Question

I need to add recurrently a 2 dimensional array. The ideea is that I have a generated 2 dimensional array and I have to get the sum of all the generated arrays.
I tried writing:

sum+=parseFloat(twoArray[a][b]); 

however the script is blocked and I do not get anything. it is a loop so the values of a, b float from 0 to a variable inserted by the user. I have tested the script and this is the line where it breaks.

if (k>=3){                          
    for(var i=0;i<A.length;i++){
        var smaller=new Array(A.length-1);
        for(var h=0;h<smaller.length;h++){
            smaller[h]=new Array(smaller.length);
        }
        for(var a=1;a<A.length;a++){
            for(var b=0;b<A.length;b++){
                if(b<i){
                    smaller[a-1][b]=A[a][b];
                }
                else if(b>i){
                    smaller[a-1][b-1]=A[a][b];
                }
            }   
        }
        sum+=parseFloat(smaller[a][b]);
        alert (sum);
        //dam valorile
    }
}
}

Answer 1

Put a

try {
  sum+=parseFloat(twoArray[a][b]);
} catch (e) {
   console.log(e)
}

in your loop.

So you’ll see where it gets blocked and invalid inputs won’t prevent the remaining summations.

Of course, I suppose you correctly checked array indexes vs lengths before.