Class: GMP::F

Inherits:
Numeric
  • Object
show all
Defined in:
ext/gmpf.c,
ext/gmp.c,
ext/gmpf.c

Overview

GMP Multiple Precision floating point numbers.

Instances of this class can store variables of the type mpf_t. This class also contains many methods that act as the functions for mpf_t variables, as well as a few methods that attempt to make this library more Ruby-ish.

The following list is just a simple checklist for me, really. A better reference should be found in the rdocs.

Ruby method    C Extension function    GMP function
to_d           r_gmpf_to_d             mpf_get_d
to_s           r_gmpf_to_s             mpf_get_s
+              r_gmpf_add              mpf_add
-              r_gmpf_sub              mpf_sub
*              r_gmpf_mul              mpf_mul
/              r_gmpf_div              mpf_div

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/gmpf.c', line 85

VALUE r_gmpf_initialize(int argc, VALUE *argv, VALUE self)
{
  MP_FLOAT *self_val, *arg_val_f;
  unsigned long prec = 0;
  VALUE arg;

  mpf_get_struct (self, self_val);

  if (argc==0) {
    mpf_init(self_val);
    mpf_set_si(self_val, 0);
    return Qnil;
  }

  arg = argv[0];

  if (argc == 2) {
    if (FIXNUM_P(argv[1])) {
      if (FIX2INT(argv[1]) >= 0)
        prec = FIX2INT(argv[1]);
      else
        rb_raise(rb_eRangeError, "prec must be non-negative");
    } else {
      rb_raise(rb_eTypeError, "prec must be FixNum");
    }
  } else if (GMPF_P(arg)) {
    mpf_get_struct (arg, arg_val_f);
    prec = mpf_get_prec (arg_val_f);
  }
  if (prec == 0)
    mpf_init (self_val);
  else
    mpf_init2 (self_val, prec);

  if (GMPF_P(arg)) {
    mpf_get_struct (arg, arg_val_f);
    mpf_set(self_val, arg_val_f);
  } else {
    mpf_set_value(self_val, arg);
  }

  return Qnil;
}

Class Method Details

.default_prec ⇒ Object 



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# File 'ext/gmp.c', line 104

static VALUE r_gmpfsg_get_default_prec(VALUE klass)
{
  (void)klass;
  return INT2NUM(mpf_get_default_prec());
}

.default_prec=(arg) ⇒ Object 



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# File 'ext/gmp.c', line 110

static VALUE r_gmpfsg_set_default_prec(VALUE klass, VALUE arg)
{
  (void)klass;
  if (FIXNUM_P(arg)) {
    if (FIX2INT(arg) <= 0) {
      rb_raise(rb_eRangeError, "prec must be positive");
    }
    mpf_set_default_prec (FIX2INT(arg));
  } else {
    rb_raise(rb_eTypeError, "prec must be FixNum");
  }
  return Qnil;
}

.GMP::R.new(arg) ⇒ Object

Creates a new GMP::R float, with arg as its value, converting where necessary.



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# File 'ext/gmpf.c', line 69

VALUE r_gmpfsg_new(int argc, VALUE *argv, VALUE klass)
{
  MP_FLOAT *res_val;
  VALUE res;

  (void)klass;

  if (argc > 2)
    rb_raise(rb_eArgError, "wrong # of arguments(%d for 0, 1 or 2)", argc);

  mpf_make_struct (res, res_val);
  rb_obj_call_init(res, argc, argv);

  return res;
}

Instance Method Details

#*(other) ⇒ Object

Returns the product of float and other. other can be

  • GMP::Z

  • Fixnum

  • GMP::Q

  • GMP::F

  • Bignum

  • Float



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# File 'ext/gmpf.c', line 324

VALUE r_gmpf_mul(VALUE self, VALUE arg)
{
  MP_FLOAT *self_val, *res_val, *arg_val_f;
  MP_RAT *arg_val_q;
  MP_INT *arg_val_z;
  VALUE res;
  unsigned long prec;

  mpf_get_struct_prec (self, self_val, prec);

  if (GMPF_P(arg)) {
    mpf_get_struct(arg, arg_val_f);
    prec_max(prec, arg_val_f);
    mpf_make_struct_init(res, res_val, prec);
    mpf_mul(res_val, self_val, arg_val_f);
  } else if (GMPQ_P(arg)) {
    mpq_get_struct(arg, arg_val_q);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_q(res_val, arg_val_q);
    mpf_mul(res_val, self_val, res_val);
  } else if (GMPZ_P(arg)) {
    mpz_get_struct(arg, arg_val_z);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_z(res_val, arg_val_z);
    mpf_mul(res_val, self_val, res_val);
  } else if (FLOAT_P(arg)) {
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_d(res_val, NUM2DBL(arg));
    mpf_mul(res_val, self_val, res_val);
  } else if (FIXNUM_P(arg)) { // _ui with sign control instead ?
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_si(res_val, FIX2INT(arg));
    mpf_mul(res_val, self_val, res_val);
  } else if (BIGNUM_P(arg)) {
    mpz_temp_from_bignum(arg_val_z, arg);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_z(res_val, arg_val_z);
    mpf_mul(res_val, res_val, self_val);
    mpz_temp_free(arg_val_z);
  } else {
    typeerror(ZQFXBD);
  }

  return res;
}

#** ⇒ Object

#+(other) ⇒ Object

Returns the sum of float and other. other can be

  • GMP::Z

  • Fixnum

  • GMP::Q

  • GMP::F

  • Bignum

  • Float



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# File 'ext/gmpf.c', line 208

