Nim-lang: list comprehension with two variables

user_9255360 0
Viewed 478

Confused on how to perform a list comprehension using two variables.

Here's what i'm trying to do so far:

let profile_row = lc[profile[r][c] | ( r <- 0..<4, c <- 0..<k ), int]

Here's the error:

greedy_motif_ba2d.nim(22, 40) Error: type mismatch: got <seq[int], float>

How is this correctly done?

nim-lang
2 Answers

Turns out that the way I did it does actually work, just needed to change the type.

let profile_row = lc[profile[r][c] | ( r <- 0..<4, c <- 0..<k ), float]
user_92553600

Since Nim 1.2 lc has been removed so here's how to do this for anyone searching today:

let profile_row = collect(newSeq):
  for r in 0..<4:
    for c in 0..<4:
      profile[r][c]

note collect removes the need to specify the type of of profile[r][c] but requires you to supply an initialization proc for the container profile_row

user_132176240
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