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#include "rb_lapack.h"
extern VOID slaqsp_(char* uplo, integer* n, real* ap, real* s, real* scond, real* amax, char* equed);
static VALUE
rblapack_slaqsp(int argc, VALUE *argv, VALUE self){
VALUE rblapack_uplo;
char uplo;
VALUE rblapack_ap;
real *ap;
VALUE rblapack_s;
real *s;
VALUE rblapack_scond;
real scond;
VALUE rblapack_amax;
real amax;
VALUE rblapack_equed;
char equed;
VALUE rblapack_ap_out__;
real *ap_out__;
integer n;
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 equed, ap = NumRu::Lapack.slaqsp( uplo, ap, s, scond, amax, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE SLAQSP( UPLO, N, AP, S, SCOND, AMAX, EQUED )\n\n* Purpose\n* =======\n*\n* SLAQSP equilibrates a symmetric matrix A using the scaling factors\n* in the vector S.\n*\n\n* Arguments\n* =========\n*\n* UPLO (input) CHARACTER*1\n* Specifies whether the upper or lower triangular part of the\n* symmetric matrix A is stored.\n* = 'U': Upper triangular\n* = 'L': Lower triangular\n*\n* N (input) INTEGER\n* The order of the matrix A. N >= 0.\n*\n* AP (input/output) REAL array, dimension (N*(N+1)/2)\n* On entry, the upper or lower triangle of the symmetric matrix\n* A, packed columnwise in a linear array. The j-th column of A\n* is stored in the array AP as follows:\n* if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;\n* if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.\n*\n* On exit, the equilibrated matrix: diag(S) * A * diag(S), in\n* the same storage format as A.\n*\n* S (input) REAL array, dimension (N)\n* The scale factors for A.\n*\n* SCOND (input) REAL\n* Ratio of the smallest S(i) to the largest S(i).\n*\n* AMAX (input) REAL\n* Absolute value of largest matrix entry.\n*\n* EQUED (output) CHARACTER*1\n* Specifies whether or not equilibration was done.\n* = 'N': No equilibration.\n* = 'Y': Equilibration was done, i.e., A has been replaced by\n* diag(S) * A * diag(S).\n*\n* Internal Parameters\n* ===================\n*\n* THRESH is a threshold value used to decide if scaling should be done\n* based on the ratio of the scaling factors. If SCOND < THRESH,\n* scaling is done.\n*\n* LARGE and SMALL are threshold values used to decide if scaling should\n* be done based on the absolute size of the largest matrix element.\n* If AMAX > LARGE or AMAX < SMALL, scaling is done.\n*\n\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n equed, ap = NumRu::Lapack.slaqsp( uplo, ap, s, scond, amax, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 5 && argc != 5)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 5)", argc);
rblapack_uplo = argv[0];
rblapack_ap = argv[1];
rblapack_s = argv[2];
rblapack_scond = argv[3];
rblapack_amax = argv[4];
if (argc == 5) {
} else if (rblapack_options != Qnil) {
} else {
}
uplo = StringValueCStr(rblapack_uplo)[0];
if (!NA_IsNArray(rblapack_s))
rb_raise(rb_eArgError, "s (3th argument) must be NArray");
if (NA_RANK(rblapack_s) != 1)
rb_raise(rb_eArgError, "rank of s (3th argument) must be %d", 1);
n = NA_SHAPE0(rblapack_s);
if (NA_TYPE(rblapack_s) != NA_SFLOAT)
rblapack_s = na_change_type(rblapack_s, NA_SFLOAT);
s = NA_PTR_TYPE(rblapack_s, real*);
amax = (real)NUM2DBL(rblapack_amax);
if (!NA_IsNArray(rblapack_ap))
rb_raise(rb_eArgError, "ap (2th argument) must be NArray");
if (NA_RANK(rblapack_ap) != 1)
rb_raise(rb_eArgError, "rank of ap (2th argument) must be %d", 1);
if (NA_SHAPE0(rblapack_ap) != (n*(n+1)/2))
rb_raise(rb_eRuntimeError, "shape 0 of ap must be %d", n*(n+1)/2);
if (NA_TYPE(rblapack_ap) != NA_SFLOAT)
rblapack_ap = na_change_type(rblapack_ap, NA_SFLOAT);
ap = NA_PTR_TYPE(rblapack_ap, real*);
scond = (real)NUM2DBL(rblapack_scond);
{
na_shape_t shape[1];
shape[0] = n*(n+1)/2;
rblapack_ap_out__ = na_make_object(NA_SFLOAT, 1, shape, cNArray);
}
ap_out__ = NA_PTR_TYPE(rblapack_ap_out__, real*);
MEMCPY(ap_out__, ap, real, NA_TOTAL(rblapack_ap));
rblapack_ap = rblapack_ap_out__;
ap = ap_out__;
slaqsp_(&uplo, &n, ap, s, &scond, &amax, &equed);
rblapack_equed = rb_str_new(&equed,1);
return rb_ary_new3(2, rblapack_equed, rblapack_ap);
}
void
init_lapack_slaqsp(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "slaqsp", rblapack_slaqsp, -1);
}
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