Hi everyone,
I have an Association in which the keys are lists. The first key might be
{20, a, b}
and the second key might be
{47, e, g}
and so on. How can I lookup or extract all values for which the first element in each key is, say, 20? I guess I'm looking for the Association equivalent of
Select[myTable, #[[1]] == 20 &]
or
GatherBy[myTable, #[[1]]&]
Regards,
Gregory
