Thread overview
opDiv & ifloat
May 11, 2005
Thomas Kuehne
May 11, 2005
Walter
May 11, 2005
Thomas Kuehne
May 11, 2005
Uwe Salomon
May 11, 2005
Thomas Kuehne
May 11, 2005
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#
# idouble f = 4.0i / 2.0i;
#
dmd: cannot implicitly convert expression (4i / 2i) of type float to ifloat

Added to DStress as http://dstress.kuehne.cn/run/o/opDiv_10_A.d http://dstress.kuehne.cn/run/o/opDiv_10_B.d http://dstress.kuehne.cn/run/o/opDiv_10_C.d http://dstress.kuehne.cn/run/o/opDiv_10_D.d http://dstress.kuehne.cn/run/o/opDiv_10_E.d http://dstress.kuehne.cn/run/o/opDiv_10_F.d

Thomas


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May 11, 2005
"Thomas Kuehne" <thomas-dloop@kuehne.thisisspam.cn> wrote in message news:rit129-at3.ln1@lnews.kuehne.cn...
>
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> #
> # idouble f = 4.0i / 2.0i;
> #
> dmd: cannot implicitly convert expression (4i / 2i) of type float to
ifloat

Which is correct. An imaginary divided by an imaginary is a real number.


May 11, 2005
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Walter schrieb am Wed, 11 May 2005 10:26:57 -0700:
>
> "Thomas Kuehne" <thomas-dloop@kuehne.thisisspam.cn> wrote in message news:rit129-at3.ln1@lnews.kuehne.cn...
>>
>> #
>> # idouble f = 4.0i / 2.0i;
>> #
>> dmd: cannot implicitly convert expression (4i / 2i) of type float to
> ifloat
>
> Which is correct. An imaginary divided by an imaginary is a real number.
>

Interresting: The documentations I used (one math, the other computing) disagree with eachother. I'll take a closer look at this tomorrow.

Note: I'm not talking about

# cfloat a = 0.0 + 4.0i;
# cfloat b = 0.0 + 2.0i;
# cfloat c = a / b;

but about

# ifloat a = 4.0i;
# ifloat b = 2.0i;
# ifloat c = a / b;

Thomas


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May 11, 2005
>>> #
>>> # idouble f = 4.0i / 2.0i;
>>> #
>>> dmd: cannot implicitly convert expression (4i / 2i) of type float to
>> ifloat
>>
>> Which is correct. An imaginary divided by an imaginary is a real number.
>>
>
> Interresting: The documentations I used (one math, the other computing)
> disagree with eachother.

Well, then the one which says that it is ok is wrong. Walter is 100% right about the underlying maths here. Note that 4.0i * 2.0i is also a real value: -8.0.

Ciao
uwe
May 11, 2005
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Uwe Salomon schrieb am Wed, 11 May 2005 22:12:38 +0200:
>>>> #
>>>> # idouble f = 4.0i / 2.0i;
>>>> #
>>>> dmd: cannot implicitly convert expression (4i / 2i) of type float to
>>> ifloat
>>>
>>> Which is correct. An imaginary divided by an imaginary is a real number.
>>>
>>
>> Interresting: The documentations I used (one math, the other computing)
>> disagree with eachother.
>
> Well, then the one which says that it is ok is wrong. Walter is 100% right about the underlying maths here. Note that 4.0i * 2.0i is also a real value: -8.0.

The computing docu used the "unusuall" approach of independent root dimensions:

real (dim A)
imaginary (dim B)
complex (dim A+B)

The math docu used the normal approach:

real (dim A)
complex (dim A+B)
imaginary (dim A+B where the values in A=0)

Moved the test cases to nocompile.

Thomas


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