How to get fsolve return number of iterations

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ttopal
ttopal 2017-1-22
评论： ttopal 2017-2-10
Hi all,
Yet another fsolve question. I am trying to compare now various root finding functions I have as well as fsolve.
In the help file it shows this;
[x,fval,exitflag,output] = fsolve(fun,x0,options)
and this
output.funcCount
so I would like to have this;
[root,output] = fsolve(myfun,x0,options);
count = output.iterations
i receive this;
Struct contents reference from a non-struct array object.
Error in zerotest (line 57)
output.iterations
What I am missing?
Thanks a lot.

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ttopal
ttopal 2017-1-22
Okay. So it turns out it needs this;
[x,fval,exitflag,output] = fsolve(fun,x0,options)
output.iterations
you have to return fval and exitflag even if you dont use them.
  2 个评论
Stephen23
Stephen23 2017-1-22
编辑：Stephen23 2017-1-22
"you have to return fval and exitflag even if you dont use them."
It is not necessary to allocate outputs if you do not want them:
[x,~,~,out] = fsolve(...);
out.iterations
https://www.mathworks.com/help/matlab/matlab_prog/ignore-function-outputs.html

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