how to change an integer to a natural number

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.

[James Tursa]

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

[imene. B]

thank you,

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

Answer 1

[Walter Roberson]

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

[imene. B]

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

Answer 2

[John D'Errico]

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.

N == 1
ans =
     0

Now lets use round.

N = round(N)
N =
     1

So, now N really, truly is an integer, a natural number. MATLAB knows that, and displays it with no trailing zeros.

N == 1
ans =
     1

[imene. B]

thank you, but what if i had for example 8.7 , and i want just to take 8 , after doing round(8.7) i got 9, do you know how to fix it ?

[John D'Errico]

floor(8.7) == 8

[imene. B]

indeed, thank you john