3x3 matrix operations for the HP-12C « Next Oldest | Next Newest »

 ▼ Kalevipoeg Junior Member Posts: 28 Threads: 10 Joined: Jun 2007 02-06-2005, 07:18 AM There has been a lot of messages concerning trig. functions for the HP-12C. Here is a new math theme for the HP-12C fans: 3x3 MATRIX OPERATIONS FOR THE HP-12C I wrote this program some times ago. I just wanted to see if it is possible to program any 3x3 matrix operations for the HP-12C. And it was possible... This program uses Cramer's rule to solve systems of linear equations with 3 unknowns. In matrix form AX=B. PROGRAM LISTING ```01 0 02 STO 0 03 RCL 5 04 RCL 9 05 * 06 RCL 6 07 RCL 8 08 * 09 - 10 RCL 1 11 * 12 RCL 4 13 RCL 9 14 * 15 RCL 6 16 RCL 7 17 * 18 - 19 RCL 2 20 * 21 - 22 RCL 4 23 RCL 8 24 * 25 RCL 5 26 RCL 7 27 * 28 - 29 RCL 3 30 * 31 + 32 RCL 0 33 X=0? 34 GTO 41 35 / 36 R/S 37 1 38 CHS 39 STO*0 40 GTO 44 41 RDN 42 STO 0 43 / 44 RCL 1 45 RCL 2 46 RCL 3 47 RCL n 48 STO 3 49 RDN 50 STO 2 51 RDN 52 STO 1 53 RDN 54 STO n 55 RCL 4 56 RCL 5 57 RCL 6 58 RCL i 59 STO 6 60 RDN 61 STO 5 62 RDN 63 STO 4 64 RDN 65 STO i 66 RCL 7 67 RCL 8 68 RCL 9 69 RCL PV 70 STO 9 71 RDN 72 STO 8 73 RDN 74 STO 7 75 RDN 76 STO PV 77 GTO 03 ``` USER INSTRUCTIONS 1) Key in the program 2) Store elements of matrix A into registers R1 through R9 3) Store elements of matrix B into registers n, i and PV 4) Press [f] [PRGM] [R/S] to calculate x1 5) Press [R/S] to calculate x2 6) Press [R/S] to calculate x3 7) Press [R/S] once again to return elements of matrices A and B into their original registers (-1.00 will be displayed) 8) For a new case, go to step 2 or 3. Rem: If Det A=0, then the system is linearly dependent and this program is not applicable (Error 0 will be displayed) Ref: For example HP-34C Mathematics Applications Book ▼ Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 02-06-2005, 08:42 AM Cool! Do you store the matix A by rows or by columns in registers 1 through 9? Namir ▼ Kalevipoeg Junior Member Posts: 28 Threads: 10 Joined: Jun 2007 02-06-2005, 09:09 AM Store elements of matrix A by rows: a11 into R1 a12 into R2 a13 into R3 a21 into R4 etc. Have a nice calculating day! Kalevipoeg ▼ Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 02-06-2005, 11:07 AM Thanks!!! GWB Member Posts: 88 Threads: 10 Joined: Jan 1970 02-06-2005, 01:38 PM Very nice! What will come next? Numerical integration? I wonder why HP did not include more scientific functions in the new Platinum model. Are they affraid that would scare potential buyers? If so, they are underestimating business people. Or have they just lost the know-how?. Don't you think it is time to realese a 15C Platinum, or at least a 15C Tin? Oops, I'm getting off-topic. Sorry. Regards, Gerson Mike T. Senior Member Posts: 282 Threads: 46 Joined: Jul 2005 02-11-2005, 03:44 PM I just know I'm missing something here - but I'm I know that the HP11C doesn't have STO PV or RCL PV so I was wondering what the HP11C equivalents are in this case ? Thanks ▼ GWB Member Posts: 88 Threads: 10 Joined: Jan 1970 02-11-2005, 08:33 PM Hi, n, i, PV, PMT and FV are special financial register of the 12C. You can use the remanaing registers instead. The author has used some of those because he ran out of ordinary registers as his program grew, I think. Regards, Gerson.

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