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Natural number determination

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Rafael Freire
Rafael Freire 2011-7-28
回答： Sang Eun Lee 2016-5-16
In a vector how a determinate if the values is a natural number or not A=[ 1 2.2 3 5 6 8.8 9.6 ]

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the cyclist
the cyclist 2011-7-28
A == round(A)
That will give a 1 for integers. You can add a test for positiveness if you want it.
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Oleg Komarov
Oleg Komarov 2011-7-28
@Matt you're a troll!!! :)
Matt Tearle
Matt Tearle 2011-7-28
I prefer "evil genius"
(BTW, ismember(A,1:max(A)) actually works quite well, as long as max(A) is not too large...)

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更多回答（2 个）

Sang Eun Lee
Sang Eun Lee 2016-5-16
Hello I'm stuendt of Chung Nam National University in Korea. I'm very impressed of your command and I use it very usefully. Thanks A lot
Walter Roberson
Walter Roberson 2011-7-28
You can also check whether A>0 and mod(A,1) is non-zero .
The methods so far all suffer from loss of precision as the numbers increase, being only able to work with the nearest IEEE 754 double-precision representation to the number instead of the number itself.

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