Is there any reason why the text form of ::std:: complex is (u,v) and not
(u+v*i)?  The text form of fundamental types is human-readable and
intuitive, except for complex numbers.

Chris


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Am 25.09.2011 06:47, schrieb Krzysztof   elechowski:
>  Is there any reason why the text form of ::std:: complex is (u,v) and not
>  (u+v*i)?
>  The text form of fundamental types is human-readable and
>  intuitive, except for complex numbers.

Well, the criteria for intuition are not the only once that determine
such a decision, efficiency and simplicity have similar weights. Given
your alternative example, I would argue that "u+v*i" is even more
natural and I would expect that "v*i" just works as well. But given the
fact that C++ does not have direct support for imaginary numbers, the
current format decision is IMO a logical conclusion.

HTH&  Greetings from Bremen,

Daniel Kr  gler





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Daniel Kr  gler wrote:

>  Am 25.09.2011 06:47, schrieb Krzysztof   elechowski:
>>   Is there any reason why the text form of ::std:: complex is (u,v) and
>>   not (u+v*i)?
>>   The text form of fundamental types is human-readable and
>>   intuitive, except for complex numbers.
>
>  Well, the criteria for intuition are not the only once that determine
>  such a decision, efficiency and simplicity have similar weights. Given
>  your alternative example, I would argue that "u+v*i" is even more
>  natural and I would expect that "v*i" just works as well.

I would expect that (v*i) be well-formed input for complex and I consider it
possible for the library to implement.

>  But given the
>  fact that C++ does not have direct support for imaginary numbers, the
>  current format decision is IMO a logical conclusion.

I am sorry, I do not understand.  C++ has native support for integer numbers
but the decision how to format them as text is on the library.  So is the
decision how to format complex numbers.  I can see no difference.

Note that the format (u+v*i) would not require the showpoint option, which
is currently required for my locale and it looks very hackish.

Thanks,
Chris


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On Sep 25, 5:47 am, Krzysztof    elechowski<giecr...@stegny.2a.pl>
wrote:
>  Is there any reason why the text form of ::std:: complex is (u,v) and not
>  (u+v*i)?  The text form of fundamental types is human-readable and
>  intuitive, except for complex numbers.

  Why the *? i before after the v? i or j? Manipulators to control
these?


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