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 ▼ Lisa Junior Member Posts: 2 Threads: 2 Joined: Jan 1970 10-08-2000, 07:35 PM I need help using the matrix function of my hp 15c. Any instruction would be much appreciated. ▼ William L. Drylie Member Posts: 52 Threads: 12 Joined: Jul 2007 10-09-2000, 10:07 PM Lisa. The section in the manual for Calculating With Matrices is about 41 pages. If you e-mail your address to me, I would send you a reprint. For now, I will get you started with an example from the manual. The 15c can work with up to 5 matrices which are named A through E using the 15's corresponding A through E keys. You can specify the size of each matrix, store and recall values of matrix elements and perform matrix operations with complex and real elements. Consider the example. 3.8x1 + 7.2x2 = 16.5 1.3x1 - 0.9x2 = -22.1 determine the values of x1 and x2. Keystrokes: g CF 8 deactivates complex mode. 2 Enter f DIM A dimensions matrix A to be 2X2 f Matrix 1 prepares for automatic entry of matrix elements in user mode. f USER turns on user annunciator 3.8 STO A Denotes Matrix A row 1 column 1 7.2 STO A 1.3 STO A .9 CHS STO A 2 ENTER 1 f DIM B Dimensions matrix B to be 2X1 16.5 STO B 22.1 CHS STO B f RESULT C designates matrix C storing the result. RCL MATRIX B RCL MATRIX A / press divide key RCL C displays 1, 1 (row 1, column 1) -11.2887 (value of (X1)) RCL C 8.2496 (value of (X2)) f USER deactivates user mode f MATRIX 0 Clears all matrices. The solution to the system is X1 = -11.2887 ans X2 = 8.2496. Up to 64 matrix elements can be stored in memory. Use all 64 in one matrix or distribute them among up to 5 matrices. Matrix inversion can be performed on an 8X8 with real elements or a 4X4 with complex elements. If you have need of further help, I suggest you e-mail me directly at wldrylie@702com.net. I will help more. Or e-mail mailing address, I will send you 15C reprint of matrix section of manual. Good luck. I still have fun using my 15C at work. I can also provide many an engineering example from my daily work and programs. Let me know. Bill. Tom Liang Junior Member Posts: 1 Threads: 0 Joined: Jan 1970 10-16-2000, 05:12 PM I have an out-of-production HP15C, but I have misplaced the basic user's manual, although I have the advanced manual. There is an annoying "c" indicator on the lower level of the window and slightly more than three-quaters to the right. I have a guess as to think that it indicates "complex" mode. But when I when I hit the "Re>

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