Package org.jruby

Class RubyMath

java.lang.Object

org.jruby.RubyMath

public class RubyMath
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RubyMath.NemesLogGamma	Inner class to help with Γ functions

Field Summary

Fields

Modifier and Type	Field	Description
static final double[]	ASINH_COEF
static final double[]	ATANH_COEF
static final double[]	ERFC_COEF
static final double[]	ERFC2_COEF
static final double[]	ERFCC_COEF

Constructor Summary

Constructors

Constructor	Description
RubyMath()

Method Summary

Modifier and Type	Method	Description
static RubyFloat	acos(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	acosh(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	asin(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	asinh(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	atan(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	atan2(ThreadContext context, IRubyObject recv, IRubyObject x, IRubyObject y)
static RubyFloat	atanh(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	cbrt(ThreadContext context, IRubyObject recv, IRubyObject x)
static double	chebylevSerie(double x, double[] coef)
static RubyFloat	cos(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	cosh(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyModule	createMathModule(ThreadContext context)	Create the Math module and add it to the Ruby runtime.
static RubyFloat	erf(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	erfc(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	exp(ThreadContext context, IRubyObject exponent)
static RubyFloat	exp(ThreadContext context, IRubyObject recv, IRubyObject exponent)
static RubyArray	frexp(ThreadContext context, IRubyObject recv, IRubyObject other)
static RubyFloat	gamma(ThreadContext context, IRubyObject recv, IRubyObject x)	Based on Gergő Nemes's Gamma Function approximation formula, we compute approximate value of Gamma function of x.
static RubyFloat	hypot(ThreadContext context, IRubyObject recv, IRubyObject x, IRubyObject y)
static RubyFloat	hypot19(ThreadContext context, IRubyObject recv, IRubyObject x, IRubyObject y)	Deprecated.
static RubyFloat	ldexp(ThreadContext context, IRubyObject recv, IRubyObject mantissa, IRubyObject exponent)
static RubyArray	lgamma(ThreadContext context, IRubyObject recv, IRubyObject x)	Based on Gergő Nemes's Gamma Function approximation formula, we compute Log Gamma function for real number x.
static RubyFloat	log(ThreadContext context, IRubyObject val)
static RubyFloat	log(ThreadContext context, IRubyObject recv, IRubyObject val)	Returns the natural logarithm of x.
static RubyFloat	log(ThreadContext context, IRubyObject recv, IRubyObject... args)
static RubyFloat	log(ThreadContext context, IRubyObject recv, IRubyObject val, IRubyObject base)
static RubyFloat	log10(ThreadContext context, IRubyObject recv, IRubyObject x)	Returns the base 10 logarithm of x.
static RubyFloat	log2(ThreadContext context, IRubyObject recv, IRubyObject x)	Returns the base 2 logarithm of x.
static double	nemes_gamma(double x)
static double	sign(double x, double y)
static RubyFloat	sin(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	sinh(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	sqrt(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	tan(ThreadContext context, IRubyObject recv, IRubyObject x)
static RubyFloat	tanh(ThreadContext context, IRubyObject recv, IRubyObject x)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

ASINH_COEF

public static final double[] ASINH_COEF

ATANH_COEF

public static final double[] ATANH_COEF

ERFC_COEF

public static final double[] ERFC_COEF

ERFC2_COEF

public static final double[] ERFC2_COEF

ERFCC_COEF

public static final double[] ERFCC_COEF

Constructor Details

RubyMath

public RubyMath()

Method Details

createMathModule

public static RubyModule createMathModule(ThreadContext context)

Create the Math module and add it to the Ruby runtime.

chebylevSerie

public static double chebylevSerie(double x,
 double[] coef)

sign

public static double sign(double x,
 double y)

atan2

public static RubyFloat atan2(ThreadContext context,
 IRubyObject recv,
 IRubyObject x,
 IRubyObject y)

cos

public static RubyFloat cos(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

sin

public static RubyFloat sin(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

tan

public static RubyFloat tan(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

asin

public static RubyFloat asin(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

acos

public static RubyFloat acos(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

atan

public static RubyFloat atan(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

cosh

public static RubyFloat cosh(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

sinh

public static RubyFloat sinh(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

tanh

public static RubyFloat tanh(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

acosh

public static RubyFloat acosh(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

asinh

public static RubyFloat asinh(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

atanh

public static RubyFloat atanh(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

exp

public static RubyFloat exp(ThreadContext context,
 IRubyObject recv,
 IRubyObject exponent)

exp

public static RubyFloat exp(ThreadContext context,
 IRubyObject exponent)

log

public static RubyFloat log(ThreadContext context,
 IRubyObject recv,
 IRubyObject val)

Returns the natural logarithm of x.

log

public static RubyFloat log(ThreadContext context,
 IRubyObject val)

log

public static RubyFloat log(ThreadContext context,
 IRubyObject recv,
 IRubyObject val,
 IRubyObject base)

log

public static RubyFloat log(ThreadContext context,
 IRubyObject recv,
 IRubyObject... args)

log10

public static RubyFloat log10(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

Returns the base 10 logarithm of x.

log2

public static RubyFloat log2(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

Returns the base 2 logarithm of x.

sqrt

public static RubyFloat sqrt(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

cbrt

public static RubyFloat cbrt(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

hypot19

@Deprecated
public static RubyFloat hypot19(ThreadContext context,
 IRubyObject recv,
 IRubyObject x,
 IRubyObject y)

Deprecated.

hypot

public static RubyFloat hypot(ThreadContext context,
 IRubyObject recv,
 IRubyObject x,
 IRubyObject y)

frexp

public static RubyArray frexp(ThreadContext context,
 IRubyObject recv,
 IRubyObject other)

ldexp

public static RubyFloat ldexp(ThreadContext context,
 IRubyObject recv,
 IRubyObject mantissa,
 IRubyObject exponent)

erf

public static RubyFloat erf(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

erfc

public static RubyFloat erfc(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

gamma

public static RubyFloat gamma(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

Based on Gergő Nemes's Gamma Function approximation formula, we compute approximate value of Gamma function of x.

Parameters:

recv - Math module

x - a real number

Returns:

Γ(x) for real number x

See Also:

• New asymptotic expansion for the Γ(x) function

lgamma

public static RubyArray lgamma(ThreadContext context,
 IRubyObject recv,
 IRubyObject x)

Based on Gergő Nemes's Gamma Function approximation formula, we compute Log Gamma function for real number x.

Parameters:

recv - Math module

x - a real number

Returns:

2-element array [ln(Γ(x)), sgn] for real number x, where sgn is the sign of Γ(x) when exponentiated

See Also:

• gamma(ThreadContext, org.jruby.runtime.builtin.IRubyObject, org.jruby.runtime.builtin.IRubyObject)

nemes_gamma

public static double nemes_gamma(double x)