Re: 33s bug list (A START)
Message #2 Posted by Mike on 19 May 2004, 2:00 p.m.,
in response to message #1 by Dave Olson
Here is a pretty good start gleaned from this forum. (Sorry I did not cite the sources, all of whom are much smarter than I)
*****FRACTION ANONALY IN PROGRAM MODE
If you try to enter a fraction in PRGM mode it comes out with commas in the wrong place. Try this: enter program mode and enter the fraction 1234/567. It'll come out looking like this: 12,34/,567. If you enter the same fraction on RPN or ALG mode it works just fine. (My newer 33s does not do this, older model may)
****
STAYS IN RAD AFTER RESET
I realized today while doing my physics homework that my calculator was operating in radians mode, even though the RAD annunciator was not on. I did a bit of research, and realized that if you use the self-test (C and 1/x), the LCD screen reverts to its default state (only says RPN), but the calculator does not revert to the default state.
*****
SWAP FUNCTION DIFFERENT IN OLDER AND NEWER MODELS
In algebraic mode
Press:
24 divide 12 X<>Y ENTER and what do you get?
Does your HP33S show 0.5?
or
Do you get a divide by zero error?
The older (first run Calculators, SN CNA40…) result in 0.5, while the newer CNA41… result in divide by 0 error.
****
ALL CLEAR PRODUCES ODD DISPLAY
Switch to algebraic mode, and make sure the stack/display is clear by pressing the <C> (ON) key.
Press: 24 then press the Minus key.
Your display should have "24-" in the top line and "24.00" (assuming FIX 2) in the bottom line.
Now clear the calulator's memory by pressing the green <leftshift> key, followed by the <clx> key (you know, the <backspace> key just below TAN). Using the big "wobble" key, navigate to: 3ALL, and press <ENTER>. At the "CLR ALL? Y N" prompt, navigate to "Y" and press <ENTER>
Finally, press: 24 then press the ADD key. What do you see? On my calculator, the top line is "-24+" and the bottom line is "-24.00". What's up with that?!?
Here's another one in alg mode:
Press: 24 then press the Divide key.
Your display should have "24/" (/ is the divide symbol) in the top line and "24.00" (assuming FIX 2) in the bottom line.
Now clear the calulator's memory by pressing the green <leftshift> key, followed by the <clx> key (you know, the <backspace> key just below TAN). Using the big "wobble" key, navigate to: 3ALL, and press <ENTER>. At the "CLR ALL? Y N" prompt, navigate to "Y" and press <ENTER>
Finally, press: 24 then press the Divide key (or the Multiply or Minus or Plus key). What do you see? On the newer calculator, the top line is "0/" and the bottom line is "0.00". BTW, if you had pressed the any of the other keys (Multiply, Minus, or Plus), the top line would be "0x", "0-", or "0+", respectively, and the bottom line is "0.00").
****
COMPLEX NUMBER ANOMALY
Do a complex function in ALG Mode. Say, (3 +4 CMPLX) x (4 + 5 CMPLX). Now, you know that the real portion will show up in the display like "Re= -8" and you have to push the down arrow to see the imaginary part: " Im=31"
So this begs the question: how do you get to the imaginary part in a program? (since the down arrow is not a programmable function). You push x<>y! But look what happens when you do this manually: If you push x<>y, you then see "Re=31" and the top line will say "(31 -8i)" If you hit x<>y again, you get back to the "Re=-8"; the top line returns to "(-8 + 31i).
So, this x<>y is how you can use the results of complex number actions in a program. You STO to a variable, X<>Y, STO to another Variable and carry on from there. Note that only the value is stored in the variable---the "Re" part is stripped (this is consistent with the way the 32sii works, too, with say the results of an equation solve).
*****
PROBABILITY ERROR
2000 Enter 1000 nCr and the calculated result : 1.8099e499
The correct answer is: 2.048151626989490*10^600, which on an HP 33s would be an overflow.
Mike 1111
Edited: 19 May 2004, 3:21 p.m.
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