Martin Rubey wrote:
>
> I forgot:
>
> gcl:
>
> (1) -> log(-2::Complex DFLOAT)
>
> (2) 0.69314718055994529 + 3.1415926535897931 %i
> Type: Complex(DoubleFloat)
> (2) -> log(complex(-2::DFLOAT, -0))
>
> (2) 0.69314718055994529 + 3.1415926535897931 %i
> Type: Complex(DoubleFloat)
> Type: Complex(DoubleFloat)
> (2) -> log(-2::Complex DFLOAT)
> 1>exit Complex.real,13 :
> 2.0
> 1<enter Complex.imag,15 :
> arg1= 2.0
> 1>exit Complex.imag,15 :
> 0.0
> 1<enter Complex.complex,37 :
> arg1= - 2.0
> arg2= -0.0
> 1>exit Complex.complex,37 :
> - 2.0
> 1<enter S-TO-C : (-2.0 . -0.0)
> 1>exit S-TO-C : #C(-2.0 -0.0)
>
> 1<enter Complex.real,13 :
> arg1= 0.6931471805599453 - 3.141592653589793 %i
> 1>exit Complex.real,13 :
> 0.6931471805599453
> 1<enter Complex.imag,15 :
> arg1= 0.6931471805599453 - 3.141592653589793 %i
> 1>exit Complex.imag,15 :
> - 3.141592653589793
> (2) 0.6931471805599453 - 3.141592653589793 %i
> Type: Complex(DoubleFloat)
>
> I wonder where the -0.0 comes from...
>
(3) -> parse("log(-2::Complex DFLOAT)")$INFORM
(3) (log (- (:: 2 (Complex DFLOAT))))
Type: InputForm
so, 2 is first converted to complex and then the result is negated.
--
Waldek Hebisch
[EMAIL PROTECTED]
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