How can I apply ndgrid in loop?
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Hi, I have three matrices A=[60x111], B=[60,11],C=[60,101];
here, N=60, a=111,b=11,c=101
for i=i:N
[Nd{:,i}] = ndgrid(1:a, 1:b, 1:c);
end
I want to use Nd{:,i} for each row of A,B,C. My output will be a 4 dim matrix (111x11x101x60) obtaind from final multiplication of
A(Nd{:i}).*B(Nd{:i}).*C(Nd{:i}). I dont know how to do that.
Thanks in advance.
2 Comments
Guillaume
on 31 Jul 2019
I'm not clear on what you're trying to do. Currently your loop just does the same calculation 60 times.
Can you provide a example of inputs and desired output, with smaller size matrices (e.g. N = 3, a = 2, b = 3, c = 4)?
Accepted Answer
Guillaume
on 31 Jul 2019
It's not any clearer what you want, since you don't define what you mean by multiply and since ndgrid has nothing to do with multiplication.
Perhaps, you're looking for this:
result = A .* permute(B, [1, 3, 2]) .* permute(C, [1, 3, 4, 2])
which will give you 4D matrix of M x N x P x Q for A of size M x N, B of size M x P and C of size M x Q.
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