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 个评论
Adam
2018-6-13
Well, you define it in one case of a switch statement and then access it in a mutually exclusive one so in the state where you define it you don't use it and in the state where you try to use it you don't define it.
Sergio Quesada
2018-6-13
编辑：Sergio Quesada
2018-6-13
采纳的回答
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 个评论
Sergio Quesada
2018-6-13
As the error message says, inputs to fprintf (and sprintf) cannot be cell array. But it can have multiple inputs. So you probably want something like this:
fmt = '%d %d %d %d\r\n'
fprintf(fid,fmt, optimValues.iteration, optimValues.resnorm, x(1),x(2))
You put six items into that cell array, but only have four conversion specifiers in the format string: I leave that for you to reconcile. I recommend that you use the debugging tool (i.e. set a breakpoint) and then manually call fprintf with those variables, until you get the output that you require.
The arguments to fprintf should not be in a cell array, they should just each be their own argument as in the documentation where they are the equivalent of A1,...An
doc fprintf
Sergio Quesada
2018-6-13
编辑：Sergio Quesada
2018-6-13
Adam
2018-6-13
A is not a cell array in that case though, it is a numeric array.
Sergio Quesada
2018-6-13
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