How to create array with unequal spacing?

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Ahmad Hasnain
Ahmad Hasnain 2018-2-21
评论： Walter Roberson 2018-2-22
I want to create an array with unequal spacing. I have h = 1 1/2 1/4 1/8 ..... 2^-60.
Every second entry in this array is 1/2 of the last one. I only know, how to make arrays with equal spacing.
a = 1:5:40
But how do I create array that gets halved with every entry?
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Stephen23
Stephen23 2018-2-22
@Walter Roberson: Interesting. So what is the usecase for pow2(n) then?
Walter Roberson
Walter Roberson 2018-2-22
In 2.^-(0:60) the JIT is detecting that the expression is constant and optimizes it, at least in the case of re-use. If you use B = 2; B.^-(0:60) or if you use V = -(0:60); 2.^B then JIT optimization is not as good and pow2 can have better performance than those.

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Walter Roberson
Walter Roberson 2018-2-21
h = 2.^-(0:60);

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