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#include "include/rb_gsl.h"
#include "gsl/gsl_bspline.h"
static VALUE cBSWS;
static VALUE rb_gsl_bspline_alloc(VALUE klass, VALUE k, VALUE n)
{
gsl_bspline_workspace *w;
w = gsl_bspline_alloc(FIX2INT(k), FIX2INT(n));
return Data_Wrap_Struct(klass, 0, gsl_bspline_free, w);
}
static VALUE rb_gsl_bspline_ncoeffs(VALUE obj)
{
gsl_bspline_workspace *w;
Data_Get_Struct(obj, gsl_bspline_workspace, w);
return INT2FIX((int)gsl_bspline_ncoeffs(w));
}
static VALUE rb_gsl_bspline_order(VALUE obj)
{
gsl_bspline_workspace *w;
Data_Get_Struct(obj, gsl_bspline_workspace, w);
return INT2FIX((int)gsl_bspline_order(w));
}
static VALUE rb_gsl_bspline_nbreak(VALUE obj)
{
gsl_bspline_workspace *w;
Data_Get_Struct(obj, gsl_bspline_workspace, w);
return INT2FIX((int)gsl_bspline_nbreak(w));
}
static VALUE rb_gsl_bspline_breakpoint(VALUE obj, VALUE i)
{
gsl_bspline_workspace *w;
Data_Get_Struct(obj, gsl_bspline_workspace, w);
return rb_float_new(gsl_bspline_breakpoint(FIX2INT(i), w));
}
static VALUE rb_gsl_bspline_knots(VALUE obj, VALUE b)
{
gsl_bspline_workspace *w;
Data_Get_Struct(obj, gsl_bspline_workspace, w);
#ifdef HAVE_NMATRIX_H
if (NM_IsNMatrix(b)) {
NM_DENSE_STORAGE *nm_bpts;
gsl_vector_view v;
nm_bpts = NM_STORAGE_DENSE(b);
v = gsl_vector_view_array((double*) nm_bpts->elements, NM_DENSE_COUNT(b));
gsl_bspline_knots(&v.vector, w);
return Data_Wrap_Struct(cgsl_vector_view_ro, 0, NULL, w->knots);
}
#endif
gsl_vector *bpts;
CHECK_VECTOR(b);
Data_Get_Struct(b, gsl_vector, bpts);
gsl_bspline_knots(bpts, w);
return Data_Wrap_Struct(cgsl_vector_view_ro, 0, NULL, w->knots);
}
static VALUE rb_gsl_bspline_knots_uniform(int argc, VALUE *argv, VALUE obj)
{
gsl_bspline_workspace *w;
int argc2;
switch (TYPE(obj)) {
case T_MODULE:
case T_CLASS:
case T_OBJECT:
if (!rb_obj_is_kind_of(argv[argc-1], cBSWS)) {
rb_raise(rb_eTypeError, "Wrong argument type %s (GSL::BSpline expected)",
rb_class2name(CLASS_OF(argv[argc-1])));
}
Data_Get_Struct(argv[argc-1], gsl_bspline_workspace, w);
argc2 = argc-1;
break;
default:
Data_Get_Struct(obj, gsl_bspline_workspace, w);
argc2 = argc;
}
if (argc2 != 2) rb_raise(rb_eArgError, "Wrong number of arguments.");
gsl_bspline_knots_uniform(NUM2DBL(argv[0]), NUM2DBL(argv[1]), w);
return Data_Wrap_Struct(cgsl_vector_view_ro, 0, NULL, w->knots);
}
static VALUE rb_gsl_bspline_eval(int argc, VALUE *argv, VALUE obj)
{
gsl_bspline_workspace *w;
double x;
gsl_vector *B;
VALUE vB;
Data_Get_Struct(obj, gsl_bspline_workspace, w);
switch (argc) {
case 2:
CHECK_VECTOR(argv[1]);
Data_Get_Struct(argv[1], gsl_vector, B);
vB = argv[1];
x = NUM2DBL(argv[0]);
break;
case 1:
x = NUM2DBL(argv[0]);
B = gsl_vector_alloc(w->nbreak+w->k-2);
vB = Data_Wrap_Struct(cgsl_vector, 0, gsl_vector_free, B);
break;
default:
rb_raise(rb_eArgError, "Wrong number of arguments (%d for 1 or 2)", argc);
}
gsl_bspline_eval(x, B, w);
return vB;
}
static VALUE rb_gsl_bspline_greville_abscissa(VALUE obj, VALUE i)
{
gsl_bspline_workspace *w;
Data_Get_Struct(obj, gsl_bspline_workspace, w);
return rb_float_new(gsl_bspline_greville_abscissa(i, w));
}
void Init_bspline(VALUE module)
{
cBSWS = rb_define_class_under(module, "BSpline", cGSL_Object);
rb_define_singleton_method(cBSWS, "alloc", rb_gsl_bspline_alloc, 2);
rb_define_method(cBSWS, "ncoeffs", rb_gsl_bspline_ncoeffs, 0);
rb_define_method(cBSWS, "order", rb_gsl_bspline_order, 0);
rb_define_method(cBSWS, "nbreak", rb_gsl_bspline_nbreak, 0);
rb_define_method(cBSWS, "breakpoint", rb_gsl_bspline_breakpoint, 1);
rb_define_method(cBSWS, "knots", rb_gsl_bspline_knots, 1);
rb_define_method(cBSWS, "knots_uniform", rb_gsl_bspline_knots_uniform, -1);
rb_define_singleton_method(cBSWS, "knots_uniform", rb_gsl_bspline_knots_uniform, -1);
rb_define_method(cBSWS, "eval", rb_gsl_bspline_eval, -1);
rb_define_method(cBSWS, "greville_abscissa", rb_gsl_bspline_greville_abscissa, 1);
}
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