Update array elements

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hello there
I try to update elements of a array but it does not perform correctly
for instance I have this array:

static double[,] weigh = { { 0.05, 0.1 }, { 0.2, 0.2 }, { 0.5, 0.5 } };

and I try to perform this on it:

for (k = 0; k < 2; k++)
                            {
                                if (z_input[k] > 0.0)
                                {
                                    bias[k] = bias[k] + 0.5 * (-1.0 - z_input[k]);
                                    weigh[k, 0] += (0.5 * (-1.0 - z_input[k]) * input1);
                                    weigh[k, 1] += (0.5 * (-1.0 - z_input[k]) * input2);
                                }
                            }

it performs on w[0,0] and w[0,1] correctly but give me w[1,0] and w[1,1] wrong!
what's wrong with it?
help me
thanks

What I have tried:

static int[,] input = { { 1, 1 }, { 1, -1 }, { -1, 1 } };
        static int[] target = { -1, 1, 1 };
        static double[,] weigh = { { 0.05, 0.1 }, { 0.2, 0.2 } };
        static double[] vector = { 0.5, 0.5 };
        static double[] bias = { 0.3, 0.15, 0.5 };
        static bool epoch = true;
        static int input1 = 0, input2 = 0;
        static int k = 0;
        static double[] z_input = new double[2];
        static int[] z_layer = new int[2];
        static double y_input;
        static int y;

if (target[j] == -1)
                       {

                           for (k = 0; k < 2; k++)
                           {
                               if (z_input[k] > 0.0)
                               {
                                   bias[k] = bias[k] + 0.5 * (-1.0 - z_input[k]);
                                   weigh[k, 0] += (0.5 * (-1.0 - z_input[k]) * input1);
                                   weigh[k, 1] += (0.5 * (-1.0 - z_input[k]) * input2);
                               }
                           }

                       }

Posted 18-Jul-17 7:06am

amir.nazarizadeh

Updated 18-Jul-17 7:29am

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Comments

LLLLGGGG 18-Jul-17 13:22pm

It does not update the element of the array or it updates them but the value is not what you want?

amir.nazarizadeh 18-Jul-17 13:37pm

it updates but when second iteration of loop (k=1) starts, it updates weighs wrong!

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Patrice T · Answer 1 · 2017-07-18T07:29:00

We have no idea of what can go wrong because you didn't gave us an autonomous piece of code, we can't test your code or reproduce the problem;
The only useful advice is to learn the debugger to see what the code is doing.

There is a tool that allow you to see what your code is doing, its name is debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]
Debugging C# Code in Visual Studio - YouTube[^]
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

Quote:
with debugger I found that the weights are wrong.

Can you update the question with a short piece of code that reproduce the problem ?
"weights are wrong" id not informative, give details.