Hi everyone:

I have written C++ code for populating a matrix/2D array with calculation results. Each column of the array represents results for a distinct time step.

My problem arises because the rows of my results vector do NOT correspond to the rows of the matrix. The matrix includes extra rows (I need these to store other information), so the matrix rows do NOT correspond to the vector rows.

I have written code to specify where in the matrix to store each vector element, but it is generating incorrect results. Instead of putting each vector element in the right place in the matrix for each time step (column), my code is taking the LAST element of each vector and filling an entire matrix column with it.

I would very much appreciate any help in figuring out where I'm going wrong! My code is below:

```
for (int j = 1; j <= someTime; j++) // Each j is a single time step
{
// Do calculation and get results vector (not included here)
for (int i = 0; i < (d_x * d_x); i++) // Each i is an element in the results vector
{
for (int k = 0; k < (((d_x + 2) * (d_x + 2)) - (d_x + 2)); k++)
{ // the code for k specifies where in the matrix each vector element should go.
if ( k % (d_x + 2) != 0 && k > (d_x + 1))
{
if ( (k - d_x - 1) % (d_x + 2) != 0 )
{
solutionMatrix(k,j) = temperatureNew[i]; // Put each element of results vector (temperatureNew) in the appropriate place in the matrix.
}
}
}
}
}
```