valid indices for 'output' are restricted in parfor loop

Hi,

i have the following code:

for j= 1:100
    SNR =  list(j);
parfor i = 1:1000
    tot = (j-1)*1000+i;
    totallist(tot,1) = SNR;
    output(tot,1) = awgn(input(tot,1),SNR);
end
end

tot is just the total counter of the full loop

so the full loop contains 100*1000 values.

But why is the output(tot,1) and totallist(tot,1) forbidden?

How can i do it on another way?

Answer 1

[Walter Roberson]

for j= 1:100
    SNR =  list(j);
    base = (j-1)*1000;
    parfor i = 1:1000
        totallist(base+i,1) = SNR;
        output(base+i,1) = awgn(input(base+i,1),SNR);
    end
end

https://www.mathworks.com/help/parallel-computing/sliced-variable.html

"Form of Indexing. Within the first-level of indexing for a sliced variable, exactly one indexing expression is of the form i, i+k, i-k, or k+i. The index i is the loop variable and k is a scalar integer constant or a simple (non-indexed) broadcast variable. Every other indexing expression is a positive integer constant, a simple (non-indexed) broadcast variable, a nested for-loop index variable, colon, or end."

[soepblik]

ahh thanks for the clear explanation! It is working now