Sum of an Array

Programming Questions

shashmore

in Programming Questions • 2 years ago

I'm new to processing and need help with an array question. I need to sum up a 2D array into a 1D array.

For example, {10, 5, 3}, {9, 4, 2}, {3, 8, 5} would turn into {22, 17, 10}.

My data is from a table so essentially I want the new array to have the sums of each column.

Does anyone know how to do this? Thanks.

Replies(4)

PhiLho

It is better to start from your base code (your variables, etc.), so please show what you have got so far, we will push you in the right direction.
Currently, we can only give general advices like looping on the first dimension of the 2D array, then on the second for each row to do the sum, and assign the result of the row to the corresponding entry in the result array.

shashmore

Re: Re: Sum of an Array

2 years ago

Ahhh okay I'll be sure to add more context to my question next time. Thanks :)

amnon.owed

Re: Sum of an Array

2 years ago

Something like this.

int[][] myArray = {
{ 10, 5, 3 },
{ 9, 4, 2 },
{ 3, 8, 5 }
};
int rows = 3;
int cols = 3;
int[] sum = new int[cols];
for (int c=0; c<cols; c++) { // for every column
for (int r=0; r<rows; r++) { // for every row
sum[c] += myArray[r][c]; // sum up the values per column
}
}
println(sum[0]); // 22
println(sum[1]); // 17
println(sum[2]); // 10

shashmore

Re: Re: Sum of an Array

2 years ago

Thanks so much! I knew it was a matter of simple looping, but I was getting a little confused. :)

Sum of an Array

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