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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. *

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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