Natural number determination

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 ]

Answer 1

[the cyclist]

A == round(A)

That will give a 1 for integers. You can add a test for positiveness if you want it.

[Matt Tearle]

ismember(A,1:realmax) mwahahahaha!

[Oleg Komarov]

@Matt you're a troll!!! :)

[Matt Tearle]

I prefer "evil genius"

(BTW, ismember(A,1:max(A)) actually works quite well, as long as max(A) is not too large...)

Answer 2

[Sang Eun Lee]

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

Answer 3

[Walter Roberson]

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.