how to create matrix/array of array with fix number of rows and non-fixed number of columns?

Question

here am trying to create mtrix with fixed number of rows and non-fixed number of columns like bellow.

var matrix=[[0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 0, 0,0 ]]

am trying this code

function matrix1(m, n) {
    for (  m = 9;m>0;m--)
    {
        for (var n=m;n>0; n--)
        {   
             return Array.from({  
                 length: m
              }, () => new Array(n).fill(0));
        }
        document.write("<br>");      
    }      
};

var cols=9
var counter=9;
matrix(counter,cols);

and am expecting the output of this code is as like

var matrix=[[0, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0],
            [0, 0, 0],
            [0, 0],
            [0]]

and am getting output as

var matrix=[[0, 0, 0, 0, 0, 0, 0, 0, 0],
             [0, 0, 0, 0, 0, 0, 0, 0, 0],
             [0, 0, 0, 0, 0, 0, 0, 0, 0],
             [0, 0, 0, 0, 0, 0, 0, 0, 0], 
             [0, 0, 0, 0, 0, 0, 0, 0, 0],
             [0, 0, 0, 0, 0, 0, 0, 0, 0],
             [0, 0, 0, 0, 0, 0, 0, 0, 0], 
             [0, 0, 0, 0, 0, 0, 0, 0, 0],
             [0, 0, 0, 0, 0, 0, 0, 0, 0]]

whats wrong with my code?

KrishCdbry · Accepted Answer · 2016-09-12 08:59:52Z

1

Just small modification in your code

function matrix(m, n) {
 var arr = [];
 for (  m = 9; m>0; m--)
    {
      for (var n = m;n>0; n--)
         {
           arr.push(new Array(n).fill(0))
         }
       return arr;
    }  
 };

var cols=9
var counter=9;
console.log(matrix(counter,cols));

This will work

Working live example : https://jsbin.com/?html,js,output

Hope this helps. Thanks !

answered Sep 12, 2016 at 8:59

KrishCdbry

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2 Comments

sharepoint2013 Over a year ago

Thanks,@KrishCdbry

KrishCdbry Over a year ago

Most Welcome @M56035G :)

Rajesh Dixit · Accepted Answer · 2016-09-12 09:30:17Z

1

You can use a combination of array.map and array.fill

function createMatrix(m, n) {
  return new Array(m).fill('').map(function(el, index) {
    return n > index ? new Array(n - index).fill(0) : [];
  });
}
console.log(createMatrix(7, 7))

edited Sep 12, 2016 at 9:30

answered Sep 12, 2016 at 8:55

Rajesh Dixit

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2 Comments

sharepoint2013 Over a year ago

this is exclt what i was trying,but this code create minimum column sized array with 3,what if i want it till 1

sharepoint2013 Over a year ago

Thanks @Rajesh it is realy helpfull

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