how to change an integer to a natural number

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imene. B 2016-7-18

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评论： imene. B 2016-7-18

hi all, i have a function answer witch is an integer number, but i want to ignore the numbers after the coma and to take the natural part, how to do that ?

Thanks.

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James Tursa 2016-7-18

Please show a specific example of the input and desired output.

imene. B 2016-7-18

thank you,

for example 8.7 , and i want just to take 8 .

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Answer 1

Walter Roberson 2016-7-18

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You need either floor() or fix() . The two differ in their handling of negative values. floor(-8.7) would be -9, and fix(-8.7) would be -8

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imene. B 2016-7-18

thank you :D ! it worked floor(8.7) gives 8 thank you !

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Answer 2

John D'Errico 2016-7-18

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编辑：John D'Errico 2016-7-18

在 MATLAB Online 中打开

An integer already IS a natural number.

https://en.wikipedia.org/wiki/Natural_number

So, WOW! You already did what you wanted.

If you are seeing multiple zeros AFTER the decimal place reported, then your number is not in fact an integer. Actually, you must have some floating point trash in there, that causes MATLAB to show those zeros.

N = 1 + eps
N =
   1.000000000000000

As you can see, MATLAB knows that it is not really exactly 1. It reports all those sparse zeros, because MATLAB see trash out there past the digits that it reports.