for to parfor, Error: The variable h in a parfor cannot be classified.

L=128
K=10
h = zeros(L, 1);
r = randperm(L, K);
parfor i = 1:K, 
   h(r(i)) = randn(1,1);
end

for to parfor, Error: The variable h in a parfor cannot be classified. How can I fix the code?

Answer 1

[Brendan Hamm]

You cannot assign to an index which depends on another variable inside a parfor loop. Instead you can assign to a temporary variable in the parfor loop and extract into the appropriate location outside of the loop:

L=128; 
K=10; 
hTemp = zeros(K, 1); 
r = randperm(L, K);
parfor k = 1:K
    hTemp(k) = randn(1,1);
end
h = zeros(L,1);
h(r) = hTemp;