Thank you very much, Hauke!
Bo

    Den onsdag den 13. maj 2020 10.52.03 CEST skrev Hauke Rehr 
<[email protected]>:  
 
 Sorry, I accidentally deleted part of the mail
the “where and why” part is mostly lost.
it also dealt with using /~ and
why it’s no use in this case
(monadic/dyadic meanings of ~);
and the function definition is lost, too.
I’ll only repeat that one:

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

I recommend looking up ~ as well

Am 13.05.20 um 10:35 schrieb Hauke Rehr:
> 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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