Plotting disp-x relative to the bottom

FLAC
1

How do I define an extra variable in FLAC v9 so I can plot x‑displacement relative to the base of the model? In FLAC v8 I used something like:
ex_30($iev, $jev) = xdisp($iev, $jev) - xdisp($iev, 1)
What’s the equivalent way to set this up in FLAC v9? It seems like the zone.displacement-x is not a defined syntax in FISH

2

check this post, you can set this up similar:

3

Below is an example using a FISH function:

fish define substract_base_disp(base_group_name)
    local list_base_gp = list(gp.list)(gp.isgroup(::gp.list,base_group_name))
    local sum_base_disp = list.sum(gp.disp(::list_base_gp))
    local size_base_gp = list.size(list_base_gp)
    local ave_base_disp = sum_base_disp / size_base_gp
    gp.disp(::gp.list) ::= gp.disp(::gp.list) - ave_base_disp
end
[substract_base_disp('bottom')]
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