I already have a row matrix, how to change it's dimensions to 5x5 for example?

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Francisco Boudagh
Francisco Boudagh 2021-4-26
评论： Francisco Boudagh 2021-4-26
So this is how it is right now. My matrix A = num(idx) is a row matrix. How can I change it's dimensions to 5x5?
  2 个评论
Matt J
Matt J 2021-4-26
编辑：Matt J 2021-4-26
Ran in:
Please post code in code wells llike below, rather than as screenshots.
num=1:100;
A=num(isprime(num))
A = 1×25
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
Aside from that, your matrix contains only 25 elements, so how would you populate the other 75 elements of a 10x10 matrix?
Francisco Boudagh
Francisco Boudagh 2021-4-26
Right, but lets edit and say 25 numbers. How to make 5x5 matrix of that (instead of row matrix)?

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采纳的回答

Walter Roberson
Walter Roberson 2021-4-26
Ran in:
It looks like you are not being asked to draw the primes between 1 and 100; it looks like you are asked to draw the first 100 primes.
num = 1:600;
idx = isprime(num);
A = num(idx);
if length(A) > 100; A = A(1:100); end
A = reshape(A, 10, 10);
imagesc(A)
colorbar
axis equal tight;
A(end)
ans = 541
However, there is a completely different possibility:
num = reshape(1 : 100, 10, 10);
idx = isprime(num);
imagesc(idx)

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