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/*
* Ruby interface for ALF, a library to calculate associated Legendre functions by Patrick Alken
* Based on ALF-0.1
*/
#ifdef HAVE_ALF_ALF_H
#include "rb_gsl.h"
static VALUE cWspace;
static VALUE rb_alf_alloc(VALUE klass, VALUE lmax)
{
alf_workspace *w = NULL;
w = alf_alloc(FIX2INT(lmax));
return Data_Wrap_Struct(cWspace, 0, alf_free, w);
}
static VALUE rb_alf_params(VALUE obj, VALUE csphase, VALUE cnorm, VALUE norm)
{
alf_workspace *w;
int ret;
Data_Get_Struct(obj, alf_workspace, w);
ret = alf_params(FIX2INT(csphase), FIX2INT(cnorm), (alf_norm_t) FIX2INT(norm), w);
return INT2FIX(ret);
}
static void define_constants(VALUE klass)
{
rb_define_const(klass, "NORM_NONE", INT2FIX((int) ALF_NORM_NONE));
rb_define_const(klass, "NORM_SPHARM", INT2FIX((int) ALF_NORM_SPHARM));
rb_define_const(klass, "NORM_ORTHO", INT2FIX((int) ALF_NORM_ORTHO));
rb_define_const(klass, "NORM_SCHMIDT", INT2FIX((int) ALF_NORM_SCHMIDT));
}
/**
* arguments:
* - Plm_array(x) : lmax = w->lmax, A new vector is created
* - Plm_array(x, result) : lmax = w->lmax, the given vector is used
* - Plm_array(lmax, x) : A new vector is created
* - Plm_array(lmax, x, result) : Same as C Plm_array()
* - Plm_array(x, result, deriv) : lmax = w->lmax, calcurate Plm_deriv_array(lmax, x, result, deriv)
* - Plm_array(lmax, x, result, deriv) : Same as C alf_Plm_deriv_array
*/
static VALUE rb_alf_Plm_array(int argc, VALUE *argv, VALUE obj)
{
alf_workspace *w = NULL;
gsl_vector *res = NULL, *deriv = NULL;
int lmax;
double x;
VALUE ret;
Data_Get_Struct(obj, alf_workspace, w);
switch (argc) {
case 1:
x = NUM2DBL(argv[0]);
lmax = w->lmax;
res = gsl_vector_alloc(alf_array_size(lmax));
ret = Data_Wrap_Struct(cgsl_vector, 0, gsl_vector_free, res);
break;
case 2: // Plm_array(x, result) or Plm_array(lmax, x)
if (VECTOR_P(argv[1])) {
x = NUM2DBL(argv[0]);
Data_Get_Struct(argv[1], gsl_vector, res);
lmax = w->lmax;
if (res->size < alf_array_size(lmax)) {
rb_raise(rb_eRuntimeError, "Vector length is too small. (%d for >= %d\n", (int) res->size,
(int) alf_array_size(lmax));
}
ret = argv[1];
} else {
lmax = FIX2INT(argv[0]);
x = NUM2DBL(argv[1]);
res = gsl_vector_alloc(alf_array_size(lmax));
ret = Data_Wrap_Struct(cgsl_vector, 0, gsl_vector_free, res);
}
break;
case 3: // Plm_array(lmax, x, result) or Plm_array(x, result, deriv)
if (VECTOR_P(argv[1])) {
CHECK_VECTOR(argv[2]);
lmax = w->lmax;
x = NUM2DBL(argv[0]);
Data_Get_Struct(argv[1], gsl_vector, res);
Data_Get_Struct(argv[2], gsl_vector, deriv);
ret = argv[1];
} else {
lmax = FIX2INT(argv[0]);
x = NUM2DBL(argv[1]);
CHECK_VECTOR(argv[2]);
Data_Get_Struct(argv[2], gsl_vector, res);
if (res->size < alf_array_size(lmax)) {
rb_raise(rb_eRuntimeError, "Vector length is too small. (%d for >= %d\n", (int) res->size,
(int) alf_array_size(lmax));
}
ret = argv[2];
}
break;
case 4:
CHECK_VECTOR(argv[2]); CHECK_VECTOR(argv[3])
lmax = FIX2INT(argv[0]);
x = NUM2DBL(argv[1]);
Data_Get_Struct(argv[2], gsl_vector, res);
Data_Get_Struct(argv[3], gsl_vector, deriv);
ret = argv[2];
break;
default:
rb_raise(rb_eArgError, "Wrong number of argumentso (%d for 1-3)\n", argc);
