HP Forum Archive 21

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Matrix 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! Thanks!

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. d;-) 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 Thomas

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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