| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| subroutine ninvr |
| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| c--------------------------------------------------------------------- |
| c block-diagonal matrix-vector multiplication |
| c--------------------------------------------------------------------- |
| |
| include 'header.h' |
| |
| integer i, j, k |
| double precision r1, r2, r3, r4, r5, t1, t2 |
| |
| if (timeron) call timer_start(t_ninvr) |
| do k = 1, nz2 |
| do j = 1, ny2 |
| do i = 1, nx2 |
| |
| r1 = rhs(1,i,j,k) |
| r2 = rhs(2,i,j,k) |
| r3 = rhs(3,i,j,k) |
| r4 = rhs(4,i,j,k) |
| r5 = rhs(5,i,j,k) |
| |
| t1 = bt * r3 |
| t2 = 0.5d0 * ( r4 + r5 ) |
| |
| rhs(1,i,j,k) = -r2 |
| rhs(2,i,j,k) = r1 |
| rhs(3,i,j,k) = bt * ( r4 - r5 ) |
| rhs(4,i,j,k) = -t1 + t2 |
| rhs(5,i,j,k) = t1 + t2 |
| enddo |
| enddo |
| enddo |
| if (timeron) call timer_stop(t_ninvr) |
| |
| return |
| end |
