root / man / man3 / HPL_pdlange.3
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| 1 | 1 | equemene | .TH HPL_pdlange 3 "September 10, 2008" "HPL 2.0" "HPL Library Functions" |
|---|---|---|---|
| 2 | 1 | equemene | .SH NAME |
| 3 | 1 | equemene | HPL_pdlange \- Compute ||A||. |
| 4 | 1 | equemene | .SH SYNOPSIS |
| 5 | 1 | equemene | \fB\&#include "hpl.h"\fR |
| 6 | 1 | equemene | |
| 7 | 1 | equemene | \fB\&double\fR |
| 8 | 1 | equemene | \fB\&HPL_pdlange(\fR |
| 9 | 1 | equemene | \fB\&const HPL_T_grid *\fR |
| 10 | 1 | equemene | \fI\&GRID\fR, |
| 11 | 1 | equemene | \fB\&const HPL_T_NORM\fR |
| 12 | 1 | equemene | \fI\&NORM\fR, |
| 13 | 1 | equemene | \fB\&const int\fR |
| 14 | 1 | equemene | \fI\&M\fR, |
| 15 | 1 | equemene | \fB\&const int\fR |
| 16 | 1 | equemene | \fI\&N\fR, |
| 17 | 1 | equemene | \fB\&const int\fR |
| 18 | 1 | equemene | \fI\&NB\fR, |
| 19 | 1 | equemene | \fB\&const double *\fR |
| 20 | 1 | equemene | \fI\&A\fR, |
| 21 | 1 | equemene | \fB\&const int\fR |
| 22 | 1 | equemene | \fI\&LDA\fR |
| 23 | 1 | equemene | \fB\&);\fR |
| 24 | 1 | equemene | .SH DESCRIPTION |
| 25 | 1 | equemene | \fB\&HPL_pdlange\fR |
| 26 | 1 | equemene | returns the value of the one norm, or the infinity norm, |
| 27 | 1 | equemene | or the element of largest absolute value of a distributed matrix A: |
| 28 | 1 | equemene | |
| 29 | 1 | equemene | |
| 30 | 1 | equemene | max(abs(A(i,j))) when NORM = HPL_NORM_A, |
| 31 | 1 | equemene | norm1(A), when NORM = HPL_NORM_1, |
| 32 | 1 | equemene | normI(A), when NORM = HPL_NORM_I, |
| 33 | 1 | equemene | |
| 34 | 1 | equemene | where norm1 denotes the one norm of a matrix (maximum column sum) and |
| 35 | 1 | equemene | normI denotes the infinity norm of a matrix (maximum row sum). Note |
| 36 | 1 | equemene | that max(abs(A(i,j))) is not a matrix norm. |
| 37 | 1 | equemene | .SH ARGUMENTS |
| 38 | 1 | equemene | .TP 8 |
| 39 | 1 | equemene | GRID (local input) const HPL_T_grid * |
| 40 | 1 | equemene | On entry, GRID points to the data structure containing the |
| 41 | 1 | equemene | process grid information. |
| 42 | 1 | equemene | .TP 8 |
| 43 | 1 | equemene | NORM (global input) const HPL_T_NORM |
| 44 | 1 | equemene | On entry, NORM specifies the value to be returned by this |
| 45 | 1 | equemene | function as described above. |
| 46 | 1 | equemene | .TP 8 |
| 47 | 1 | equemene | M (global input) const int |
| 48 | 1 | equemene | On entry, M specifies the number of rows of the matrix A. |
| 49 | 1 | equemene | M must be at least zero. |
| 50 | 1 | equemene | .TP 8 |
| 51 | 1 | equemene | N (global input) const int |
| 52 | 1 | equemene | On entry, N specifies the number of columns of the matrix A. |
| 53 | 1 | equemene | N must be at least zero. |
| 54 | 1 | equemene | .TP 8 |
| 55 | 1 | equemene | NB (global input) const int |
| 56 | 1 | equemene | On entry, NB specifies the blocking factor used to partition |
| 57 | 1 | equemene | and distribute the matrix. NB must be larger than one. |
| 58 | 1 | equemene | .TP 8 |
| 59 | 1 | equemene | A (local input) const double * |
| 60 | 1 | equemene | On entry, A points to an array of dimension (LDA,LocQ(N)), |
| 61 | 1 | equemene | that contains the local pieces of the distributed matrix A. |
| 62 | 1 | equemene | .TP 8 |
| 63 | 1 | equemene | LDA (local input) const int |
| 64 | 1 | equemene | On entry, LDA specifies the leading dimension of the array A. |
| 65 | 1 | equemene | LDA must be at least max(1,LocP(M)). |
| 66 | 1 | equemene | .SH SEE ALSO |
| 67 | 1 | equemene | .BR HPL_pdlaprnt \ (3), |
| 68 | 1 | equemene | .BR HPL_fprintf \ (3). |