I wanted to play around with expression columns after seeing them in demo videos, but found the info on how to create them actually quite sparse.
I want to create the same sample data set as in Expand Vector Column Addin (TestVec.jmp), by hand (and maybe JSL if nothing else works).
My trouble is that I cannot insert the [] shown - they disappear when typing and JMP adds the quotes "".
![Feli_1-1634201105411.png Feli_1-1634201105411.png](https://community.jmp.com/t5/image/serverpage/image-id/36559i5FEF8067C80F9049/image-size/medium?v=v2&px=400)
Any hints on how to create expression coumns (and especially expression vector columns)?