How to extend an array to a new dimension?

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Sufayan Mulani
Sufayan Mulani on 29 Aug 2023
Answered: Star Strider on 29 Aug 2023
Suppose, I have an array
a=rand(3, 4);
I want to create a new array 'b' which has [ 3, 4, 5] size, and all 2D matrix along the third dimension are equal to 'a'.
b = zeros([size(a) 5]);
for i=1:5
b(:, :, i) = a;
end
How can I do this using MATLAB functions.

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Accepted Answer

Star Strider
Star Strider on 29 Aug 2023
Ran in:
One option is the repmat function —
a=rand(3, 4);
b = zeros([size(a) 5]);
for i=1:5
b(:, :, i) = a;
end
b
b =
b(:,:,1) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327 b(:,:,2) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327 b(:,:,3) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327 b(:,:,4) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327 b(:,:,5) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327
b2 = repmat(a, 1, 1, 5)
b2 =
b2(:,:,1) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327 b2(:,:,2) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327 b2(:,:,3) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327 b2(:,:,4) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327 b2(:,:,5) = 0.2207 0.2683 0.7580 0.4175 0.6446 0.7519 0.0339 0.4267 0.9818 0.8499 0.6944 0.9327
Both results are the same.
.

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