MATLAB Functions Binghamton（MATLAB函数宾厄姆顿）.pdfVIP

MATLAB Functions What is a MATLAB function? A MATLAB “function” is a MATLAB program that performs a sequence of operations specified in a text file (called an m-file because it must be saved with a file extension of *.m). A function accepts one or more MATLAB variables as inputs, operates on them in some way, and then returns one or more MATLAB variables as outputs and may also generate plots, etc. (sometimes a function doesn’t return any output variables but instead just generates plots, etc.). How do I Create a new MATLAB function? Since an m-file is nothing more than a text file it can be created using any text editor – however, MATLAB provides its own editor that provides some particular features that are useful when writing/editing functions. To open a new m-file: In the MATLAB command window, go to FILE on the toolbar, select NEW, then select M-FILE. This opens the MATLAB editor/debugger and gives an empty file in which you can create whatever m-file you want. What do I have to put on the First Line of a MATLAB function? st The 1 line of a function must contain the “function definition,” which has a general 1 structure like this (see also the specific example below) : function [Out_1,Out_2,…,Out_N] = function_name(In_1,In_2,…,In_M) where Out_1,Out_2,…,Out_N are the N output variables and In_1,In_2,…,In_M are the M input variables; If there is only a single output variable use: function Out_1 = function_name(In_1,In_2,…,In_M) If there is no output variable use: function function_name(In_1,In_2,…,In_M) What do I have to put after the 1st line? After the first line, you just put a sequence of MATLAB commands – with one command per line – just like you are computing in MATLAB in the command line environment. This sequence of commands is what makes up your program – you perform computations using