# How to fix index in a parfoor loop?

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Andreu Angles Castillo il 13 Set 2018
I have the following code and get indexing error
parfor dt=0:round(tmax/step)
fprintf(1,'\b\b\b\b\b%05.2f',dt);
for dm=0:dt
A(dm+1,dt+1) = f(dm,dt);
end
end
It does not make sense, for me, because each loop of the first for is stand alone in the variable dt. The size of A has been prefixed.
The error messages on the script are:
-The PARFOOR loop cannot run due to the way varaiable 'A' is used. (On line 1)
-Valid indices for 'A' are resticted in PARFOR loops. (On line 4)
Error when run:
Error: The variable A in a parfor cannot be classified. See Parallel for Loops in MATLAB, "Overview".
##### 4 CommentiMostra 2 commenti meno recentiNascondi 2 commenti meno recenti
Stephen23 il 13 Set 2018

@Andreu Angles Castillo: please give the complete error message. This means all of the red text.

Andreu Angles Castillo il 14 Set 2018
Modificato: Andreu Angles Castillo il 14 Set 2018

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### Risposta accettata

Titus Edelhofer il 14 Set 2018
Hi Andreu,
agreed, it looks as if this case could be handled. But it is fairly easy to work around this by separating the inner loop from the parfor loop:
n = round(tmax/step) + 1;
parfor dt=0:round(tmax/step)
fprintf(1,'\b\b\b\b\b%05.2f',dt);
col = zeros(n, 1);
for dm=0:dt
col(dm+1) = f(dm, dt);
end
A(:, dt+1) = col;
end
Titus
##### 1 CommentoMostra -1 commenti meno recentiNascondi -1 commenti meno recenti
Andreu Angles Castillo il 18 Set 2018
Thank you very much, it worked for me.

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