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 downarrows 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 HP15C 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
