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how can I create 10 different gaussian random vectors (X) and sum them, after their square elevation (Y = X1^2 + X2^2 + ... X10^2)?

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Paolo Ottonelli
Paolo Ottonelli 2016-7-11
回答： Image Analyst 2016-7-12
if true
% code
% be Y = X1^2 + X2^2 + ... XM^2
N = 10000;
M = 10;
Y=zeros(N,1);
for j=1:length(M)
X=(randn(N,1));
Y=Y(j)+X.^2;
end
end

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回答（1 个）

Image Analyst
Image Analyst 2016-7-12
Try this:
N = 10000;
M = 10;
X = randn(N, M);
XSquared = X .^ 2;
% Perhaps this is wanted:
Y = sum(XSquared, 1)
% Or maybe this is wanted:
Y = sum(XSquared(:))

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