No pre-defined input in a function

2013 4 8
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Good evening,
I'm about to do some experiments and afterwards I would like to do exactly the same data processing (graphs and such), so I figured a function would be in order. However, for convenience I would like the input of the function to be dynamic, if that is possible.
So if I input name of subject A, the function loads A's data and does calculations.
My current code is:
function experiment(subjectname)
subject.data = load(subjectname);
end
And I have a script, which does nothing at the moment but try to use the function:
experiment(subjectA)
When running the script, I get the following error: "Undefined variable "subjectA" or function "experiment""
Both the experiment.m and subjectA.mat are in my MATLAB directory.

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Image Analyst
Image Analyst 2013-4-8

0 个投票

You need to pass in the filename as a string.
baseFileName = 'subjectA.mat';
% folder might be pwd or whatever....
fullFileName = fullfile(folder, baseFileName);
if exist(fullFileName, 'file')
% File exists, use it
experiment(fullFileName);
else
% File doesn't exist - alert user.
errorMessage = sprintf('Warning: file not found:\n%s', fullFileName);
uiwait(warndlg(errorMessage));
end

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Tobias
Tobias 2013-4-8
So instead of changing my input for the function, I change:
baseFileName = 'subjectA.mat';
to
baseFileName = 'subjectB.mat';
And this change would affect fullFileName and thereby the experiment function and the data processing which are being done?
Image Analyst
Image Analyst 2013-4-8
Yes. You can make it whatever you want. You can use uigetfile() if you want, or even use sprintf:
for k = 'A' : 'Z'
baseFileName = sprintf('subject%c.mat', k)
end
Tobias
Tobias 2013-4-8
Alright, I will try to implement that next time I have time to sit down with Matlab. I appreciate your feedback!
Tobias
Tobias 2013-4-10
There must have been a misunderstanding somewhere in our communication. The code works nearly perfect, but rather than using the workspace values I have saved in subjectA.mat, it simply creates a variable baseFileName which equals the raw text "subjectA.mat" ..
Say subjectA.mat contains a 3 x 2 matrix - is there anyway I can make baseFileName load that data and not just the filename itself?
Image Analyst
Image Analyst 2013-4-10
Your function opens the mat file and reads the contents. What you're missing is to pass it back
function subject = experiment(subjectname)
or to load it into a global variable with setappdata() or the global keyword.

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