How to create array with unequal spacing?

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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?
Walter Roberson
Walter Roberson on 22 Feb 2018
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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