Matrix

[Richard Berler]

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!

Thanks!

[Walter B]

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

d;-)

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

[Thomas Klemm]

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

Thomas

[Paul Dale]

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

- Pauli