Some functions take as the input argument a name of another function, which is specified as a string.
#Manual de matlab 2017 en español pdf how to#
In the previous section you have learned how to create the function files. Strings are discussed in Section 2.5 of this tutorial. For instance,str = 'programming in MATLAB is fun' The character string is a text surrounded by single quotes. ThenC = f(A, B) C = 1.4142 3.1623 2.2361 4.1231įor the later use let us mention briefly a concept of the string in MATLAB. Note that this function also works with arrays. You can evaluate this function in a usual wayf(3,4) ans = 5 MATLAB has a command inline used to define the so-called inline functions in the Command Window. Sometimes it is handy to define a function that will be used during the current MATLAB session only. Since no output argument was used in the call to function descorder a sorted array a is assigned to the default variable ans. In this case an information about a permutation used will be lostdescsort(a) ans = 35.0000 You can execute function descsort without output arguments. To demonstrate functionality of the function under discussion leta = descsort(a) b = 35.0000 j = 3 1 4 2 3.1416 0.1500 -10.0000 A simple trick used here allows us to sort an array of numbers in the descending order. Recall that this function sort numbers in the ascending order. MATLAB built-in function sort is used here. This function takes one input argument, the array of real numbers, and returns a sorted array together with a permutation used to obtain array b from the array a. % Second output parameter j holds a permutation used to obtain % array b from the array a. Here is an example of the function filefunction = descsort(a) % Function descsort sorts, in the descending order, a real array a.
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We invoke this file by typing its name in the Command Window and next pressing the Enter or Return keyfirstgraph For more details about command plot see Section 2.8.1 of this tutorial. The command plot creates the graph of the sinc function using the points generated in two previous lines. Special operators in MATLAB and operations on one- and two dimensional arrays are discussed in detail in Tutorial 3, Section 3.2. This tells MATLAB to perform the componentwise division of two arrays sin(x) and x. Array x holds 1000 evenly spaced numbers in the interval while the array y holds the values of the sinc function y = sin(x)/x at these points. This suppresses display of the content of both vectors to the screen (see Tutorial 1, page 5 for more details).
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Note that the semicolon follows both commands. In the next two lines arrays x and y are created. They are added to improve readability of the code. First line begins with the percentage sign %. Here is an example of a small script file% Script file firstgraph. To open the m-file from within the Command Window type edit firstgraph and then press Enter or Return key. If you have at least two files with duplicated names, then the one that occurs first in MATLAB's search path will be executed. Make sure that your file is saved in the directory that is in MATLAB's search path. Chose a name for your file, e.g., firstgraph.m and click on Save. Once you are done with typing, click on File, in the MATLAB Editor/Debugger screen and select Save As. Here you will type your code, can make changes, etc. You will be presented with the MATLAB Editor/Debugger screen. To make the m-file click on File next select New and click on M-File from the pull-down menu. The function files may take input arguments or return output arguments. Script files do not take the input arguments or return the output arguments.
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There are two kinds of m-files: the script files and the function files.
#Manual de matlab 2017 en español pdf code#
Topics discussed include the m-files, inline functions, control flow, relational and logical operators, strings, cell arrays, rounding numbers to integers and MATLAB graphics.įiles that contain a computer code are called the m-files. Numerous examples included in this text should help a reader to learn quickly basic programming tools of this language. Even with a limited knowledge of this language a beginning programmer can write his/her own computer code for solving problems that are complex enough to be solved by other means. Edward Neuman Department of Mathematics Southern Illinois University at Carbondale tutorial is intended for those who want to learn basics of MATLAB programming language.