saving variables contained within a function
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I need to save variables that are computed inside a function (called from a header) without providing them as output parameters. I can't use 'save' because the function is called inside a loop and it overwrites (the variables computed change over time). Is the only way to accomplish this through 'fprintf'?
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Accepted Answer
Rick Rosson
on 28 Jun 2011
It is probably not the only way to accomplish this task, but it will certainly work.
You can use fprintf to print to a text file instead of to the command window. Please check the documentation:
doc fopen
doc fclose
doc fprintf
The code would be something like:
filename = 'data.txt';
txt = fopen(filename,'w')
...
...
for ...
...
fprintf(txt, '...\n' , ...);
...
end
...
...
fclose(txt);
...
...
HTH.
Rick
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More Answers (2)
Rick Rosson
on 28 Jun 2011
Another approach would be to declare a persistent variable that will accumulate the results each time you call the function, and then perhaps write the results out to a MAT file the last time you call the function.
Please check the documentation:
doc persistent
The function template would be:
function y = foo(x)
persistent results
if isempty(results)
results = zeros(...);
end
...
...
end
HTH.
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