From: Bilge on
Ka-In Yen, crackpot of the day:

>Phineas T Puddleduck wrote:
[...]
>> What does the direction in a mass vector represent?
>
>In 3D vector algebra, we have to divide a mass by a length vector; so
>the linear mass density is a vector, and its direction is same to the
>length vector.

You need a remedial course in vector algebra. Length is a scalar.
The length of a vector, V is defined by L = sqrt(V.V). A linear
mass density is a scalar.


From: Ka-In Yen on

Phineas T Puddleduck wrote:
> In article <1151713860.481999.282010(a)p79g2000cwp.googlegroups.com>,
> Ka-In Yen <yenkain(a)yahoo.com.tw> wrote:
>
> > Eric Gisse wrote:
> > > Ka-In Yen wrote:
> > >
> > > [...]
> > >
> > > >
> > > > For your reference: vector division in Matlab.
> > > >
> > > > http://newsreader.mathworks.com/WebX?14(a)88.ug0LaenUYOM.0@.ef097af
> > >
> > > Worthless. Using the method MATLAB uses, there are an infinite number
> > > of matricies that a and b that create the product a/b.
> >
> > Obviously you did not read Titus's posting carefully. Please try again:
> >
> > http://www.google.com/search?hl=en&lr=&q=%22vector+division+in+matlab%22
> >
> >
> >
> > > You repost the same tripe about once a month in the same thread over
> > > and over while ignoring criticisms that would cause you to have to
> > > abandon your work.
> >
> > Home work for Eric Gisse:
> > A rectangle sits in 3D space. The area vector of the rectangle is A,
> > and the legth vector of one side of the rectangle is L. Please find
> > the length vector of the other side of the rectangle?
> >
>
> Are you truly this clueless?

The answer is in this thread.

From: Ka-In Yen on

Eric Gisse wrote:
> Ka-In Yen wrote:
> > Eric Gisse wrote:
> > > Ka-In Yen wrote:
> > >
> > > [...]
> > >
> > > >
> > > > For your reference: vector division in Matlab.
> > > >
> > > > http://newsreader.mathworks.com/WebX?14(a)88.ug0LaenUYOM.0@.ef097af
> > >
> > > Worthless. Using the method MATLAB uses, there are an infinite number
> > > of matricies that a and b that create the product a/b.
> >
> > Obviously you did not read Titus's posting carefully. Please try again:
> >
> > http://www.google.com/search?hl=en&lr=&q=%22vector+division+in+matlab%22
>
> What part of "underdetermined" confuses you?
>
> Vector division is not defined at all, much less that way, because
> there is no unique inverse!
>
> >
> >
> >
> > > You repost the same tripe about once a month in the same thread over
> > > and over while ignoring criticisms that would cause you to have to
> > > abandon your work.
> >
> > Home work for Eric Gisse:
> > A rectangle sits in 3D space. The area vector of the rectangle is A,
> > and the legth vector of one side of the rectangle is L. Please find
> > the length vector of the other side of the rectangle?
>
> LENGTH IS NOT A VECTOR.

Length-vector is a vector.

>
> AREA IS NOT A VECTOR.

For your reference:

http://en.wikipedia.org/wiki/Vector_area

From: Eric Gisse on

Ka-In Yen wrote:
> Phineas T Puddleduck wrote:
> > In article <1151713860.481999.282010(a)p79g2000cwp.googlegroups.com>,
> > Ka-In Yen <yenkain(a)yahoo.com.tw> wrote:
> >
> > > Eric Gisse wrote:
> > > > Ka-In Yen wrote:
> > > >
> > > > [...]
> > > >
> > > > >
> > > > > For your reference: vector division in Matlab.
> > > > >
> > > > > http://newsreader.mathworks.com/WebX?14(a)88.ug0LaenUYOM.0@.ef097af
> > > >
> > > > Worthless. Using the method MATLAB uses, there are an infinite number
> > > > of matricies that a and b that create the product a/b.
> > >
> > > Obviously you did not read Titus's posting carefully. Please try again:
> > >
> > > http://www.google.com/search?hl=en&lr=&q=%22vector+division+in+matlab%22
> > >
> > >
> > >
> > > > You repost the same tripe about once a month in the same thread over
> > > > and over while ignoring criticisms that would cause you to have to
> > > > abandon your work.
> > >
> > > Home work for Eric Gisse:
> > > A rectangle sits in 3D space. The area vector of the rectangle is A,
> > > and the legth vector of one side of the rectangle is L. Please find
> > > the length vector of the other side of the rectangle?
> > >
> >
> > Are you truly this clueless?
>
> The answer is in this thread.

I suppose that is true...

From: Eric Gisse on

Ka-In Yen wrote:

[...]

>
> A^(-1) = 1/A = A/A^2

VECTOR DIVISION IS *NOT* A DEFINED OPERATION!

[...]

>
> Area vector is chinilish(chinese-english). It's my bad, my
> english is not so well. Area vector(chinilish) is same to
> vector area(english).

It is neither the fault of Chinese (which Chinese? There is a bunch)
nor English that you do not know what you are talking about.

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