Variable is changing when being read into a function

I am passing a number into a function, but when it is read into the function it seems to have been changed. so something like this:

...

x = somefunction(5);

function [x] = somefunction(num)

whos num ...

...

and it returns:

Name Size Bytes Class Attributes

num 1x2361 18888 double

This is causing the whole program to crash. If I say "clear num" at the beginning of the function and then reset it within the function, it works fine. I feel like there is an obvious answer of what is happening wrong here, but I cannot find it. Thanks for any help.

[per isakson]

MATLAB doesn't behave like that. You provide too little information.

Answer 1

[Andreas Goser]

Indeed, there is not enough information for a real answer. Some ideas:

1. Somewhere between

function [x] = somefunction(num)

and

whos num ...

num is altered.

2. num is somehow used a global or similar and there are conflicts. Try

which num -all

to find out more.

3. The size of 1x2361 should give you a hint. What in your application has this size and maybe this leads you to the problem.

If this all fails - reproducible code examples will help.