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Thanks, I finally solved my problem. I really appreciate all the help you have given me! :D :D
If it had not been for your insight it probably would have taken me much longer, thank you so much...

So, I solved it. Now I only need help with calculating the major diagonal



public static double sumColumn(double[][] matrix, int column){

int row;
double sum = 0;
//below is...

this is the code where the summation is completed:
Thank you for your assistance



public static double sumColumn(double[][] matrix, int columnIndex){

double sum = 0;
//below...

Thank you very much for the fast response. :)
my output needs to look some thing like this. like this:

"Enter a 3-by-3 matrix row by row:
Row 1: 1 2 3
Row 2: 5 6 7
Row 3: 9 1 3

The sum...

I am having trouble fixing and figuring out how to change my code. My out put is very off, and I was wondering if anyone could give me insight to why, maybe even pose a solution,

"Enter a 3-by-3...