Problem with mod and the value 2.3 times 100

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Katsmeat
Katsmeat 2015-6-14
回答： Walter Roberson 2015-6-14
There seems to be some kind of overflow problem with mod, which occurs on all the Matlab versions I have access to - 2007a, 2010a and 2014b.
> format long
> mod(2.3*100,10)
> 9.999999999999972
mod(230,10) is fine and gives the right value, zero, but
> qqq=2.3*100
> mod(qqq,10)
Also misbehaves. However
> qqq=2.3*10*10
> mod(qqq,10)
Is fine and does give a result of zero. I'm confused. I was going to submit a bug report, but it seems odd that a bug so easily found could be hanging around for so long. Could somebody offer some insight as to what's going on?

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Walter Roberson
Walter Roberson 2015-6-14

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