Did you try adding plus signs, like this?

h&         = {pmPtr&+_bounds+_bottom} - {pmPtr&+_bounds+_top}

Mark

Ian Mann wrote:

> I am using the function below in an FB^3 program I am having trouble
> figuring out the correct FB^3 syntax for the line :
>
> h&         = {pmPtr&_bounds_bottom} - {pmPtr&_bounds_top}