selecting nodes depending on their coordinates

Hello,

I'm a new user of tcl languaje and HyperMesh macros, and I have a problem selecting nodes in a tcl script.

I want to create a list with nodes depending on their coordinates. For example, I want to create a list with nodes that fulfills these conditions:

0< x < 5 && 3 < y < 6 && z == 0

(the nodes that the coordinate x have between 0 and 5, and the coordinate y between 3 and 6 and the coordinate z = 0).

Is it necessary to obtain a matrix with the coordinates x, y and z of all the nodes? How can I do that in a simple way? Is there any specific command for that?

Thanks in advance

Looking forward to for your help