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#include "rb_lapack.h"
extern VOID cla_lin_berr_(integer* n, integer* nz, integer* nrhs, doublereal* res, doublereal* ayb, complex* berr);
static VALUE
rblapack_cla_lin_berr(int argc, VALUE *argv, VALUE self){
#ifdef USEXBLAS
VALUE rblapack_nz;
integer nz;
VALUE rblapack_res;
doublereal *res;
VALUE rblapack_ayb;
doublereal *ayb;
VALUE rblapack_berr;
complex *berr;
integer n;
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 berr = NumRu::Lapack.cla_lin_berr( nz, res, ayb, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE CLA_LIN_BERR ( N, NZ, NRHS, RES, AYB, BERR )\n\n* Purpose\n* =======\n*\n* CLA_LIN_BERR computes componentwise relative backward error from\n* the formula\n* max(i) ( abs(R(i)) / ( abs(op(A_s))*abs(Y) + abs(B_s) )(i) )\n* where abs(Z) is the componentwise absolute value of the matrix\n* or vector Z.\n*\n\n* N (input) INTEGER\n* The number of linear equations, i.e., the order of the\n* matrix A. N >= 0.\n*\n* NZ (input) INTEGER\n* We add (NZ+1)*SLAMCH( 'Safe minimum' ) to R(i) in the numerator to\n* guard against spuriously zero residuals. Default value is N.\n*\n* NRHS (input) INTEGER\n* The number of right hand sides, i.e., the number of columns\n* of the matrices AYB, RES, and BERR. NRHS >= 0.\n*\n* RES (input) DOUBLE PRECISION array, dimension (N,NRHS)\n* The residual matrix, i.e., the matrix R in the relative backward\n* error formula above.\n*\n* AYB (input) DOUBLE PRECISION array, dimension (N, NRHS)\n* The denominator in the relative backward error formula above, i.e.,\n* the matrix abs(op(A_s))*abs(Y) + abs(B_s). The matrices A, Y, and B\n* are from iterative refinement (see cla_gerfsx_extended.f).\n* \n* BERR (output) COMPLEX array, dimension (NRHS)\n* The componentwise relative backward error from the formula above.\n*\n\n* =====================================================================\n*\n* .. Local Scalars ..\n REAL TMP\n INTEGER I, J\n COMPLEX CDUM\n* ..\n* .. Intrinsic Functions ..\n INTRINSIC ABS, REAL, AIMAG, MAX\n* ..\n* .. External Functions ..\n EXTERNAL SLAMCH\n REAL SLAMCH\n REAL SAFE1\n* ..\n* .. Statement Functions ..\n COMPLEX CABS1\n* ..\n* .. Statement Function Definitions ..\n CABS1( CDUM ) = ABS( REAL( CDUM ) ) + ABS( AIMAG( CDUM ) )\n* ..\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n berr = NumRu::Lapack.cla_lin_berr( nz, res, ayb, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 3 && argc != 3)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 3)", argc);
rblapack_nz = argv[0];
rblapack_res = argv[1];
rblapack_ayb = argv[2];
if (argc == 3) {
} else if (rblapack_options != Qnil) {
} else {
}
nz = NUM2INT(rblapack_nz);
if (!NA_IsNArray(rblapack_ayb))
rb_raise(rb_eArgError, "ayb (3th argument) must be NArray");
if (NA_RANK(rblapack_ayb) != 2)
rb_raise(rb_eArgError, "rank of ayb (3th argument) must be %d", 2);
n = NA_SHAPE0(rblapack_ayb);
nrhs = NA_SHAPE1(rblapack_ayb);
if (NA_TYPE(rblapack_ayb) != NA_DFLOAT)
rblapack_ayb = na_change_type(rblapack_ayb, NA_DFLOAT);
ayb = NA_PTR_TYPE(rblapack_ayb, doublereal*);
if (!NA_IsNArray(rblapack_res))
rb_raise(rb_eArgError, "res (2th argument) must be NArray");
if (NA_RANK(rblapack_res) != 2)
rb_raise(rb_eArgError, "rank of res (2th argument) must be %d", 2);
if (NA_SHAPE0(rblapack_res) != n)
rb_raise(rb_eRuntimeError, "shape 0 of res must be the same as shape 0 of ayb");
if (NA_SHAPE1(rblapack_res) != nrhs)
rb_raise(rb_eRuntimeError, "shape 1 of res must be the same as shape 1 of ayb");
if (NA_TYPE(rblapack_res) != NA_DFLOAT)
rblapack_res = na_change_type(rblapack_res, NA_DFLOAT);
res = NA_PTR_TYPE(rblapack_res, doublereal*);
{
na_shape_t shape[1];
shape[0] = nrhs;
rblapack_berr = na_make_object(NA_SCOMPLEX, 1, shape, cNArray);
}
berr = NA_PTR_TYPE(rblapack_berr, complex*);
cla_lin_berr_(&n, &nz, &nrhs, res, ayb, berr);
return rblapack_berr;
#else
return Qnil;
#endif
}
void
init_lapack_cla_lin_berr(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "cla_lin_berr", rblapack_cla_lin_berr, -1);
}
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