Triangular | STRMM/DTRMM/CTRMM/ZTRMM | |
| lda | The leading dimension of array a as declared in the |
|
| calling program unit, with lda ≥ max (the number of |
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| rows of A,1). |
| b | Array containing the |
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| input if alpha = 0. |
| ldb | The leading dimension of array b as declared in the |
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| calling program unit, with ldb ≥ max(m,1). |
Output | b | The indicated matrix product replaces the input. |
Notes | These subprograms conform to specifications of the Level 3 BLAS. | |
| If an error in the arguments is detected, the subprograms call error handler | |
| XERBLA, which writes an error message onto the standard error file and | |
| terminates execution. The standard version of XERBLA (refer to the end of this | |
| chapter) can be replaced with a | |
| procedure. Error conditions are: | |
side ≠ ’L’ or ’l’ or ’R’ or ’r’ uplo ≠ ’L’ or ’l’ or ’U’ or ’u’
transa ≠ ’N’ or ’n’ or ’T’ or ’t’ or ’C’ or ’c’ diag ≠ ’N’ or ’n’ or ’U’ or ’u’
m < 0 n < 0
lda too small ldb < max(m,1)
Actual character arguments in a subroutine call can be longer than the corresponding dummy arguments. Therefore, readability of the CALL statement may be improved, for example, by coding the transa argument as ’NORMAL’ or ’NONTRANS’ for ’N’, ’TRANSPOSE’ for ’T’, or ’CTRANS’ for ’C’. Refer to “Example 2.”
Chapter 3 Basic Matrix Operations 321