+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: General Forum (/forum-4.html)
+--- Thread: HP-50G CON function behavior (/thread-15635.html)
HP-50G CON function behavior - Artur - Brasil - 09-24-2020 06:47 PM
Hi, guys!
I'm trying a program in my 50G using State Space for representing systems, when we need to create a matrix A of dimension nxn of constant value 0 (zero).
Simple, isn't it? For example: A3x3 of 1s:
[3 3] 1 CON (in MATRICES/CREATE menu)
The HP-50G returns the asked matrix.
But I need to replace some elements starting at 2nd for one 2x2 identity matrix. So:
2 ENTER
2 IDN - this returns the Identity matrix
Try to use the REPL command and BOW! Not working!
See the type of matrix A: 29 - algebric!
Why???
I discovered tha I had to use -->num for it works... but it is not the ideal world...
By the way: I turned ON the flag 85 and my programms'listing on stack was crazy! But editing them, the code behind was ok!
Best regards,
Artur _brazil
Artur
RE: HP-50G CON function behavior - John Keith - 09-25-2020 01:21 PM
The command AXM will convert an algebraic matrix to a numeric matrix or vice versa.
Are you using exact or approximate numbers in your matrices?
Edit: I tried your actions on my HP 50 in approximate mode. Note that for CON the dimensions need to be in curly braces { } not brackets. This is the matrix I got:
Code:
[[ 1. 1. 0. ]
[ 1. 0. 1. ]
[ 1. 1. 1. ]]The matrix is type 3 (numeric).