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Function Definition and Execution

 

In this page, I will explain on how to define a user defined Matlab function (meaning your own function) and how to call (execute) the function.

 

Function Definition and Execution in a same file - Typical Definition

 

The most typical way of defining and executing a function is to define a function in a file (*.m) and call (execute) the function in another file (*.m) or command line as in the following examples.

 

< Example 1 >

 

Step 1 : Save following code in a file named myAdd.m (Name the file name same as function name

    function r = myAdd(a,b)

       r = a + b;

 

Step 2 : Save following code in another file (example, fTest.m)

    c = myAdd(2,4)

 

Step 3 : Run fTest.m

    r1 = myAdd(2,4)

    r2 = myAdd([1 2 3],[4 5 6])

     

    you will get the result as follows.

     

    r1 =

     

         6

     

     

    r2 =

     

         5     7     9

 

 

Function Definition and Execution in a same file

 

You can define a function and execute the function in a same file as shown in the following example

 

Step 1 : Create a file as shown below (In this example, I save the code in InFileFunction.m)

    function main

       c = myMultiply(2,4)

       d = myDivide(2,4)

    end

     

    function y=myMultiply(a,b)

        y = a * b;

    end

     

    function y=myDivide(a,b)

        y = a / b;

    end

 

Step 2 : Run the saved file (InFileFunction.m) and you will get the result as follows.

    c =

     

         8

     

     

    d =

     

        0.5000