MATLAB: How to make a user defined function with the input being the file name in a string

user defined function

I want to make a user defined function where the user can just type in the file name as the input. For example, if my file is called 'graphs.csv' and my function is called power, I want to be able to do

power('graphs.csv') and for the function to run. How do I make this as my input?

Best Answer

Sure, this is easy (do NOT use the name power, as this is already used by MATLAB):

function myfun(filename)
data = csvread(filename);
...
end

and call it like this:

myfun('graphs.csv')

How to define functions is clearly explained in the function help.

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MATLAB: How to create a “function function”? How do you make a function that accepts another arbitrary function as an input argument

'... a special type of function in MATLAB called a "function function".'

There is nothing special about a function that accepts a function handle as an input.

'How do you make a function that accepts another arbitrary function as an input argument?'

A function handle is a fundamental MATLAB data type, so they can be passed just like any other data type. Simply define your function with an input argument, and inside that function you can call that input argument as a function. For example:

function myfun(infun)
x = 0:0.1:pi;
y = infun(x);
plot(x,y)
end

and then call it with a function handle:

myfun(@sin)

A function handle is just like any other variable, you can pass it, allocated it to another variable, etc.:

f = @sin
g = f;
g(pi)

MATLAB: Does the MFILENAME function fail to work with EVALIN in MATLAB 7.0.4 (R14SP2)

This is expected behavior in MATLAB. The MFILENAME function returns a string containing the name of the most recently invoked MATLAB script or function, which is the same regardless of the workspace. Calling MFILENAME in different workspaces does not affect the output of the function.

To obtain the name of the function that calls the current function, use the DBSTACK function.

For information about the DBSTACK function, refer to the documentation by typing the following command in MATLAB:

doc dbstack

Best Answer

Related Solutions

MATLAB: How to create a “function function”? How do you make a function that accepts another arbitrary function as an input argument

MATLAB: Does the MFILENAME function fail to work with EVALIN in MATLAB 7.0.4 (R14SP2)

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