question on citing the output message of fzero function.

hi all,I have one question about fzero. Below is my sample code, where I try to set the result delta(j)=NaN if the output.message is 'Zero find terminated.'. To do this, I use strcmp, but it doesn't work because it does recognize the variable 'output.message'. what is the right way to cite the message? This annoys me a lot...

for j=1:length_gamma
     [dlt fval eflag output]=fzero(@(delt) vdiff(data,gamma(j),delt),[0 1]);
      delta(j)=dlt;
      if  strcmp('output.message','Zero find terminated.')==1
          delta(j)=NaN;
      end 
end

Answer 1

[Guang]

I got it.

use strcmp(output.message,'Zero find terminated.')==1 instead of strcmp('output.message','Zero find terminated.')==1

Answer 2

[Sean de Wolski]

One thing to test: use strcmpi so that it's not case sensitive.

[Guang]

Sean de, thanks, but it doesn't work.

My key question would be how to cite the message of the output. Is 'output.message'

a correct way to do so?

[Walter Roberson]

try output.message without the quotation marks.