Why does running a script cause a memory error, while running the same script as a function does not?

I have found that running a script as a script by simply calling it from the command line causes a memory error, yet, running the same script as a function does not. Does anyone know why this is the case?

[Matt J]

We can't know why immediately. You haven't shown us the script/function that proves that it is true.

[Robert]

That would be handy, but the script that generates the error is quite long (~1000 lines), I'll try to find a simpler approach that replicates the issue.

[Moe_2015]

You can attach the file here as a comment

[Arnab Sen]

Also can you post the exact error message.

[Jos (10584)]

How do you run a script as a function? Did you edit the m-file?