fprintf in an OutPutFcn

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Hi everybody, I'm trying to edit this output function within the command fopen and fprintf:
function stop=outfun(x,optimValues,state)
stop = false;
switch state
case 'init'
fID2=fopen(['I_vs_texp--',datestr(now,'dd_mm_yyyy_HH_MM_SS') '.txt'],'a');
case 'iter'
fprintf(fID2,'%6.2f %12.8f\r\n',{optimValues.iteration, optimValues.resnorm, x(1),x(2),x(3)});
case 'done'
fclose ('all')
end
, but something must be wrong with the name given to the new file, because it gives me the following:
Undefined function or variable 'fID2'.
Thanks !!
  2 Comments
Sergio Quesada
Sergio Quesada on 13 Jun 2018
But if i define it on the 'init' statement, it will create one different file after each iterarion...

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Accepted Answer

Stephen23
Stephen23 on 13 Jun 2018
Edited: Stephen23 on 13 Jun 2018
Add this line at the start of the function:
persistent FiD2
Each time the function is called it has no recollection of what happened last time it was called, unless you explicitly give it some way to remember: that is exactly what persistent is for, so that the next time the function is called, it will remember that variable. Note that in general it is a bad practice to call fclose('all') like that, except perhaps from the command line.
function stop=outfun(x,optimValues,state)
persistent fid
stop = false;
switch state
case 'init'
tmp = datestr(now,'dd_mm_yyyy_HH_MM_SS');
tmp = sprintf('I_vs_texp--%s.txt',tmp);
fid = fopen(tmp,'a');
case 'iter'
fprintf(fid,'%6.2f %12.8f\r\n',{optimValues.iteration, optimValues.resnorm, x(1),x(2),x(3)});
case 'done'
fclose(fid)
end
  6 Comments
Sergio Quesada
Sergio Quesada on 13 Jun 2018
oh, ok. Thanks!

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