For some reason I have a blind spot with amend.
I have the following problem:
a is a list of integer values
i is a list of indices into a, possibly with repeats
v is a list of values of the same length as i
For each value,index pair, I want to insert the value at the index in
a copy of a, and assemble the results. If it helps, index { a is
zero. I also want this to be as fast as possible (it is an inner loop
in my solution to the Meteor problem).
For example, if
a=:0 1 0 2 0 3
i=:2 2 4 0
v=:4 5 6 7
I want the result to be
0 1 4 2 0 3
0 1 5 2 0 3
0 1 0 2 6 3
7 1 0 2 0 3
Any suggestions would be appreciated.
Best wishes,
John
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