Variable not found in parfor loop

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JohnDylon
JohnDylon am 20 Jan. 2017
Kommentiert: JohnDylon am 22 Jan. 2017
If I run the script:
z=1:1000;
parfor i=1:numel(z)
zfun(z(i))
end
which calls the function:
function zfun(z)
for j=1:50
for k=1:100
myz=z*10+myz*k;
end
end
save(fullfile('filepath', num2str(myz)), 'myz');
end
I get an error of Undefined function or variable 'myz' for the save command.
Any ideas how to fix this?
  2 Kommentare
Walter Roberson
Walter Roberson am 20 Jan. 2017
Which MATLAB version?
My spidy-senses are suggesting you might be using R2015b or R2016a but not R2016b ?
JohnDylon
JohnDylon am 20 Jan. 2017
R2016b trial for Linux. (No error for 2014a on PC though!)

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Walter Roberson
Walter Roberson am 20 Jan. 2017
You do not initialize the variable in the zfun loop.
  5 Kommentare
Walter Roberson
Walter Roberson am 21 Jan. 2017
Yes, that would have less overhead. However, due to finite precision of floating point numbers, the result of the above is going to be -inf below about -1/17 and +inf above it. The zero is at about -0.058197670686932642438500200510901 . If you were trying to find the zero, it would be much more effective to use the symbolic toolbox.
JohnDylon
JohnDylon am 22 Jan. 2017
Thank you for all valuable guidance.

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