loop over x,y,z in user defined function (opengrads)

[Ming Pan]

Dear Users/Developers,

I'm using grads-2.0.a7.oga.3 and trying to write a customized function
to compute low-level cape. In this case, I need to loop over 3
dimension x, y, and z, but it seems the current udf interface only
allows passing 2-D grids (isiz, jsiz). Anyone ran into a similar
situation and came up with a solution/work-around?

Thanks!

ming