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/*
spline2d.c
Ruby/GSL: Ruby extension library for GSL (GNU Scientific Library)
(C) Copyright 2001-2006 by Yoshiki Tsunesada
Ruby/GSL is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY.
*/
#ifdef GSL_2_0_LATER
#include "include/rb_gsl_interp2d.h"
extern VALUE cgsl_interp2d_accel; /* defined in interp2d.c */
static void rb_gsl_spline2d_free(rb_gsl_spline2d *fr);
static VALUE rb_gsl_spline2d_alloc(int argc, VALUE *argv, VALUE self)
{
rb_gsl_spline2d *sp = NULL;
const gsl_interp2d_type *T = NULL;
double *xptr = NULL, *yptr = NULL, *zptr = NULL;
size_t sizex = 0, sizey = 0, sizez = 0, stride = 1;
T = get_interp2d_type(argv[0]);
if (argc == 3) { // type, sizex, sizey
sizex = FIX2INT(argv[1]);
sizey = FIX2INT(argv[2]);
}
else if (argc == 4) { // type, xarr, yarr, zarr
xptr = get_vector_ptr(argv[1], &stride, &sizex);
yptr = get_vector_ptr(argv[2], &stride, &sizey);
zptr = get_vector_ptr(argv[3], &stride, &sizez);
}
else {
rb_raise(rb_eRuntimeError, "Expected args: (interp2d type, xn, yn) \
or (interp2d type, xarr, yarr, zarr");
}
if (sizex == 0 || sizey == 0) rb_raise(rb_eRuntimeError, "Spline2d size not given.");
sp = ALLOC(rb_gsl_spline2d);
sp->s = gsl_spline2d_alloc(T, sizex, sizey);
sp->xacc = gsl_interp_accel_alloc();
sp->yacc = gsl_interp_accel_alloc();
if (xptr && yptr && zptr) gsl_spline2d_init(sp->s, xptr, yptr, zptr, sizex, sizey);
return Data_Wrap_Struct(self, 0, rb_gsl_spline2d_free, sp);
}
static void rb_gsl_spline2d_free(rb_gsl_spline2d *fr)
{
gsl_spline2d_free(fr->s);
gsl_interp_accel_free(fr->xacc);
gsl_interp_accel_free(fr->yacc);
free((rb_gsl_interp2d*) fr);
}
static VALUE rb_gsl_spline2d_init(VALUE self, VALUE xarr, VALUE yarr, VALUE zarr)
{
rb_gsl_spline2d *rgs = NULL;
double *xptr = NULL, *yptr = NULL, *zptr = NULL;
size_t xsize, ysize, zsize, stride;
xptr = get_vector_ptr(xarr, &stride, &xsize);
yptr = get_vector_ptr(yarr, &stride, &ysize);
zptr = get_vector_ptr(zarr, &stride, &zsize);
Data_Get_Struct(self, rb_gsl_spline2d, rgs);
gsl_spline2d_init(rgs->s, xptr, yptr, zptr, xsize, ysize);
return self;
}
static VALUE rb_gsl_spline2d_accel(VALUE self)
{
rb_gsl_spline2d *rgs = NULL;
VALUE ary = rb_ary_new();
Data_Get_Struct(self, rb_gsl_spline2d, rgs);
rb_ary_push(ary, Data_Wrap_Struct(cgsl_interp2d_accel, 0, NULL, rgs->xacc));
rb_ary_push(ary, Data_Wrap_Struct(cgsl_interp2d_accel, 0, NULL, rgs->yacc));
return ary;
}
static VALUE rb_gsl_spline2d_evaluate(VALUE self, VALUE xx, VALUE yy,
double (*eval)(const gsl_spline2d *, double, double, gsl_interp_accel *,
gsl_interp_accel *))
{
VALUE is_swapped = rb_cvar_get(CLASS_OF(self), rb_intern("@@swapped"));
VALUE temp;
if (is_swapped != Qnil && is_swapped == Qtrue) {
temp = xx;
xx = yy;
yy = temp;
}
rb_gsl_spline2d *rgs = NULL;
gsl_vector *vx = NULL, *vy = NULL, *vnew = NULL;
gsl_matrix *mx = NULL, *my = NULL, *mnew = NULL;
VALUE ary, x, y;
double val;
size_t i, j;
Data_Get_Struct(self, rb_gsl_spline2d, rgs);
if (CLASS_OF(xx) == rb_cRange) xx = rb_gsl_range2ary(xx);
if (CLASS_OF(yy) == rb_cRange) yy = rb_gsl_range2ary(yy);
if (TYPE(xx) != TYPE(yy)) {
