What is the best practice for inserting an element into an array at an arbitrary position in J?
I guess this is sort of a double question: my main issue is figuring out how to provide three arguments to the verb I want to create. The gist of the code that I want to write is
insert =. dyad : '(n {. y) , x , (n }. y)'
for a position n. The best solution to this that I can think of is taking a two-length array of boxes as the right argument and the position as the left, but that seems a bit clunky
insert =. dyad : 0
NB. the array to be inserted is the first argument
i =. > {. y
NB. the original array is the second argument
a =. > {: y
(x {. a) , i , (x }. a)
)
EDIT: Furthermore, would it be possible to take an array of indices to insert the item at and an array of items to be inserted at those indices -- i.e. inserting multiple items at a time? It seems to me like this is something J would be good at, but I'm not sure how it would be done.