making new expressions

[grastro]

Hi every body. I'm new at using visit. I'm going to produce new expressions. I need to use two output files one of which is in .xmf format while another one is in .h5 format. E. g. I wanna use U1U2U3gdet[3] variable (which is the third component of 3 vector U1U2U3gdet, so it should be scalar) from .xmf file and divide it by gdet (as another scalar) from .h5 output file. when I want to plot it through pseodocolor tab, it prompts an error: "Pseudocolor: ()
viewer: An invalid variable (gdet) was specified."
How I can make this new expression work??

[markcmiller86]

Is this happening in VisIt 3.4.1 on a mac with Apple silicon?

[grastro]

It is VisIt 3.4.1 on ubuntu 24.04.

[grastro]

Hi every body. I'm new at using visit. I'm going to produce new expressions. I need to use two output files one of which is in .xmf format while another one is in .h5 format. E. g. I wanna use U1U2U3gdet[3] variable (which is the third component of 3 vector U1U2U3gdet, so it should be scalar) from .xmf file and divide it by gdet (as another scalar) from .h5 output file. when I want to plot it through pseodocolor tab, it prompts an error: "Pseudocolor: () viewer: An invalid variable (gdet) was specified." How I can make this new expression work??

is it more smooth to plot such expressions through python scripting using VisIt? if yes, is there any sample script that can help me for this case?