rb_raise(rb_eTypeError,"xx and yy must be same type. xx = %d yy = %d.",
TYPE(xx), TYPE(yy));
}
switch (TYPE(xx)) {
case T_FIXNUM: case T_BIGNUM: case T_FLOAT:
Need_Float(xx);
return rb_float_new((*eval)(rgs->s, NUM2DBL(xx), NUM2DBL(yy),
rgs->xacc, rgs->yacc));
case T_ARRAY:
if (RARRAY_LEN(xx) != RARRAY_LEN(yy)) {
rb_raise(rb_eRuntimeError, "xx and yy must be same sized Array.");
}
ary = rb_ary_new2(RARRAY_LEN(xx));
for (i = 0; i < (unsigned)RARRAY_LEN(xx); i++) {
x = rb_ary_entry(xx, i);
y = rb_ary_entry(yy, i);
Need_Float(x);
Need_Float(y);
val = (*eval)(rgs->s, NUM2DBL(x), NUM2DBL(y), rgs->xacc, rgs->yacc);
rb_ary_store(ary, i, rb_float_new(val));
}
return ary;
default:
if (VECTOR_P(xx)) {
Data_Get_Struct(xx, gsl_vector, vx);
Data_Get_Struct(yy, gsl_vector, vy);
if (vx->size != vy->size) {
rb_raise(rb_eRuntimeError, "xx and yy must be same size Vectors.");
}
vnew = gsl_vector_alloc(vx->size);
for (i = 0; i < vx->size; i++) {
val = (*eval)(rgs->s, gsl_vector_get(vx, i), gsl_vector_get(vy, i),
rgs->xacc, rgs->yacc);
gsl_vector_set(vnew, i, val);
}
return Data_Wrap_Struct(cgsl_vector, 0, gsl_vector_free, vnew);
} else if (MATRIX_P(xx)) {
Data_Get_Struct(xx, gsl_matrix, mx);
Data_Get_Struct(xx, gsl_matrix, my);
if ((mx->size1 != my->size1) || (mx->size2 != my->size2)) {
rb_raise(rb_eRuntimeError, "xx and yy must be same sized Matrices.");
}
mnew = gsl_matrix_alloc(mx->size1, mx->size2);
for (i = 0; i < mx->size1; i++) {
for (j = 0; j < mx->size2; j++) {
val = (*eval)(rgs->s, gsl_matrix_get(mx, i, j),
gsl_matrix_get(my, i, j), rgs->xacc, rgs->yacc);
gsl_matrix_set(mnew, i, j, val);
}
}
return Data_Wrap_Struct(cgsl_matrix, 0, gsl_matrix_free, mnew);
} else {
rb_raise(rb_eTypeError, "wrong argument type %s", rb_class2name(CLASS_OF(xx)));
}
}
}
static VALUE rb_gsl_spline2d_eval(VALUE self, VALUE xx, VALUE yy)
{
return rb_gsl_spline2d_evaluate(self, xx, yy, gsl_spline2d_eval);
}
static VALUE rb_gsl_spline2d_info(VALUE self)
{
rb_gsl_spline2d *p = NULL;
char buf[256];
Data_Get_Struct(self, rb_gsl_spline2d, p);
snprintf(buf, sizeof(buf) - 1,
"Class: %s\n"
"SuperClass: %s\n"
"Type: %s\n"
"xmin: %f\n"
"xmax: %f\n"
"ymin: %f\n"
"ymax: %f\n"
"xSize: %d\n"
"ySize: %d\n",
rb_class2name(CLASS_OF(self)),
rb_class2name(RCLASS_SUPER(CLASS_OF(self))),
gsl_interp2d_name(&p->s->interp_object),
p->s->interp_object.xmin,
p->s->interp_object.xmax,
p->s->interp_object.ymin,
p->s->interp_object.ymax,
(int) p->s->interp_object.xsize,
(int) p->s->interp_object.ysize);
buf[sizeof(buf) - 1] = '\0';
return rb_str_new2(buf);
}
void Init_gsl_spline2d(VALUE module)
{
VALUE cgsl_spline2d;
cgsl_spline2d = rb_define_class_under(module, "Spline2d", cGSL_Object);
rb_define_singleton_method(cgsl_spline2d, "alloc", rb_gsl_spline2d_alloc, -1);
/*****/
rb_define_method(cgsl_spline2d, "init", rb_gsl_spline2d_init, 3);
rb_define_method(cgsl_spline2d, "accel", rb_gsl_spline2d_accel, 0);
rb_define_method(cgsl_spline2d, "eval", rb_gsl_spline2d_eval, 2);
rb_define_alias(cgsl_spline2d, "[]", "eval");
rb_define_method(cgsl_spline2d, "info", rb_gsl_spline2d_info, 0);
}
#endif
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