# Division int32 numbers in MATLAB R2019b

3 views (last 30 days)
vadim onuchin on 27 Oct 2020
Commented: Steven Lord on 27 Oct 2020
Let's see some examples:
first:
1140 / 32
ans =
35.6250
second:
int32(1140) / int32(32)
ans =
int32
36
third:
int32(1140 / 32)
ans =
int32
36
So, why division with int32 numbers is not equivalent like in C++?

vadim onuchin on 27 Oct 2020
Edited: vadim onuchin on 27 Oct 2020
So, I found solution.
Need to use special division:
idivide(int32(1140), int32(32))
ans =
int32
35

Bruno Luong on 27 Oct 2020
Just wonder what is the risk to overload integer "/" with idivide?
Beside Image Proceesing toolbox where else does MATLAB stock uses integers?
Steven Lord on 27 Oct 2020
FYI the way MATLAB performs arithmetic on integers is documented here.

Cris LaPierre on 27 Oct 2020
Edited: Cris LaPierre on 27 Oct 2020
int32 is for storing 32-bit integers. The result of the division is rounded to the closest integer value.
int32(32.5)
ans = int32 33
If you want to control how the rounding is handled, use idivide.

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