I want to pick a random number that is -1<x<1, but if I use Math.random, it is only -1<=x<1.
How do I get a random number in this range?
double x = (Math.random*2)-1
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"but if I use Math.random, it is only -1<=x<1." `0 <= x < 1`, surely? – Andy Turner Apr 30 '21 at 14:09
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OP has already solved "how to generate random numbers within a specific range". This question is about how to exclude endpoints. Not a great dup imo. – Silvio Mayolo Apr 30 '21 at 14:10
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Just discard -1 when (if) you get it? – Rocco Apr 30 '21 at 14:12
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@SilvioMayolo what's not "within a specific range" about `-1 < x < 1`? – Andy Turner Apr 30 '21 at 14:13
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Generate a number in the range `0 <= x < 1`; randomly multiply that by -1 or 1. – Andy Turner Apr 30 '21 at 14:13
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@AndyTurner That gives you a higher chance of getting zero. But then, there are two zeroes in floating point, so maybe that's correct. – khelwood Apr 30 '21 at 14:14
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@khelwood OP didn't specify the distribution. – Andy Turner Apr 30 '21 at 14:15