java help (2d arrays)

Hi guys. I am working on a program that takes in a 2d array, and uses two methods to return a 1d array. One method for the average value of each row. One for the columns. Here is what I have so far in trying to get the average of the rows (with little success...actually I am just trying to get the sum of the values in each row...don't know how to do that either.)

public class TwoDaverage{
public static void main(String[] args){
double[] total;
double[][] nums = {{2,5,7},{6,4,8},{1,3,9}};
int i;
for (i=0;i<nums.length;i++){
total = rowAverage(nums);
System.out.println(total);
}

}
public static double[] rowAverage(double[][] row){
double[] sum = new double[3];

int i;
int j;

for (i =0; i < 3; i++){
for (j = 0; j < 3; j++){

sum[0] =sum + row[j];

}
}


return sum;
}
}


Any suggestions?

 

To help simplify the code, from the function, it looks like you meant the main loop to be

Code:

total = rowAverage(nums);
for (i=0;i<nums.length;i++){
System.out.println(total[i]);
}

with total assigned before the loop starts, so you can iterate through it.

In the function,
sum[0] =sum + row[j];
should probably be

Code:

sum[i]+= row[i][j];

assuming each sum starts at 0. I usually assign it, myself. I don't remember if Java zeros new variables automatically...