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#include "rb_lapack.h"
extern VOID stbtrs_(char* uplo, char* trans, char* diag, integer* n, integer* kd, integer* nrhs, real* ab, integer* ldab, real* b, integer* ldb, integer* info);
static VALUE
rblapack_stbtrs(int argc, VALUE *argv, VALUE self){
VALUE rblapack_uplo;
char uplo;
VALUE rblapack_trans;
char trans;
VALUE rblapack_diag;
char diag;
VALUE rblapack_kd;
integer kd;
VALUE rblapack_ab;
real *ab;
VALUE rblapack_b;
real *b;
VALUE rblapack_info;
integer info;
VALUE rblapack_b_out__;
real *b_out__;
integer ldab;
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.stbtrs( uplo, trans, diag, kd, ab, b, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE STBTRS( UPLO, TRANS, DIAG, N, KD, NRHS, AB, LDAB, B, LDB, INFO )\n\n* Purpose\n* =======\n*\n* STBTRS solves a triangular system of the form\n*\n* A * X = B or A**T * X = B,\n*\n* where A is a triangular band matrix of order N, and B is an\n* N-by NRHS matrix. A check is made to verify that A is nonsingular.\n*\n\n* Arguments\n* =========\n*\n* UPLO (input) CHARACTER*1\n* = 'U': A is upper triangular;\n* = 'L': A is lower triangular.\n*\n* TRANS (input) CHARACTER*1\n* Specifies the form the system of equations:\n* = 'N': A * X = B (No transpose)\n* = 'T': A**T * X = B (Transpose)\n* = 'C': A**H * X = B (Conjugate transpose = Transpose)\n*\n* DIAG (input) CHARACTER*1\n* = 'N': A is non-unit triangular;\n* = 'U': A is unit triangular.\n*\n* N (input) INTEGER\n* The order of the matrix A. N >= 0.\n*\n* KD (input) INTEGER\n* The number of superdiagonals or subdiagonals of the\n* triangular band matrix A. KD >= 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* AB (input) REAL array, dimension (LDAB,N)\n* The upper or lower triangular band matrix A, stored in the\n* first kd+1 rows of AB. The j-th column of A is stored\n* in the j-th column of the array AB as follows:\n* if UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j;\n* if UPLO = 'L', AB(1+i-j,j) = A(i,j) for j<=i<=min(n,j+kd).\n* If DIAG = 'U', the diagonal elements of A are not referenced\n* and are assumed to be 1.\n*\n* LDAB (input) INTEGER\n* The leading dimension of the array AB. LDAB >= KD+1.\n*\n* B (input/output) REAL array, dimension (LDB,NRHS)\n* On entry, the right hand side matrix B.\n* On exit, if INFO = 0, the solution matrix X.\n*\n* LDB (input) INTEGER\n* The leading dimension of the array B. LDB >= max(1,N).\n*\n* INFO (output) INTEGER\n* = 0: successful exit\n* < 0: if INFO = -i, the i-th argument had an illegal value\n* > 0: if INFO = i, the i-th diagonal element of A is zero,\n* indicating that the matrix is singular and the\n* solutions X have not been computed.\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.stbtrs( uplo, trans, diag, kd, ab, b, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 6 && argc != 6)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 6)", argc);
rblapack_uplo = argv[0];
rblapack_trans = argv[1];
rblapack_diag = argv[2];
rblapack_kd = argv[3];
rblapack_ab = argv[4];
rblapack_b = argv[5];
if (argc == 6) {
} else if (rblapack_options != Qnil) {
} else {
}
uplo = StringValueCStr(rblapack_uplo)[0];
diag = StringValueCStr(rblapack_diag)[0];
if (!NA_IsNArray(rblapack_ab))
rb_raise(rb_eArgError, "ab (5th argument) must be NArray");
if (NA_RANK(rblapack_ab) != 2)
rb_raise(rb_eArgError, "rank of ab (5th argument) must be %d", 2);
ldab = NA_SHAPE0(rblapack_ab);
n = NA_SHAPE1(rblapack_ab);
if (NA_TYPE(rblapack_ab) != NA_SFLOAT)
rblapack_ab = na_change_type(rblapack_ab, NA_SFLOAT);
ab = NA_PTR_TYPE(rblapack_ab, real*);
trans = StringValueCStr(rblapack_trans)[0];
if (!NA_IsNArray(rblapack_b))
rb_raise(rb_eArgError, "b (6th argument) must be NArray");
if (NA_RANK(rblapack_b) != 2)
rb_raise(rb_eArgError, "rank of b (6th argument) must be %d", 2);
ldb = NA_SHAPE0(rblapack_b);
nrhs = NA_SHAPE1(rblapack_b);
if (NA_TYPE(rblapack_b) != NA_SFLOAT)
rblapack_b = na_change_type(rblapack_b, NA_SFLOAT);
b = NA_PTR_TYPE(rblapack_b, real*);
kd = NUM2INT(rblapack_kd);
{
na_shape_t shape[2];
shape[0] = ldb;
shape[1] = nrhs;
rblapack_b_out__ = na_make_object(NA_SFLOAT, 2, shape, cNArray);
}
b_out__ = NA_PTR_TYPE(rblapack_b_out__, real*);
MEMCPY(b_out__, b, real, NA_TOTAL(rblapack_b));
rblapack_b = rblapack_b_out__;
b = b_out__;
stbtrs_(&uplo, &trans, &diag, &n, &kd, &nrhs, ab, &ldab, b, &ldb, &info);
rblapack_info = INT2NUM(info);
return rb_ary_new3(2, rblapack_info, rblapack_b);
}
void
init_lapack_stbtrs(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "stbtrs", rblapack_stbtrs, -1);
}
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