1ZGETRS(1) LAPACK routine (version 3.2) ZGETRS(1)
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6 ZGETRS - solves a system of linear equations A * X = B, A**T * X = B,
7 or A**H * X = B with a general N-by-N matrix A using the LU factoriza‐
8 tion computed by ZGETRF
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11 SUBROUTINE ZGETRS( TRANS, N, NRHS, A, LDA, IPIV, B, LDB, INFO )
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13 CHARACTER TRANS
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15 INTEGER INFO, LDA, LDB, N, NRHS
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17 INTEGER IPIV( * )
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19 COMPLEX*16 A( LDA, * ), B( LDB, * )
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22 ZGETRS solves a system of linear equations
23 A * X = B, A**T * X = B, or A**H * X = B with a general N-by-N
24 matrix A using the LU factorization computed by ZGETRF.
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27 TRANS (input) CHARACTER*1
28 Specifies the form of the system of equations:
29 = 'N': A * X = B (No transpose)
30 = 'T': A**T * X = B (Transpose)
31 = 'C': A**H * X = B (Conjugate transpose)
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33 N (input) INTEGER
34 The order of the matrix A. N >= 0.
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36 NRHS (input) INTEGER
37 The number of right hand sides, i.e., the number of columns of
38 the matrix B. NRHS >= 0.
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40 A (input) COMPLEX*16 array, dimension (LDA,N)
41 The factors L and U from the factorization A = P*L*U as com‐
42 puted by ZGETRF.
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44 LDA (input) INTEGER
45 The leading dimension of the array A. LDA >= max(1,N).
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47 IPIV (input) INTEGER array, dimension (N)
48 The pivot indices from ZGETRF; for 1<=i<=N, row i of the matrix
49 was interchanged with row IPIV(i).
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51 B (input/output) COMPLEX*16 array, dimension (LDB,NRHS)
52 On entry, the right hand side matrix B. On exit, the solution
53 matrix X.
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55 LDB (input) INTEGER
56 The leading dimension of the array B. LDB >= max(1,N).
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58 INFO (output) INTEGER
59 = 0: successful exit
60 < 0: if INFO = -i, the i-th argument had an illegal value
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64 LAPACK routine (version 3.2) November 2008 ZGETRS(1)