No pre-defined input in a function

Question

Tobias 2013-4-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/71133-no-pre-defined-input-in-a-function

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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Answer 1

Image Analyst 2013-4-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/71133-no-pre-defined-input-in-a-function#answer_81544

在 MATLAB Online 中打开

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 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?