. This becomes easy as long as you understand how ‘for loop’ works and what is the de nition of the recurrent sequence called Fibonacci Numbers. Decrementing for loop in MATLAB. The difference is that while loops check the condition at the beginning of the loop while do while loops check the condition at the end of the loop. I'm having a bit of confusion with matlab. For more information on MATLAB, please visit the MathWorks home. Matlab vectorisation tricks. If parfor cannot run on multiple workers (for example, if only one core is available or M is 0), MATLAB executes the loop in a serial manner. The preceding statements are perfectly legal MATLAB statements, but they are an inefficient way to create the x and y vectors. There are also a lot of built-in functions to initialise matrices, etc. Vector operations in Matlab allow you to apply a "single" command to an entire array. loop over a list of numbers. So: You should prefer the for-loop on collections such as lists, when possible. For more information on those topics see one of our tutorials on vectors (Introduction to Vectors in Matlab), matrices (Introduction to Matrices in Matlab), vector operations (Vector Functions), loops (Loops), plotting (Plotting), executable files (Executable Files), or subroutines (Subroutines).