[TIB] Re: Matrix on the 92 plus

[Prev][Next][Index][Thread]

[TIB] Re: Matrix on the 92 plus


Hi,
Thanks for helping with these matrices.
I have three questions to answer, I would like to know how to work these out
on the TI89.
These questions are from a revision sheet I am working on.
I can do question 1 and 2 ok but question 3 I am not entirely sure I am
working it out right so it would be handy if I knew how to work this out on
the calculator to check my results.

Ok firstly I have three matrices.

A= [[1,2,3][3,0,2]] 3x2 matrix
B=[[4,1,3][0,2,1]] 3x2 matrix
C=[[1,2][3,1][2,3]] 2x3 matrix

These are the questions:-

Q1. Which of the following make sense: AB, AC, BC, AB^T, AC^T, and BC^T ?

Q2. Evaluate those products that do exist.

Q3. Evaluate (A^T B)C and (A^T) BC and show that they are equal. ( I can
work out whats inside the brackets and add them together but I am not sure
what to do with what is outside the brackets. )

It is easy to build the matrices on the TI89, however I have no idea how to
work out the questions.

Hope you can help.

Thanks

Nick




----- Original Message -----
From: "Nick Peaden" <Nitrocloud@earthlink.net>
To: <ti-basic@lists.ticalc.org>
Sent: Wednesday, November 27, 2002 3:53 AM
Subject: [TIB] Re: Matrix on the 92 plus


>
> No I wouldn't mind helping you at all... Just drop me e-mail on what you
> need.
>
> ----- Original Message -----
> From: "Nick E. Messenger" <robocom@madasafish.com>
> To: <ti-basic@lists.ticalc.org>
> Sent: Tuesday, November 26, 2002 8:32 AM
> Subject: [TIB] Re: Matrix on the 92 plus
>
>
> >
> > Hi,
> > I bought the TI89 too and I am having difficulties using Matrices.
> > Would you mind helping me figure out how to work out matrices on the
TI89.
> >
> > Nick
> >
> > ----- Original Message -----
> > From: <Nitrocloud@aol.com>
> > To: <ti-basic@lists.ticalc.org>
> > Sent: Tuesday, November 05, 2002 12:06 PM
> > Subject: [TIB] Re: Matrix on the 92 plus
> >
> >
> > >
> > > Ok.  I have an 89 and lately I just completed a little part of matrix
> > algebra in Algebra II.  I'm surprized that I didn't speak earlier, but
> here
> > it is.
> > >
> > > [[1,2][3,4]]->a //Stores the matrix
> > > a[1] //Returns row 1 = [1,2]
> > > a[1,2] //Returns element 2 of row 1 = [2]
> > > 5->a[1,1] //Changes 1 to 5
> > > a //displays the matrix = [[5,2][3,4]]
> > > In a message dated Tue, 5 Nov 2002 11:23:33 +0100 (MET),
> > robvanwijk@gmx.net writes:
> > >
> > > >
> > > >
> > > > > Hi all,
> > > > > Ok I figured out from the manual how to make a matrix on the 92
plus
> > > > >
> > > > > [[1,2,3][4,5,6]]->mat1 This makes the matrix with 1,2,3 as row 1
and
> > > > > 4,5,6 as row 2. the thing I cant get to work is how to edit them.
> Like
> > > > > for a list you do list[2] and that gives you the 2nd var in the
> list.
> > > > > But with a matrix.aint gotta clue lol. Please someone fill me in
on
> > this
> > > > > thnx.
> > > > >
> > > >
> > > > On the 83 it works like this: (A is the matrix)
> > > > A{1,2} gives the second element of the first row.
> > > > SomeNumber->A{1,2} stores the number to the second element
> > > > of the first row, without effecting the rest of the matrix.
> > > >
> > > > I don't have a 92, but I'd guess you'd have to use either what I
> > > > said, or replace the braces ( '{', '}' ) with brackets ( '[', ']' ).
> > > > Otherwise, why don't you read the manual again, it should
> > > > be in
> > > > there.....
> > > >
> > > > Grtz,
> > > > Rob van Wijk
> > >
> > >
> >
> >
>
>
>
Follow-Ups: References: