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Manipulate Matrix Element using subscripts (ex: isprime(i-j)) or (i+j)>10)

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Mark
Mark 2011-11-22
I need to create a oneline command to set a 'n x n' matrix to {1 if i-j isprime, 0 if not). I don't remember how to select an element in this manor. Thank you.

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Fangjun Jiang
Fangjun Jiang 2011-11-22
n=10;
A=zeros(n);
A(isprime(abs(bsxfun(@minus,(1:n)',1:n))))=1

更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2011-11-22
n = 10
out = bsxfun(@(x,y)isprime(abs(x-y)),1:n,(1:n)')

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