MATLAB: Need help with the function

my function

How can I input my own function? I type function [dist,vel,acc]= free_fall(t)or anything just involving the word function and receive an error message reading "FUNCTION keyword use is invalid here. This might cause later messages about END". I save the function as the script. Can not seem to figure it out.

Best Answer

Function definitions are not allowed inside the Command Window or insider an M-script file, but only inside a function-M-file. You can recognize them by the first word "function".

The functions are defined either as sub-functions, after the main function has finished, or as nested function inside another function.

function Out = MainFunction(In)
disp('I''m the main function');
Nested;
SubFunction;
Nested;
    function Nested
      disp('I''m nested'');
    end
  end
function SubFunction
disp('I''m the sub function');
end

If you use nested function or any function is closed by end, all functions in an M-file must be closed by a trailing end.

Related Solutions

MATLAB: What does this error means-“Function definitions are not permitted at the prompt or in scripts.”

To define a function, create a new m-file on the command line

>> edit myfun.m

write your function in this file, first non-command line must contain the function header using the "function" keyword, like function y = myfun(x). Save it, and call it from the command line or within another function or within a script

myfun(123)

You've probably created a file with some matlab commands, i.e., a script, and somewhere below in this script you defined a function. That's not allowed. Either move your function to a separate file, or convert your script to a function by adding a first line like

function mycommands

Now it's a function, and you can define a function within this function. However, such a nested function is visible only within this function, not at the command line and not within other functions. And functions can be nested only one level, but there can be multiple nested functions.

MATLAB: How do write a function within the same main code

Put all of this into one M-file. Then call it like this: get_sub(5)

function [OUT] = get_sub(A)
OUT = subfun(A);  % Call the subfunction.
function [OUT_SUB] = subfun(B)
OUT_SUB = B.^2;

Best Answer

Related Solutions

MATLAB: What does this error means-“Function definitions are not permitted at the prompt or in scripts.”

MATLAB: How do write a function within the same main code

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