Question

I feel that it should be something very simple and obvious but just stuck on this for the last half an hour and can’t move on.

All I need is to split an array of elements into N groups based on element index.

For example we have an array of 30 elements [e1,e2,…e30], that has to be divided into N=3 groups like this:

group1: [e1, ..., e10] group2: [e11, ..., e20] group3: [e21, ..., e30] 

I came up with nasty mess like this for N=3 (pseudo language, I left multiplication on 0 and 1 just for clarification):

for(i=0;i<array_size;i++) {    if(i>=0*(array_size/3) && i<1*(array_size/3) {       print 'group1';    } else if(i>=1*(array_size/3) && i<2*(array_size/3) {       print 'group2';    } else if(i>=2*(array_size/3) && i<3*(array_size/3)       print 'group3';    } } 

But what would be the proper general solution?

Thanks.

Answer 1

What about something like this?

for(i=0;i<array_size;i++) {   print 'group' + (Math.floor(i/(array_size/N)) + 1) }