# Matlab window example broken
**URL:** https://mworks.discourse.group/t/matlab-window-example-broken/571
**Category:** Support
**Created:** [July 16, 2014, 6:33pm UTC](https://mworks.discourse.group/t/matlab-window-example-broken/571 "2014-07-16T18:33:05Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@cstawarz](https://mworks.discourse.group/u/cstawarz)
#### Post date: [July 16, 2014, 6:33pm UTC](https://mworks.discourse.group/t/matlab-window-example-broken/571/1 "2014-07-16T18:33:05Z")
This is minor. I was just doing the Matlab window tutorial and got the following error:
> > Error: Integers can only be combined with integers of the same class, or scalar doubles. (MATLAB:mixedClasses)
> > In linspace.m at 30
> > In hist.m at 94
> > In matlab\_window\_demo.m at 22
I figured out there are two reasons for this error: First, MWorks is making rand\_var an int64 (or that’s how Matlab is seeing it at least). This still happens even if I define rand\_var as an integer. I have to use MWorks’ rand() if I want Matlab to get doubles. This is a problem because the default bin centers for Matlab’s hist() aren’t integers, which causes the error. However, setting the bin centers to integers (1:10), I get a different error:
> > Error: First Input type not supported (MATLAB:histc:InvalidFirstNumericInput)
> > In hist.m at 119
> > In matlab\_window\_demo.m at 22
Apparently hist() doesn’t like int64 objects at all. So there are two solutions, ignoring the option of changing disc\_rand() to rand() in the .xml file:
1. Have the m-file recast to a double or an integer type that the function you want to use likes.
2. Figure out a way to get MWorks to output a variable as a double even if the values are all (mathematically) integers.
I have no idea how difficult it would be to do #2, and it might break current functionality, so I’m guessing #1 is the better of the two.
---
### Author:  [@cstawarz](https://mworks.discourse.group/u/cstawarz)
#### Post date: [July 17, 2014, 7:56pm UTC](https://mworks.discourse.group/t/matlab-window-example-broken/571/2 "2014-07-17T19:56:37Z")
Hi Evan,
Thanks for reporting this. I made the change that introduced this issue quite a while ago, but I failed to update the tutorial.
Luckily, this problem is easy to fix. To fix it in the .m file, replace
```
hist(values);
```
with
```
hist(cast(values, 'double'));
```
To fix it in the .xml file, replace
```
disc_rand(1, 10)
```
with
```
(double)disc_rand(1, 10)
```
I prefer and recommend the first option, so I’ve posted an updated version of the .m file to the tutorial.
Cheers,
Chris
---
### Author:  [@cstawarz](https://mworks.discourse.group/u/cstawarz)
#### Post date: [July 19, 2022, 10:58pm UTC](https://mworks.discourse.group/t/matlab-window-example-broken/571/3 "2022-07-19T22:58:28Z")