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A self assignment from scalar product

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Damiano Capocci
Damiano Capocci 2018-1-17
编辑： Damiano Capocci 2018-1-17
Hi there, i want to have a variable x which is involved in a scalar product with another vector but the result becomes an element of x itself. I 've tried this code ( I DON'T WANT TO USE FOR LOOP ):
x=ones([1,20]);
j=primes(100);
j=j(20);
a=1:20;
x(a+1)=x*j(randperm(20))'
But the result is :
x =
1 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
It seems the product operation is executed before the assignament. How should I do?

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