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##
# = CMath
#
# CMath is a library that provides trigonometric and transcendental
# functions for complex numbers.
#
# == Usage
#
# To start using this library, simply:
#
# require "cmath"
#
# Square root of a negative number is a complex number.
#
# CMath.sqrt(-9) #=> 0+3.0i
#
module CMath
include Math
alias exp! exp
alias log! log
alias log2! log2
alias log10! log10
alias sqrt! sqrt
alias cbrt! cbrt
alias sin! sin
alias cos! cos
alias tan! tan
alias sinh! sinh
alias cosh! cosh
alias tanh! tanh
alias asin! asin
alias acos! acos
alias atan! atan
alias atan2! atan2
alias asinh! asinh
alias acosh! acosh
alias atanh! atanh
##
# Math::E raised to the +z+ power
#
# exp(Complex(0,0)) #=> 1.0+0.0i
# exp(Complex(0,PI)) #=> -1.0+1.2246467991473532e-16i
# exp(Complex(0,PI/2.0)) #=> 6.123233995736766e-17+1.0i
def exp(z)
if z.real?
exp!(z)
else
ere = exp!(z.real)
Complex(ere * cos!(z.imag),
ere * sin!(z.imag))
end
end
##
# Returns the natural logarithm of Complex. If a second argument is given,
# it will be the base of logarithm.
#
# log(Complex(0,0)) #=> -Infinity+0.0i
def log(*args)
z, b = args
if z.real? and z >= 0 and (b.nil? or b >= 0)
log!(*args)
else
a = Complex(log!(z.abs), z.arg)
if b
a /= log(b)
end
a
end
end
##
# returns the base 2 logarithm of +z+
def log2(z)
if z.real? and z >= 0
log2!(z)
else
log(z) / log!(2)
end
end
##
# returns the base 10 logarithm of +z+
def log10(z)
if z.real? and z >= 0
log10!(z)
else
log(z) / log!(10)
end
end
##
# Returns the non-negative square root of Complex.
# sqrt(-1) #=> 0+1.0i
# sqrt(Complex(-1,0)) #=> 0.0+1.0i
# sqrt(Complex(0,8)) #=> 2.0+2.0i
def sqrt(z)
if z.real?
if z < 0
Complex(0, sqrt!(-z))
else
sqrt!(z)
end
else
if z.imag < 0 ||
(z.imag == 0 && z.imag.to_s[0] == '-')
sqrt(z.conjugate).conjugate
else
r = z.abs
x = z.real
Complex(sqrt!((r + x) / 2.0), sqrt!((r - x) / 2.0))
end
end
end
##
# returns the cube root of +z+
def cbrt(z)
if z.real?
cbrt!(z)
else
Complex(z) ** (1.0/3)
end
end
##
# returns the sine of +z+, where +z+ is given in radians
def sin(z)
if z.real?
sin!(z)
else
Complex(sin!(z.real) * cosh!(z.imag),
cos!(z.real) * sinh!(z.imag))
end
end
##
# returns the cosine of +z+, where +z+ is given in radians
def cos(z)
if z.real?
cos!(z)
else
Complex(cos!(z.real) * cosh!(z.imag),
-sin!(z.real) * sinh!(z.imag))
end
end
##
# returns the tangent of +z+, where +z+ is given in radians
def tan(z)
if z.real?
tan!(z)
else
sin(z) / cos(z)
end
end
##
# returns the hyperbolic sine of +z+, where +z+ is given in radians
def sinh(z)
if z.real?
sinh!(z)
else
Complex(sinh!(z.real) * cos!(z.imag),
cosh!(z.real) * sin!(z.imag))
end
end
##
# returns the hyperbolic cosine of +z+, where +z+ is given in radians
def cosh(z)
if z.real?
cosh!(z)
else
Complex(cosh!(z.real) * cos!(z.imag),
sinh!(z.real) * sin!(z.imag))
end
end
##
# returns the hyperbolic tangent of +z+, where +z+ is given in radians
def tanh(z)
if z.real?
tanh!(z)
else
sinh(z) / cosh(z)
end
end
##
# returns the arc sine of +z+
def asin(z)
if z.real? and z >= -1 and z <= 1
asin!(z)
else
(-1.0).i * log(1.0.i * z + sqrt(1.0 - z * z))
end
end
##
# returns the arc cosine of +z+
def acos(z)
if z.real? and z >= -1 and z <= 1
acos!(z)
else
(-1.0).i * log(z + 1.0.i * sqrt(1.0 - z * z))
end
end
##
# returns the arc tangent of +z+
def atan(z)
if z.real?
atan!(z)
else
1.0.i * log((1.0.i + z) / (1.0.i - z)) / 2.0
end
end
##
# returns the arc tangent of +y+ divided by +x+ using the signs of +y+ and
# +x+ to determine the quadrant
def atan2(y,x)
if y.real? and x.real?
atan2!(y,x)
else
(-1.0).i * log((x + 1.0.i * y) / sqrt(x * x + y * y))
end
end
##
# returns the inverse hyperbolic sine of +z+
def asinh(z)
if z.real?
asinh!(z)
else
log(z + sqrt(1.0 + z * z))
end
end
##
# returns the inverse hyperbolic cosine of +z+
def acosh(z)
if z.real? and z >= 1
acosh!(z)
else
log(z + sqrt(z * z - 1.0))
end
end
##
# returns the inverse hyperbolic tangent of +z+
def atanh(z)
if z.real? and z >= -1 and z <= 1
atanh!(z)
else
log((1.0 + z) / (1.0 - z)) / 2.0
end
end
module_function :exp!
module_function :exp
module_function :log!
module_function :log
module_function :log2!
module_function :log2
module_function :log10!
module_function :log10
module_function :sqrt!
module_function :sqrt
module_function :cbrt!
module_function :cbrt
module_function :sin!
module_function :sin
module_function :cos!
module_function :cos
module_function :tan!
module_function :tan
module_function :sinh!
module_function :sinh
module_function :cosh!
module_function :cosh
module_function :tanh!
module_function :tanh
module_function :asin!
module_function :asin
module_function :acos!
module_function :acos
module_function :atan!
module_function :atan
module_function :atan2!
module_function :atan2
module_function :asinh!
module_function :asinh
module_function :acosh!
module_function :acosh
module_function :atanh!
module_function :atanh
module_function :frexp
module_function :ldexp
module_function :hypot
module_function :erf
module_function :erfc
module_function :gamma
module_function :lgamma
end
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