jit.expr evaluate expressions of matrix operators, functors, and other jitter objects The jit.expr object evaluates expressions to fill an output matrix. The expression can contain any operator available from within jit.op, any functor available from within jit.bfg, and many jitter MOPs.	from the library : Jitter 1.5 Format : External Environment : jitter / max commercial Max 4.5 http://www.cycling74.com