VALUE r_gmpf_add(VALUE self, VALUE arg)
{
  MP_FLOAT *self_val, *res_val, *arg_val_f;
  MP_RAT *arg_val_q;
  MP_INT *arg_val_z;
  VALUE res;
  unsigned long prec;

  mpf_get_struct_prec (self, self_val, prec);

  if (GMPF_P(arg)) {
    mpf_get_struct (arg, arg_val_f);
    prec_max(prec, arg_val_f);
    mpf_make_struct_init(res, res_val, prec);
    mpf_add(res_val, self_val, arg_val_f);
  } else if (GMPQ_P(arg)) {
    mpq_get_struct (arg, arg_val_q);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_q (res_val, arg_val_q);
    mpf_add (res_val, res_val, self_val);
  } else if (GMPZ_P(arg)) {
    mpz_get_struct (arg, arg_val_z);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_z (res_val, arg_val_z);
    mpf_add (res_val, res_val, self_val);
  } else if (FLOAT_P(arg)) {
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_d (res_val, NUM2DBL(arg));
    mpf_add (res_val, res_val, self_val);
  } else if (FIXNUM_P(arg)) { // _ui with sign control instead ?
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_si (res_val, FIX2INT(arg));
    mpf_add (res_val, res_val, self_val);
  } else if (BIGNUM_P(arg)) {
    mpz_temp_from_bignum(arg_val_z, arg);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_z (res_val, arg_val_z);
    mpf_add (res_val, res_val, self_val);
    mpz_temp_free(arg_val_z);
  } else {
    typeerror(ZQFXBD);
  }

  return res;
}

#-(float2) ⇒ Object

Subtracts float2 from float1. float2 can be

  • GMP::Z

  • Fixnum

  • GMP::Q

  • GMP::F

  • Bignum

  • Float



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# File 'ext/gmpf.c', line 266

VALUE r_gmpf_sub(VALUE self, VALUE arg)
{
  MP_FLOAT *self_val, *res_val, *arg_val_f;
  MP_RAT *arg_val_q;
  MP_INT *arg_val_z;
  VALUE res;
  unsigned long prec;

  mpf_get_struct_prec (self, self_val, prec);

  if (GMPF_P(arg)) {
    mpf_get_struct(arg, arg_val_f);
    prec_max(prec, arg_val_f);
    mpf_make_struct_init(res, res_val, prec);
    mpf_sub(res_val, self_val, arg_val_f);
  } else if (GMPQ_P(arg)) {
    mpq_get_struct(arg, arg_val_q);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_q(res_val, arg_val_q);
    mpf_sub(res_val, self_val, res_val);
  } else if (GMPZ_P(arg)) {
    mpz_get_struct(arg, arg_val_z);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_z(res_val, arg_val_z);
    mpf_sub(res_val, self_val, res_val);
  } else if (FLOAT_P(arg)) {
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_d(res_val, NUM2DBL(arg));
    mpf_sub(res_val, self_val, res_val);
  } else if (FIXNUM_P(arg)) { // _ui with sign control instead ?
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_si(res_val, FIX2INT(arg));
    mpf_sub(res_val, self_val, res_val);
  } else if (BIGNUM_P(arg)) {
    mpz_temp_from_bignum(arg_val_z, arg);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_z(res_val, arg_val_z);
    mpf_sub(res_val, self_val, res_val);
    mpz_temp_free(arg_val_z);
  } else {
    typeerror(ZQFXBD);
  }

  return res;
}

#-@ ⇒ Object

#/(float2) ⇒ Object

Divides float1 by float2. float2 can be

  • GMP::Z

  • Fixnum

  • GMP::Q

  • GMP::F

  • Bignum

  • Float



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# File 'ext/gmpf.c', line 382

VALUE r_gmpf_div(VALUE self, VALUE arg)
{
  MP_FLOAT *self_val, *res_val, *arg_val_f;
  MP_RAT *arg_val_q;
  MP_INT *arg_val_z;
  VALUE res;
  unsigned long prec;

  mpf_get_struct_prec (self, self_val, prec);

