realmax is really real max, but is realmin really real min?
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The following is expected behavior for realmax:
>> realmax
ans =
1.797693134862316e+308
>> realmax*2
ans =
Inf
But the following is unexpected behavior for realmin (at least for me):
>> realmin
ans =
2.225073858507201e-308
>> realmin/2
ans =
1.112536929253601e-308
I keep getting representable numbers until I divide realmin by 2^53. Am I missing a subtlety in what "realmin" means?
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採用された回答
Mike Garrity
2015 年 11 月 2 日
I think that you're seeing the denorms. They allow you to get closer to 0, but at the cost of a significant dropoff in precision and performance.
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