I have 32x32 matrix...But I want to make this a 512x512 matrix with the same element as in the 32x32 matrix..and the rest of which would be zero in 512x512 matrix.. how do i do it??

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Sanik
Sanik 2014-12-18
评论： Image Analyst 2015-1-3
I have 32x32 matrix...But I want to make this a 512x512 matrix with the same element as in the 32x32 matrix..and the rest of which would be zero in 512x512 matrix.. how do i do it??

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Stephen23
Stephen23 2014-12-18
编辑：Stephen23 2014-12-20
There is no need to waste time or space with loops or even copying the data from one matrix to another. Try this instead:
A = rand(32);
A(512,512) = 0;
The first line creates a matrix of size 32x32, the second line allocates the value zero to the element at position (512,512). Of course there is no such element, so MATLAB enlarges the matrix, and automatically fills all of the missing values with zero.

更多回答（1 个）

Sudharsana Iyengar
Sudharsana Iyengar 2014-12-18
A=32x32 matrix
B=zeros(512)
for i= 1:32
for j=1:32
B(i,j)=A(i,j)
end
end
try this
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Image Analyst
Image Analyst 2014-12-20
编辑：Image Analyst 2014-12-20
sanik's "Answer" moved here:
Thank you so much...I just now tried this one:
B=zeros(512);
A=32x32;
B(1:32,1:32,:)=A;
and yea this is working too. Thanks...
Image Analyst
Image Analyst 2015-1-3
I accepted Stephen's answer for you, since this was his idea. But I agree with him that the "trick" he used in his answer is preferable, though a little less explicit and obvious. Please give him reputation points by voting for his answer.

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