HP-50G CON function behavior

[Artur - Brasil]

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

[John Keith]

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).