Something like this, untested
'Valeur' (({.@] i. <@[) { |:@}.@]) data
Сб, 03 мар 2018, raoul schorer написал(а):
> Dear all,
>
> I am learning J and stumbled on something today:
>
> I loaded a .csv and obtained a boxed table, that I assigned to the name
> 'data'.
>
> The first row of 'data' looks like that:
>
> │N°IPP│Nom du paramètre│Valeur│Valeur Unit│Heure│
>
>
> Then I defined two functions, that do work as expected:
>
> NB. Column index of data y by name x
>
> colIdxByName =: 4 : 'I. (0 { y) = <x'
>
>
> NB. Select a column in data y by index x
>
> colByIdx =: 4 : '}.x{|:y'
>
>
> But if I try:
>
> colByName =: 4 : 0
>
> idx =. x colIdxByName y
>
> res =. idx colByIdx y
>
> )
>
> 'Valeur' colByName data NB. nothing happens...
>
> idx =: 'Valeur' colIdxByName data
>
> idx colByIdx data NB. this doesn't work
>
> 2 colByIdx data NB. but this does...
>
>
> How can I elegantly compose colIdxByName and colByIdx ?
>
>
> Cheers,
>
> Raoul
>
>
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--
regards,
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