Questions tagged [j]

J is a high-level, general-purpose, high-performance array programming language.

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Parsing fixed-width format with J

I have a fixed-width input format. The widths are known to me. Suppose I am told that the first field is 20 characters, the second is 10, the third is 12. The total width of a row should therefore be ...
4
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1answer
426 views

Mars Rover problem in J

I've written an implementation of the "famous" Mars Rover simulation, (another question on this) whose problem statement is this: The first line of input is the upper-right coordinates of the ...
4
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1answer
83 views

A clean tacit version of (n choose k) in J

Listing all \$\binom{n}{k}\$ combinations of i is a well-solved problem in J. From that article, there is this implementation: ...
1
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1answer
63 views

ASCII triangle in J

I've been doing code golf puzzles to improve my J. I'd appreciate any feedback on my solution to this problem. The task is to take an integer and produce an ascii triangle as follows: ...
6
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1answer
64 views

Summative Pattern

While playing around with J (link), I found that you can create a sequence of shape N0 N1 ... NK with i. taking a list as its ...
14
votes
1answer
267 views

Conway's Game of Life in J

I have the following code which produces successive generations of Conway's Game of Life: ...
2
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1answer
100 views

Initializing an array of relative coordinates of all adjacent 2D matrix cells

The program should output this: _1 _1 _1 0 _1 1 0 _1 0 1 1 _1 1 0 1 1 Currently I have this code: ...