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1 SUBROUTINE DLACPY( UPLO, M, N, A, LDA, B, LDB ) |
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2 * |
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3 * -- LAPACK auxiliary routine (version 3.0) -- |
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4 * Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd., |
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5 * Courant Institute, Argonne National Lab, and Rice University |
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6 * February 29, 1992 |
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7 * |
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8 * .. Scalar Arguments .. |
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9 CHARACTER UPLO |
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10 INTEGER LDA, LDB, M, N |
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11 * .. |
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12 * .. Array Arguments .. |
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13 DOUBLE PRECISION A( LDA, * ), B( LDB, * ) |
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14 * .. |
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15 * |
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16 * Purpose |
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17 * ======= |
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18 * |
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19 * DLACPY copies all or part of a two-dimensional matrix A to another |
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20 * matrix B. |
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21 * |
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22 * Arguments |
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23 * ========= |
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24 * |
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25 * UPLO (input) CHARACTER*1 |
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26 * Specifies the part of the matrix A to be copied to B. |
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27 * = 'U': Upper triangular part |
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28 * = 'L': Lower triangular part |
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29 * Otherwise: All of the matrix A |
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30 * |
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31 * M (input) INTEGER |
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32 * The number of rows of the matrix A. M >= 0. |
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33 * |
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34 * N (input) INTEGER |
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35 * The number of columns of the matrix A. N >= 0. |
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36 * |
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37 * A (input) DOUBLE PRECISION array, dimension (LDA,N) |
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38 * The m by n matrix A. If UPLO = 'U', only the upper triangle |
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39 * or trapezoid is accessed; if UPLO = 'L', only the lower |
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40 * triangle or trapezoid is accessed. |
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41 * |
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42 * LDA (input) INTEGER |
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43 * The leading dimension of the array A. LDA >= max(1,M). |
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44 * |
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45 * B (output) DOUBLE PRECISION array, dimension (LDB,N) |
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46 * On exit, B = A in the locations specified by UPLO. |
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47 * |
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48 * LDB (input) INTEGER |
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49 * The leading dimension of the array B. LDB >= max(1,M). |
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50 * |
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51 * ===================================================================== |
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52 * |
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53 * .. Local Scalars .. |
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54 INTEGER I, J |
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55 * .. |
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56 * .. External Functions .. |
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57 LOGICAL LSAME |
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58 EXTERNAL LSAME |
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59 * .. |
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60 * .. Intrinsic Functions .. |
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61 INTRINSIC MIN |
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62 * .. |
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63 * .. Executable Statements .. |
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64 * |
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65 IF( LSAME( UPLO, 'U' ) ) THEN |
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66 DO 20 J = 1, N |
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67 DO 10 I = 1, MIN( J, M ) |
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68 B( I, J ) = A( I, J ) |
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69 10 CONTINUE |
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70 20 CONTINUE |
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71 ELSE IF( LSAME( UPLO, 'L' ) ) THEN |
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72 DO 40 J = 1, N |
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73 DO 30 I = J, M |
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74 B( I, J ) = A( I, J ) |
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75 30 CONTINUE |
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76 40 CONTINUE |
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77 ELSE |
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78 DO 60 J = 1, N |
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79 DO 50 I = 1, M |
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80 B( I, J ) = A( I, J ) |
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81 50 CONTINUE |
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82 60 CONTINUE |
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83 END IF |
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84 RETURN |
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85 * |
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86 * End of DLACPY |
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87 * |
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88 END |
