Vectorization of 3 nested for loops.

I have 3 for loop and I want to vectorized it .

I try a lot to do it but I cannot do it.

This is the simple version.

I can't explain the whole situation but:

A is 100*82.

B is 203*2000.

C is 1*10.

D is 100*5*2000.

for nset=1:100
    for nindy=1:5
        for nimp=1:2000
if A(nset,2+(nindy-1).*3)==1
    if B(33.*6+nindy,nimp)<= C(1+(nindy-1).*2)+...
        ((C(2+(nindy-1).*2)-C(1+(nindy-1).*2))./11).*A(nset,1+(nindy-1).*3)

         D(nset,nindy,nimp)=1;
      end
  end

         end
      end
  end

I want to replace the 3 for loops with vectorization...

Thanks....

Answer 1

[per isakson]

I don't think that your code can be vectorized. However, this should be a bit faster

for nset=1:100
    for nindy=1:5
        if A(nset,2+(nindy-1).*3)==1
            C17 = C(1+(nindy-1).*2)        ...
                + ((C(2+(nindy-1).*2)-C(1+(nindy-1).*2))./11).*A(nset,1+(nindy-1).*3);
            for nimp=1:2000
                if B(33.*6+nindy,nimp) <= C17
                    D(nset,nindy,nimp) = 1;
                end
            end
        end
    end
end

Caveat: I have neither tested correctness nor speed.

[Emiliano Rosso]

Thanks,I tried your suggestion and time was reduced by 30% !