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This was a code to get elements from set of nodes. I discovered now that the code fails for 2nd order elements because of the mid-side nodes.  Hence, wanted to identify them and avoid them in the calculation.

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I remember there is a relevant command but can't find it.

 

Example to get mid side nodes of quad8:

*createmark elems 1 "by config" quad8

set NodeList [hm_getvalue elems mark=1 datanames=nodes]

set MidNodes [join [regsub -all {\{[0-9]+ [0-9]+ [0-9]+ [0-9]+ } $NodeList \{]]

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