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HP Forum Archive 21

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Message #1 Posted by Richard Berler on 18 Aug 2013, 12:42 p.m.

How do I enter matrices, dimension them, designate a result matrix? I can do this on the 15C, but it's not obvious to me how to accomplish this on the 34s!


Re: Matrix
Message #2 Posted by Walter B on 18 Aug 2013, 1:13 p.m.,
in response to message #1 by Richard Berler

Please see pp. 35f of TFM. Continue reading (as indicated) on p. 144 and p. 101 for LINEQS.


Edited: 18 Aug 2013, 1:16 p.m.

Re: Matrix
Message #3 Posted by Thomas Klemm on 18 Aug 2013, 6:17 p.m.,
in response to message #1 by Richard Berler

Without reading the aforementioned manual: a matrix descriptor consistst of three numbers: the register i where to start storing the elements, the number of rows r and the number of columns c. These three numbers are merged into one using the format i.rrcc. So for instance 5.0203 is a matrix descriptor for a 2x3 matrix whose elements are stored in register 05 and the following. This is similar to the numbers we use for ISG and DSE.

The simplest way to enter a matrix is using the program MED. Use up- and down-arrows to navigate through the elements. But you can just as well store the numbers in the correct registers.

Say you want to find the inverse of [[1 2][3 4]]:

1 STO 00
2 STO 01
3 STO 02
4 STO 03
0.0202 M-1
RCL 00 -> -2
RCL 01 -> 1
RCL 02 -> 1.5
RCL 03 -> -0.5
Compared to the HP-15C you have to make sure the matrix descriptors don't specify overlapping regions. But you are not restricted to use just five matrix descriptors.

Kind regards

Re: Matrix
Message #4 Posted by Paul Dale on 18 Aug 2013, 6:24 p.m.,
in response to message #3 by Thomas Klemm

If the column count is missing, the matrix defaults to square. Thus the descriptor here could be just 0.02.

- Pauli

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