MATLAB: Saving variables contained within a function

function

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'?

Best Answer

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

Related Solutions

MATLAB: Using fprintf to print in text file

Hey Sung,

Instead of printing a fixed number of spaces with ' ', you may set the total width of your value in the format string like this:

sprintf('%10.2f %10.2f', 120, 120) %Each value of 120 is displayed with total width 10 and precision 2.

Use '%w.2f' to set the width of the display value to 'w', which would fill in empty spaces as required.

This would align values in a column on the rightmost digit.

[I used 'w' to illustrate only. You can't use a variable this way, you will need to replace 'w' with your required number, say '%15.2f' or '%20.2f']

[sprintf and fprintf both work the same way, I used sprintf just to demonstrate]

Hope it helps!

MATLAB: Way to output a matrix or dat file

I am not sure if csvwrite will work with strings. You may need to use xlswrite instead, or you could try to create your own customized function using fprintf. For example:

   function myFileExport(filename,A)
       csv = fopen(filename,'w');
       fprintf(csv, ... );
       fprintf(csv, ... );
       ...
       fclose(csv);
   end