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#include "rb_lapack.h"
extern VOID dlabad_(doublereal* small, doublereal* large);
static VALUE
rblapack_dlabad(int argc, VALUE *argv, VALUE self){
VALUE rblapack_small;
doublereal small;
VALUE rblapack_large;
doublereal large;
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 small, large = NumRu::Lapack.dlabad( small, large, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE DLABAD( SMALL, LARGE )\n\n* Purpose\n* =======\n*\n* DLABAD takes as input the values computed by DLAMCH for underflow and\n* overflow, and returns the square root of each of these values if the\n* log of LARGE is sufficiently large. This subroutine is intended to\n* identify machines with a large exponent range, such as the Crays, and\n* redefine the underflow and overflow limits to be the square roots of\n* the values computed by DLAMCH. This subroutine is needed because\n* DLAMCH does not compensate for poor arithmetic in the upper half of\n* the exponent range, as is found on a Cray.\n*\n\n* Arguments\n* =========\n*\n* SMALL (input/output) DOUBLE PRECISION\n* On entry, the underflow threshold as computed by DLAMCH.\n* On exit, if LOG10(LARGE) is sufficiently large, the square\n* root of SMALL, otherwise unchanged.\n*\n* LARGE (input/output) DOUBLE PRECISION\n* On entry, the overflow threshold as computed by DLAMCH.\n* On exit, if LOG10(LARGE) is sufficiently large, the square\n* root of LARGE, otherwise unchanged.\n*\n\n* =====================================================================\n*\n* .. Intrinsic Functions ..\n INTRINSIC LOG10, SQRT\n* ..\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n small, large = NumRu::Lapack.dlabad( small, large, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 2 && argc != 2)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 2)", argc);
rblapack_small = argv[0];
rblapack_large = argv[1];
if (argc == 2) {
} else if (rblapack_options != Qnil) {
} else {
}
small = NUM2DBL(rblapack_small);
large = NUM2DBL(rblapack_large);
dlabad_(&small, &large);
rblapack_small = rb_float_new((double)small);
rblapack_large = rb_float_new((double)large);
return rb_ary_new3(2, rblapack_small, rblapack_large);
}
void
init_lapack_dlabad(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "dlabad", rblapack_dlabad, -1);
}
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