}
if (argc == 4 && deriv != NULL) alf_Plm_deriv_array(lmax, x, res->data, deriv->data, w);
else alf_Plm_array(lmax, x, res->data, w);
return ret;
}
/**
* arguments:
* - Plm_deriv_array(x) : lmax = w->lmax, two new vectors are created and returned as an array
* - Plm_array(lmax, x) : Two new vectors are created and returned as an array
* - Plm_array(lmax, x, result, deriv) : Same as C alf_Plm_deriv_array()
*/
static VALUE rb_alf_Plm_deriv_array(int argc, VALUE *argv, VALUE obj)
{
alf_workspace *w = NULL;
gsl_vector *res = NULL, *deriv = NULL;
int lmax;
double x;
VALUE ret1, ret2, ary;
Data_Get_Struct(obj, alf_workspace, w);
switch (argc) {
case 1:
x = NUM2DBL(argv[0]);
lmax = w->lmax;
res = gsl_vector_alloc(alf_array_size(lmax));
deriv = gsl_vector_alloc(alf_array_size(lmax));
ret1 = Data_Wrap_Struct(cgsl_vector, 0, gsl_vector_free, res);
ret2 = Data_Wrap_Struct(cgsl_vector, 0, gsl_vector_free, deriv);
break;
case 2:
lmax = FIX2INT(argv[1]);
x = NUM2DBL(argv[1]);
res = gsl_vector_alloc(alf_array_size(lmax));
deriv = gsl_vector_alloc(alf_array_size(lmax));
ret1 = Data_Wrap_Struct(cgsl_vector, 0, gsl_vector_free, res);
ret2 = Data_Wrap_Struct(cgsl_vector, 0, gsl_vector_free, deriv);
break;
case 3:
CHECK_VECTOR(argv[1]);
CHECK_VECTOR(argv[2]);
ret1 = argv[1];
ret2 = argv[2];
lmax = w->lmax;
x = NUM2DBL(argv[0]);
break;
case 4:
lmax = FIX2INT(argv[0]);
x = NUM2DBL(argv[1]);
CHECK_VECTOR(argv[2]);
CHECK_VECTOR(argv[3]);
Data_Get_Struct(argv[2], gsl_vector, res);
Data_Get_Struct(argv[3], gsl_vector, deriv);
if (res->size < alf_array_size(lmax)) {
rb_raise(rb_eRuntimeError, "Vector length is too small. (%d for >= %d\n", (int) res->size,
(int) alf_array_size(lmax));
}
if (deriv->size < alf_array_size(lmax)) {
rb_raise(rb_eRuntimeError, "Vector length is too small. (%d for >= %d\n", (int) res->size,
(int) alf_array_size(lmax));
}
ret1 = argv[2];
ret2 = argv[3];
break;
default:
rb_raise(rb_eArgError, "Wrong number of argumentso (%d for 1-4)\n", argc);
}
alf_Plm_deriv_array(lmax, x, res->data, deriv->data, w);
ary = rb_ary_new2(2);
rb_ary_store(ary, 0, ret1);
rb_ary_store(ary, 1, ret2);
return ary;
}
static VALUE rb_alf_array_size(VALUE module, VALUE lmax)
{
return INT2FIX(alf_array_size(FIX2INT(lmax)));
}
static VALUE rb_alf_array_index(VALUE module, VALUE l, VALUE m)
{
return INT2FIX(alf_array_index(FIX2INT(l), FIX2INT(m)));
}
void Init_alf(VALUE module)
{
VALUE mALF;
mALF = rb_define_module_under(module, "ALF");
cWspace = rb_define_class_under(mALF, "Workspace", cGSL_Object);
rb_define_singleton_method(cWspace, "alloc", rb_alf_alloc, 1);
rb_define_singleton_method(mALF, "alloc", rb_alf_alloc, 1);
rb_define_module_function(module, "alf_alloc", rb_alf_alloc, 1);
rb_define_method(cWspace, "params", rb_alf_params, 3);
rb_define_method(cWspace, "Plm_array", rb_alf_Plm_array, -1);
rb_define_method(cWspace, "Plm_deriv_array", rb_alf_Plm_deriv_array, -1);
rb_define_module_function(mALF, "array_size", rb_alf_array_size, 1);
rb_define_module_function(mALF, "array_index", rb_alf_array_index, 2);
define_constants(mALF);
}
#endif
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