[jitter] Bug in jit.rota inside jit.expr

On Jul 1, 2007, at 6:12 PM, Jean-François Charles wrote:

> Summary:
> "• error: jit.expr: null matrix in jit_expr_treecalc" error message  
> when
> theta < 0, when jit.rota is used as a functor from within [jit.expr].
>
> Steps to Reproduce:
> -open the patch
> -read a jpg
> -bang the jit.qt.movie
> -try a positive value for theta, that works
> -try a negative value, see the error message and the incorrect result


Unfortunately with jit.expr for negative attribute values, the  
negative value needs to be in parentheses(e.g. @theta (-value)) to  
ensure that the parser doesn't think it's @theta - value.

-Joshua