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May 11, 2005 opDiv & ifloat | ||||
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 # # 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 -----BEGIN PGP SIGNATURE----- iD8DBQFCglyc3w+/yD4P9tIRAjj+AJ4+uZoiMXovPi9A35k3YHH+lZyufwCeL2fs TP0QVz5xutS0ChsGReWPU60= =XAKG -----END PGP SIGNATURE----- |
May 11, 2005 Re: opDiv & ifloat | ||||
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Posted in reply to Thomas Kuehne | "Thomas Kuehne" <thomas-dloop@kuehne.thisisspam.cn> wrote in message news:rit129-at3.ln1@lnews.kuehne.cn... > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > # > # 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 Re: opDiv & ifloat | ||||
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Posted in reply to Walter | -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 -----BEGIN PGP SIGNATURE----- iD8DBQFCgnHy3w+/yD4P9tIRAmShAJ9CzULIqlvulubMsD5GERIiYE3OegCfS6K1 K/PTQ3fWptIq/jWawRbI7jM= =xscW -----END PGP SIGNATURE----- |
May 11, 2005 Re: opDiv & ifloat | ||||
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Posted in reply to Thomas Kuehne | >>> #
>>> # 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
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May 11, 2005 Re: opDiv & ifloat | ||||
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Posted in reply to Uwe Salomon | -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 -----BEGIN PGP SIGNATURE----- iD8DBQFCgrYS3w+/yD4P9tIRAv1wAKCy+ZPHe3/42E9pxl42j4MzRxKNKACeLQVS EtjFU+eVhlKyrWRQOd0aSRc= =+tfd -----END PGP SIGNATURE----- |
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