Using only one loop to generate nested arrays

Question

I am trying to come up with an algorithm to generate a nested array of consecutive numbers using only one loop. I feel it should be solved somehow using remainder operator but can't quite come up with a general solution. Anyone has any suggestion or hints?

input: 4 output: 1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4

Why not just use nested loop ? Simple and easy to understand — Ed Heal
– Ed Heal, Commented Dec 6, 2014 at 13:01

Guffa · Accepted Answer · 2014-12-06 13:08:38Z

3

You would use the modulo operator (%), but note that you should loop from zero and up, and the result from modulo is also from zero and up, so you have to add one to it.

var input = 4;

for (var i = 0; i < input * input; i++) {
  var n = (i % input) + 1;
  
  document.write(n + '<br>');

}

answered Dec 6, 2014 at 13:08

Guffa

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Comments

Ludovic Feltz · Accepted Answer · 2014-12-06 13:09:59Z

2

Something like that should do the trick:

int input = ...
int i = 0;

while(i<=(input*input)){
    int output = (i % input) + 1;
    i++;
}

edited Dec 6, 2014 at 13:09

answered Dec 6, 2014 at 13:01

Ludovic Feltz

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2 Comments

bob-fornal Over a year ago

This is very elegant, but my next thought is that it is not quite as intuitive as a nested array would be.

bob-fornal Over a year ago

@Ludovic, I certainly understand that ... just throwing in the random thoughts I'm having after being up all night.

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