Mathematically speaking, a 'vector' is something you can add to another
vector and multiply by a number. But in C++, the following code is
illegal:
std::vector<dou ble> v1(3), v2(3);
v1 + v2; // Illegal
v1 * 2.; // Illegal
In addition, vectors of different dimensions belong two different spaces
(types). But in C++, the following code is legal:
std::vector<dou ble> v1(2), v2(3);
v1 = v2; // Legal
Why they were so dumb to call it 'vector', instead of, say, 'sequence'?
--
Carlo Milanesi http://digilander.libero.it/carlmila 19  3276 
"Carlo Milanesi" <ca************ ********@libero .it> wrote in message
news:2003111323 3531.2c53c12a.c a************** ******@libero.i t... Mathematically speaking, a 'vector' is something you can add to another
vector and multiply by a number. But in C++, the following code is
illegal:
std::vector<dou ble> v1(3), v2(3);
v1 + v2; // Illegal
v1 * 2.; // Illegal
That's because C++ is a programming language, not mathematics.
In addition, vectors of different dimensions belong two different spaces
(types). But in C++, the following code is legal:
std::vector<dou ble> v1(2), v2(3);
v1 = v2; // Legal
That says v1 = v2, not v1 == v2.
Why they were so dumb to call it 'vector', instead of, say, 'sequence'?
Because they didn't have to adhere to predetermined meanings of words. What
do you think "program" meant before computers were invented? See http://wombat.doc.ic.ac.uk/foldoc/fo...&action=Search
Hi Carlo Milanesi,
"Carlo Milanesi" <ca************ ********@libero .it> schrieb im Newsbeitrag
news:2003111323 3531.2c53c12a.c a************** ******@libero.i t... Mathematically speaking, a 'vector' is something you can add to another
vector and multiply by a number. But in C++,
The term is of historical origins. Since the BCPL programming language (the
ancestor of C), arrays have been called "vectors". :-)
(perhaps b/c that's what they've been used for by the BCPL language inventor
Martin Richards, or other people in the 1960ies or earlier even)
I hope this helps.
Regards,
Ekkehard Morgenstern.
Carlo Milanesi wrote: Mathematically speaking, a 'vector' is something
that you can add to another vector and multiply by a number.
But in C++, the following code is illegal:
std::vector<dou ble> v1(3), v2(3);
v1 + v2; // Illegal
v1*2.0; // Illegal
In addition, vectors of different dimensions belong two different spaces
(types). But in C++, the following code is legal:
std::vector<dou ble> v1(2), v2(3);
v1 = v2; // Legal
Why they were so dumb to call it 'vector', instead of, say, 'sequence'?
According to Bjarne Stroustrup,
"The C++ Programming Language: Third Edition", Chapter 22: Numerics,
Section 4: Vector Arithmetic, page 662:
"One could argue that /valarray/ should have been called /vector/
because it is a traditional mathematical vector
and that /vector/ should have been called /array/."
Evidently, Bjarne agrees with you.
The standard vector class is actually a flexible [dynamic] array class.
It probably isn't the best choice for vector arithmetic.
If you want to use a standard C++ class template, use valarray.
E. Robert Tisdale wrote: According to Bjarne Stroustrup,
"The C++ Programming Language: Third Edition", Chapter 22: Numerics,
Section 4: Vector Arithmetic, page 662:
"One could argue that /valarray/ should have been called /vector/
because it is a traditional mathematical vector
and that /vector/ should have been called /array/."
Evidently, Bjarne agrees with you.
Well, he only said that "One could argue", not that he does :-)
Carlo Milanesi wrote: Why they were so dumb to call it 'vector', instead of, say,
'sequence'?
'sequence' already has another meaning in C++.
"Carlo Milanesi" <ca************ ********@libero .it> wrote in message
news:2003111323 3531.2c53c12a.c a************** ******@libero.i t... Mathematically speaking, a 'vector' is something you can add to another
vector and multiply by a number. But in C++, the following code is
illegal:
std::vector<dou ble> v1(3), v2(3);
v1 + v2; // Illegal
v1 * 2.; // Illegal
In addition, vectors of different dimensions belong two different spaces
(types). But in C++, the following code is legal:
std::vector<dou ble> v1(2), v2(3);
v1 = v2; // Legal
Why they were so dumb to call it 'vector', instead of, say, 'sequence'?
--
Carlo Milanesi
http://digilander.libero.it/carlmila
You could say that about a lot terms, such as functor. Different fields use
the same terms for different things. Just ask a chemist and an astrologer
(astrophysicist ?) what "metal" means. You will get to different answers.
Deal with it.
"Xenos" <do**********@s pamhate.com> wrote in message
news:bp******** *@cui1.lmms.lmc o.com... You could say that about a lot terms, such as functor. Different fields
use the same terms for different things. Just ask a chemist and an astrologer
(astrophysicist ?) what "metal" means.
It's a style of rock music. :-)
-Mike
Mike Wahler wrote:
"Xenos" <do**********@s pamhate.com> wrote in message
news:bp******** *@cui1.lmms.lmc o.com...
You could say that about a lot terms, such as functor. Different
fields
use the same terms for different things. Just ask a chemist and an
astrologer (astrophysicist ?) what "metal" means.
It's a style of rock music. :-)
Would the chemist say that or the astrologer? :-)
Xenos wrote: Carlo Milanesi wrote:
Mathematicall y speaking, a 'vector' is something you can add to another
vector and multiply by a number. But in C++, the following code is
illegal:
std::vector<d ouble> v1(3), v2(3);
v1 + v2; // Illegal
v1 * 2.; // Illegal
In addition, vectors of different dimensions belong two different spaces
(types). But in C++, the following code is legal:
std::vector<d ouble> v1(2), v2(3);
v1 = v2; // Legal
Why they were so dumb to call it 'vector', instead of, say, 'sequence'?
--
Carlo Milanesi
http://digilander.libero.it/carlmila
You could say that about a lot terms, such as functor.
Different fields use the same terms for different things.
No. It *is* a misnomer.
It doesn't fit in with the jargon of *any* discipline.
Deal with it. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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