How do I make a user defined function with the input being the file name in a string?

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?

[Stephen23]

Do NOT use the name power, as this is the name of the very important inbuilt power operation!

[dpb]

Good catch, Stephen; I whiffed on that important detail...

Answer 1

[Stephen23]

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.

Answer 2

[dpb]

The users will probably very quickly get very tired of having to type in a fully-qualified file name.

I'd suggest something more on the lines of

function [returns?]=power
  fn=uigetfile;
  if fn==0, return, end
  % function does whatever with the returned filename following
  ...
end