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2176 :: 2D sequence

• nyl (orginal) [2016-04-03T19:40:57+02:00] view original

  import sequtils
  
  var seq2D = newSeqWith(20, newSeq[bool](10))
  seq2D[0][0] = true
  seq2D[1][0] = true
  seq2D[0][1] = true
  
  import math
  var seqRand = newSeqWith(20, random(10))
  echo seqRand
  
  Run

  can I use the ADD command to this seq?

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• Stefan_Salewski (orginal) [2016-04-03T20:57:09+02:00] view original

  seq2D.add(newSeq[bool](13))
  seq2D[20].add(true)
  echo seq2D[20][13]
  Run

  So the answer seems to be YES:

  Please note, that is really not a very smart question: Some code copied verbatim from Nim docs, without a real description of your problem.

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• nyl (orginal) [2016-04-03T22:20:23+02:00] view original

  var seq2D = newSeqWith(2, newSeq[int](5))
  
  echo "seq2D: ", seq2D
    --> seq2D: @[@[0, 0, 0, 0, 0], @[0, 0, 0, 0, 0]]*
  
  seq2D[0].add 111
  seq2D[0].add 222
  seq2D[0].add 333
  
  seq2D[1].add 123
  seq2D[1].add 841
  seq2D[1].add 988
  
  echo "seq2D: ", seq2D
    --> seq2D: @[@[0, 0, 0, 0, 0, 111, 222, 333], @[0, 0, 0, 0, 0, 123, 841, 988]]*
  
  Run

  in the example above both dimensions are int. can I have one dimension as BOOL and one as INT so i can do something like:

  seq2D[0].add true
  seq2D[0].add false
  seq2D[0].add true
  
  seq2D[1].add 123
  seq2D[1].add 841
  seq2D[1].add 988
  Run

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• Stefan_Salewski (orginal) [2016-04-03T22:47:24+02:00] view original

  No, I think that can not work. In Nim arrays and sequences can generally contain only data of one single type. For bool and int that should be not really a problem, you can encode true and false with 0 and 1 for example, you may use true.ord and false.ord or use a converter. (In languages like Ruby or Python the array elements are references to objects, so we can mix different data types. But in C or Nim an array of ints contains the int value types directly.) Maybe there are other ways to solve your problems, unions may work, but I have no experience with that. Generally it may be smarter to say what you really intent and ask how you can do that with Nim.

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• nyl (orginal) [2016-04-03T23:10:42+02:00] view original

  thanks

  I set multiple dim. arrays like this:

  array[1..10, array[1..5, array[1..2, int]]]
  Run

  how do I declare multidimensional sequences ? (more then 2)

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• LeuGim (orginal) [2016-04-03T23:28:13+02:00] view original

  var s: seq[seq[seq[int]]] s = @[] s.add @[] s[0].add @[] s[0][0].add 5 echo s[0][0][0]

  Run

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