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From: "ldries46" <bertus.dries@planet.nl>
Newsgroups: comp.lang.ada
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Subject: Re: Incorrect error?
Date: Mon, 18 Jul 2011 13:46:18 +0200
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Date: 2011-07-18T13:46:18+02:00
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I just was converting a C++ program with the function VecCross The 
suggestion in that program was that a Cross vector was the result of a 
vector product.

L. Dries


"Georg Bauhaus"  schreef in bericht 
news:4e240690$0$6538$9b4e6d93@newsspool4.arcor-online.net...

On 18.07.11 11:45, stefan-lucks@see-the.signature wrote:
> On Mon, 18 Jul 2011, ldries46 wrote:
>
> [...]
>>   a      : Real_Vector(0 .. 2);
>>   b      : Real_Vector(0 .. 2);
>>   cross  : Real_Vector(0 .. 2);
>> begin
> [...]
>>     Cross := a * b; -- VecCross( a, b, Cross ); <---------------- line 65 
>> the
>
> Why do you expect the product of two vectors to be an vector?

For a vector product, if a ⨯ b is to be one, I find the expectation
quite justified.  Confusion is what we get in return for Ada overloading
ASCII punctuation, in this case "*".  ;-)  (Wolfram's title is
"cross product", http://mathworld.wolfram.com/CrossProduct.html
IIUC.)