Or, starting from your first approach,
teaching where and why it failed:

1 2 7 ,/"1 0 ] 30 40

you want ,/ to work on a list on the left
and individual atoms on the right
" (rank) does that. It tells the verb
(,/ in this case) to apply to lists (1)
on the left and atoms (0) on the right.

Thus ,/"1 0 does it.
] in effect only separates the list argument 1 0
for " from the list argument 30 40 to ,/"1 0

look up rank (both the concept and the verb ")


hth


Am 13.05.20 um 10:27 schrieb 'Bo Jacoby' via Programming:
  Thank you very much, Esa!
Bo.    Den onsdag den 13. maj 2020 10.18.27 CEST skrev Lippu Esa 
<[email protected]>:
Hello Bo,

Is this what you need?

f=:,"_ 0
1 2 7 f 30 40
1 2 7 30
1 2 7 40

Esa
-----Original Message-----
From: Programming <[email protected]> On Behalf Of 'Bo 
Jacoby' via Programming
Sent: Wednesday, May 13, 2020 11:11 AM
To: Programming Forum <[email protected]>
Subject: [Jprogramming] Please help

How to define a function f such that
   1 2 7 f 30 40
1 2 7 30

1 2 7 40



(,/~  does not work like that.)

Please help. Thanks!
Bo.
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