Memory Reallocation

[Thomas Klemm]

(12-08-2018 05:00 PM)Dieter Wrote:  So let's hear what the 15C users have to say.

Here's a program that allows to enter the elements of matrix A and calculates the determinant:

Code:

001-42,21,11    LBL A
002-      36    ENTER
003-42,23,11    DIM A
004-42,16, 1    MATRIX 1 ; 1 → R₀, 1 → R₁
005-42,21, 0    LBL 0
006-      31    R/S
007-u  44 11    STO A ; enter in USER mode
008-   22  0    GTO 0
009-45,16,11    RCL MATRIX A
010-42,16, 9    MATRIX 9 ; |A|
011-   43 32    RTN

Example:

\(\begin{vmatrix}
6 & 2 & -4 \\
5 & 6 & -2 \\
5 & 2 & -3
\end{vmatrix}=6\)

3 A
6 R/S
2 R/S
-4 R/S
5 R/S
6 R/S
-2 R/S
5 R/S
2 R/S
-3 R/S
6

It can also be used for matrices of dimensions other than \(3\times3\).
Don't forget to enter line 007 in USER mode!

Cheers
Thomas