  if (GMPF_P(arg)) {
    mpf_get_struct(arg, arg_val_f);
    prec_max(prec, arg_val_f);
    mpf_make_struct_init(res, res_val, prec);
    mpf_div(res_val, self_val, arg_val_f);
  } else if (GMPQ_P(arg)) {
    mpq_get_struct(arg, arg_val_q);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_q(res_val, arg_val_q);
    mpf_div(res_val, self_val, res_val);
  } else if (GMPZ_P(arg)) {
    mpz_get_struct(arg, arg_val_z);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_z(res_val, arg_val_z);
    mpf_div(res_val, self_val, res_val);
  } else if (FLOAT_P(arg)) {
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_d(res_val, NUM2DBL(arg));
    mpf_div(res_val, self_val, res_val);
  } else if (FIXNUM_P(arg)) { // _ui with sign control instead ?
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_si(res_val, FIX2INT(arg));
    mpf_div(res_val, self_val, res_val);
  } else if (BIGNUM_P(arg)) {
    mpz_temp_from_bignum(arg_val_z, arg);
    mpf_make_struct_init(res, res_val, prec);
    mpf_set_z(res_val, arg_val_z);
    mpf_div(res_val, self_val, res_val);	
    mpz_temp_free(arg_val_z);
  } else {
    typeerror(ZQFXBD);
  }

  return res;
}

#< ⇒ Object

#<= ⇒ Object

#<=>(arg) ⇒ Object

Float Comparison



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# File 'ext/gmpf.c', line 498

VALUE r_gmpf_cmp(VALUE self, VALUE arg)
{
  MP_FLOAT *self_val;
  int res;
  mpf_get_struct(self,self_val);
  res = mpf_cmp_value(self_val, arg);
  if (res > 0)
    return INT2FIX(1);
  else if (res == 0)
    return INT2FIX(0);
  else
    return INT2FIX(-1);
}

#==(arg) ⇒ Object

what does really “equal” mean ? it’s not obvious



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# File 'ext/gmpf.c', line 491

VALUE r_gmpf_eq(VALUE self, VALUE arg)
{
  MP_FLOAT *self_val;
  mpf_get_struct (self,self_val);
  return (mpf_cmp_value(self_val, arg) == 0) ? Qtrue : Qfalse;
}

#> ⇒ Object

#>= ⇒ Object

#abs ⇒ Object

call-seq:

float.abs

From the GMP Manual:

Returns the absolute value of float.

#abs! ⇒ Object

call-seq:

float.abs!

Sets float to the absolute value of float.

#acos ⇒ Object

#acosh ⇒ Object

#asin ⇒ Object

#asinh ⇒ Object

#atan ⇒ Object

#atanh ⇒ Object

#ceil ⇒ Object

#ceil! ⇒ Object

#coerce(arg) ⇒ Object

new method - testing



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# File 'ext/gmp.c', line 99

static VALUE r_gmpf_coerce(VALUE self, VALUE arg)
{
  return rb_assoc_new(r_gmpfsg_new(1, &arg, cGMP_F), self);
}

#cos ⇒ Object

#cosh ⇒ Object

#exp ⇒ Object

#expm1 ⇒ Object

#finite? ⇒ Boolean

Returns:

  • (Boolean)

#floor ⇒ Object

unsorted

#floor! ⇒ Object

#infinite? ⇒ Boolean

Returns:

  • (Boolean)

#log ⇒ Object

#log10 ⇒ Object

#log1p ⇒ Object

#log2 ⇒ Object

#nan? ⇒ Boolean

Returns:

  • (Boolean)

#neg! ⇒ Object

call-seq:

float.neg!

Sets float to -float.

#number? ⇒ Boolean

Returns:

  • (Boolean)

#prec ⇒ Object 



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# File 'ext/gmpf.c', line 541

VALUE r_gmpf_get_prec(VALUE self)
{
  MP_FLOAT *self_val;
  mpf_get_struct(self, self_val);
  return INT2NUM(mpf_get_prec(self_val));
}

#sgn ⇒ Object

#sin ⇒ Object

#sinh ⇒ Object

#sqrt ⇒ Object

#tan ⇒ Object

#tanh ⇒ Object

#to_d ⇒ Object Also known as: to_f

********************************************************************

Converting Floats                                               *

********************************************************************



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# File 'ext/gmpf.c', line 146

VALUE r_gmpf_to_d(VALUE self)
{
  MP_FLOAT *self_val;
  mpf_get_struct(self, self_val);

  return rb_float_new(mpf_get_d(self_val));
}

#to_s ⇒ Object

call-seq:

float.to_s

Returns the decimal representation of float, as a string.



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# File 'ext/gmpf.c', line 162

VALUE r_gmpf_to_s(VALUE self)
{
  MP_FLOAT *self_val;
  char *str, *str2;
  VALUE res;
  mp_exp_t exponent;

  mpf_get_struct(self, self_val);

  str = mpf_get_str(NULL, &exponent, 10, 0, self_val);
  if ((strcmp(str,  "NaN") == 0) ||
      (strcmp(str,  "Inf") == 0) ||
      (strcmp(str, "-Inf") == 0))
  {
    res = rb_str_new2(str);
  }
  else
  {
    if (str[0] == '-')
      __gmp_asprintf(&str2, "-0.%se%+ld", str+1, exponent);
    else
      __gmp_asprintf(&str2, "0.%se%+ld", str, exponent);
    res = rb_str_new2(str2);
    free(str2);
  }
  free(str);
  return res;
}

#trunc ⇒ Object

#trunc! ⇒ Object