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#include "rb_lapack.h"
extern VOID chetrs2_(char* uplo, integer* n, integer* nrhs, complex* a, integer* lda, integer* ipiv, complex* b, integer* ldb, complex* work, integer* info);
static VALUE
rblapack_chetrs2(int argc, VALUE *argv, VALUE self){
VALUE rblapack_uplo;
char uplo;
VALUE rblapack_a;
complex *a;
VALUE rblapack_ipiv;
integer *ipiv;
VALUE rblapack_b;
complex *b;
VALUE rblapack_info;
integer info;
VALUE rblapack_b_out__;
complex *b_out__;
complex *work;
integer lda;
integer n;
integer ldb;
integer nrhs;
VALUE rblapack_options;
if (argc > 0 && TYPE(argv[argc-1]) == T_HASH) {
argc--;
rblapack_options = argv[argc];
if (rb_hash_aref(rblapack_options, sHelp) == Qtrue) {
printf("%s\n", "USAGE:\n info, b = NumRu::Lapack.chetrs2( uplo, a, ipiv, b, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE CHETRS2( UPLO, N, NRHS, A, LDA, IPIV, B, LDB, WORK, INFO )\n\n* Purpose\n* =======\n*\n* CHETRS2 solves a system of linear equations A*X = B with a COMPLEX\n* Hermitian matrix A using the factorization A = U*D*U**T or\n* A = L*D*L**T computed by CSYTRF and converted by CSYCONV.\n*\n\n* Arguments\n* =========\n*\n* UPLO (input) CHARACTER*1\n* Specifies whether the details of the factorization are stored\n* as an upper or lower triangular matrix.\n* = 'U': Upper triangular, form is A = U*D*U**H;\n* = 'L': Lower triangular, form is A = L*D*L**H.\n*\n* N (input) INTEGER\n* The order of the matrix A. N >= 0.\n*\n* NRHS (input) INTEGER\n* The number of right hand sides, i.e., the number of columns\n* of the matrix B. NRHS >= 0.\n*\n* A (input) COMPLEX array, dimension (LDA,N)\n* The block diagonal matrix D and the multipliers used to\n* obtain the factor U or L as computed by CHETRF.\n*\n* LDA (input) INTEGER\n* The leading dimension of the array A. LDA >= max(1,N).\n*\n* IPIV (input) INTEGER array, dimension (N)\n* Details of the interchanges and the block structure of D\n* as determined by CHETRF.\n*\n* B (input/output) COMPLEX array, dimension (LDB,NRHS)\n* On entry, the right hand side matrix B.\n* On exit, the solution matrix X.\n*\n* LDB (input) INTEGER\n* The leading dimension of the array B. LDB >= max(1,N).\n*\n* WORK (workspace) COMPLEX array, dimension (N)\n*\n* INFO (output) INTEGER\n* = 0: successful exit\n* < 0: if INFO = -i, the i-th argument had an illegal value\n*\n\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n info, b = NumRu::Lapack.chetrs2( uplo, a, ipiv, b, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 4 && argc != 4)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 4)", argc);
rblapack_uplo = argv[0];
rblapack_a = argv[1];
rblapack_ipiv = argv[2];
rblapack_b = argv[3];
if (argc == 4) {
} else if (rblapack_options != Qnil) {
} else {
}
uplo = StringValueCStr(rblapack_uplo)[0];
if (!NA_IsNArray(rblapack_ipiv))
rb_raise(rb_eArgError, "ipiv (3th argument) must be NArray");
if (NA_RANK(rblapack_ipiv) != 1)
rb_raise(rb_eArgError, "rank of ipiv (3th argument) must be %d", 1);
n = NA_SHAPE0(rblapack_ipiv);
if (NA_TYPE(rblapack_ipiv) != NA_LINT)
rblapack_ipiv = na_change_type(rblapack_ipiv, NA_LINT);
ipiv = NA_PTR_TYPE(rblapack_ipiv, integer*);
if (!NA_IsNArray(rblapack_a))
rb_raise(rb_eArgError, "a (2th argument) must be NArray");
if (NA_RANK(rblapack_a) != 2)
rb_raise(rb_eArgError, "rank of a (2th argument) must be %d", 2);
lda = NA_SHAPE0(rblapack_a);
if (NA_SHAPE1(rblapack_a) != n)
rb_raise(rb_eRuntimeError, "shape 1 of a must be the same as shape 0 of ipiv");
if (NA_TYPE(rblapack_a) != NA_SCOMPLEX)
rblapack_a = na_change_type(rblapack_a, NA_SCOMPLEX);
a = NA_PTR_TYPE(rblapack_a, complex*);
if (!NA_IsNArray(rblapack_b))
rb_raise(rb_eArgError, "b (4th argument) must be NArray");
if (NA_RANK(rblapack_b) != 2)
rb_raise(rb_eArgError, "rank of b (4th argument) must be %d", 2);
ldb = NA_SHAPE0(rblapack_b);
nrhs = NA_SHAPE1(rblapack_b);
if (NA_TYPE(rblapack_b) != NA_SCOMPLEX)
rblapack_b = na_change_type(rblapack_b, NA_SCOMPLEX);
b = NA_PTR_TYPE(rblapack_b, complex*);
{
na_shape_t shape[2];
shape[0] = ldb;
shape[1] = nrhs;
rblapack_b_out__ = na_make_object(NA_SCOMPLEX, 2, shape, cNArray);
}
b_out__ = NA_PTR_TYPE(rblapack_b_out__, complex*);
MEMCPY(b_out__, b, complex, NA_TOTAL(rblapack_b));
rblapack_b = rblapack_b_out__;
b = b_out__;
work = ALLOC_N(complex, (n));
chetrs2_(&uplo, &n, &nrhs, a, &lda, ipiv, b, &ldb, work, &info);
free(work);
rblapack_info = INT2NUM(info);
return rb_ary_new3(2, rblapack_info, rblapack_b);
}
void
init_lapack_chetrs2(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "chetrs2", rblapack_chetrs2, -1);
}
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