HP-15C Bug with MATRIX 5 Message #1 Posted by Thomas Klemm on 3 Feb 2012, 11:39 a.m.
So I was trying to use ATB to calculate the scalar product of a vector with itself:
Definition of a 4x1 vector E
Set USER mode to enter the coordinates of the vector E = [1 2 3 4]T:
4
ENTER
1
DIM E
MATRIX 1
1 STO E
2 STO E
3 STO E
4 STO E
Calculate ETE
We'd expect that to be: 12 + 22 + 32 + 42 = 30.
RCL MATRIX E
RESULT A
ENTER
MATRIX 5
MATRIX 1
RCL A
And we get indeed:
30.0000
Running as a program
Use CLEAR PRGM to have all the programs removed. WARNING: you may not want to do that!
Now enter the few steps from above:
001-42,26,11 RESULT A
002- 36 ENTER
003-42,16, 5 MATRIX 5
004-42,16, 1 MATRIX 1
005-u 45 11 RCL A
And run the program:
RCL MATRIX E
RTN
R/S
I get an ERROR 11: Improper Matrix Argument. For MATRIX 5 the Appendix A: Error Conditions states as possible reasons:
- the input is a scalar;
- the dimensions are incompatible; or
- the result is one of the arguments.
The funny thing is that the result is there. The stack consists of the following values:
T:
Z: A 1 1
Y: 30.0000
X: 30.0000
But the program stopped at this line:
003-42,16, 5 MATRIX 5
Workaround
A simple workaround is to add a RTN statement at the end of the program. Or you can single-step through the program as well.
Now is this a well known bug of the HP-15C? Could somebody verify this on a real calculator and possibly on the HP-15C LE? Unfortunately I can only test this with an emulator.
Kind regards
Thomas
PS: You think I should use MATRIX 8 followed by x2 instead?
Edited: 3 Feb 2012, 11:44 a.m.
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