Hello,

I was trying to export mass matrices and load vectors when I saw something I did not expect.

Looking at the dbg file it appears the mass matrix for a given mesh refinement corresponds to the heading "SPACE JACOBIAN".

After the mass matrix appears a set of RHS and SOLUTION vectors. It seems that for a linear problem (like the one below that I used to check this out) there are nested iterations with the solution of the outermost iteration printed out at each outermost iteration step. Hence we see a handful of rhs's and solution's for each grid.

The issue is that the rhs, which I thought was the load vector, seems to change during these outermost iterations. I thought that for a given grid the load vector for a linear problem (and the below problem is linear) should not change.

Hopefully someone can help me understand what's going on here. Is RHS the load vector? If RHS is not the load vector, what is it? If RHS is not the load vector, where is the load vector stored? If RHS is the load vector, why is it changing?

Also while I am here, I don't suppose it might be possible to change the output for the matrix and load vector. Ideally, it would have more significant digits. Also, currently a lot of 0's are printed out though that might just be small numbers that look like zeros because only a few significant digits are printed out.

Typical mass matrix/load vector export:

SELECT

print(matrix)

print(grid)

reorder off

VARIABLES

u

EQUATIONS

div(grad(u))=0

BOUNDARIES

REGION 1

START(0,0) value(u) = 1 LINE TO (1,0) TO (1,1) TO (0,1) value(u) = 0 line TO CLOSE

MONITORS

PLOTS

CONTOUR(u)

END

Alright, have a good day.

Jared