root / synthbench / euroben-dm / mod2as / check.f @ 0:839f52ef7657
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| 1 | 0:839f52ef7657 | louridas | Subroutine check( ncols, nrows, nelmts, indx, rowp, outvec, ok ) |
|---|---|---|---|
| 2 | 0:839f52ef7657 | louridas | ! --------------------------------------------------------------------- |
| 3 | 0:839f52ef7657 | louridas | ! --- Routine 'check' checks the solution vector 'x' in 'b = Ax'. The |
| 4 | 0:839f52ef7657 | louridas | ! check is possible because of the special definition of 'A' & 'b'. |
| 5 | 0:839f52ef7657 | louridas | ! --------------------------------------------------------------------- |
| 6 | 0:839f52ef7657 | louridas | Use numerics |
| 7 | 0:839f52ef7657 | louridas | Use dist_module |
| 8 | 0:839f52ef7657 | louridas | Implicit None |
| 9 | 0:839f52ef7657 | louridas | |
| 10 | 0:839f52ef7657 | louridas | Integer :: ncols, nrows, nelmts |
| 11 | 0:839f52ef7657 | louridas | Integer :: indx(nelmts), rowp(nrows) |
| 12 | 0:839f52ef7657 | louridas | Real(l_) :: outvec(nrows) |
| 13 | 0:839f52ef7657 | louridas | Logical :: ok |
| 14 | 0:839f52ef7657 | louridas | |
| 15 | 0:839f52ef7657 | louridas | Integer :: i |
| 16 | 0:839f52ef7657 | louridas | Real(l_) :: eps, rowsum |
| 17 | 0:839f52ef7657 | louridas | ! --------------------------------------------------------------------- |
| 18 | 0:839f52ef7657 | louridas | eps = 2.0_l_*ncols*Epsilon( 1.0_l_ ) |
| 19 | 0:839f52ef7657 | louridas | Do i = 1, nrows - 1 |
| 20 | 0:839f52ef7657 | louridas | rowsum = Real( rowp(i+1) - rowp(i), l_ ) |
| 21 | 0:839f52ef7657 | louridas | ok = ok .AND. ( Abs( outvec(i) - rowsum ) <= eps ) |
| 22 | 0:839f52ef7657 | louridas | End Do |
| 23 | 0:839f52ef7657 | louridas | rowsum = Real( nelmts - rowp(nrows) + 1, l_ ) |
| 24 | 0:839f52ef7657 | louridas | ok = ok .AND. ( Abs( outvec(nrows) - rowsum ) <= eps ) |
| 25 | 0:839f52ef7657 | louridas | ! --------------------------------------------------------------------- |
| 26 | 0:839f52ef7657 | louridas | End Subroutine check |