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No pre-defined input in a function

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Tobias
Tobias el 8 de Abr. de 2013
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.

Respuesta aceptada

Image Analyst
Image Analyst el 8 de Abr. de 2013
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
  5 comentarios
Tobias
Tobias el 10 de Abr. de 2013
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 el 10 de Abr. de 2013
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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