A curious output from the HP-35s Palmer O. Hanson, Jr. Posting Freak Posts: 901 Threads: 113 Joined: Jun 2007 12-07-2008, 09:08 PM In Algebraic and Fix 1 mode enter the following complex arithmetic problem: (6 + 3i) - (4 + 6i) Press ENTER and see 2.0+-3.0i in the display. Bizarre! Chuck Senior Member Posts: 320 Threads: 59 Joined: Dec 2006 12-07-2008, 09:32 PM I see 2.0i-3.0. No stranger than entering 2+-3i and hitting enter. It looks strange, but the i just separates the real and imaginary parts. Edited: 8 Dec 2008, 8:51 a.m. after one or more responses were posted Karl Schneider Posting Freak Posts: 1,792 Threads: 62 Joined: Jan 2005 12-07-2008, 11:53 PM Palmer - I get Chuck's result, which looks strange to me. I assert that ```2.0i-3.0 ``` is improperly formatted, as it appears to be (2.0*i) - 3.0. In "compact" form, the number ought to be displayed as ```2.0-i3.0 ``` Now, here's the way to do it: The HP-42S would display this result more clearly as ```2.0 -i3.0 ``` whereas the polar-format result is displayed as ```3.6 /-56.3 ``` Note that the negative sign precedes the "i" (as it should), while the negative sign follows the angle symbol (as it should). "i" is a multiplicative operand, while the angle symbol is not. -- KS Edited: 8 Dec 2008, 1:38 a.m. Walter B Posting Freak Posts: 4,587 Threads: 105 Joined: Jul 2005 12-08-2008, 01:44 AM The way the 42S displays complex data is the best I know on HP calcs. No troubles with +- following each other immediately, no strange elevated - signs, just ... simply correct :) Palmer O. Hanson, Jr. Posting Freak Posts: 901 Threads: 113 Joined: Jun 2007 12-09-2008, 02:45 AM Quote: I get Chuck's result, which looks strange to me. I can't get Chuck's result unless I am in RPN mode. Am I missing something? Palmer Chuck Senior Member Posts: 320 Threads: 59 Joined: Dec 2006 12-09-2008, 09:32 AM In algebra mode, under display settings there is an option 11. This gives a+bi form. Why not in RPN mode hp? That was a fun Easter egg. Chuck Gene Wright Posting Freak Posts: 1,545 Threads: 168 Joined: Jul 2005 12-09-2008, 02:42 PM which is mentioned in the 35s review published in datafile and on hpcc.org as well as being mentioned in the 35s learning modules! :-) Perhaps a+bi is just too "un-RPN" to be in anything other than algebraic. But, these complex number display modes are mentioned in Datafile V26 Special 35s Issue on page 6. Palmer O. Hanson, Jr. Posting Freak Posts: 901 Threads: 113 Joined: Jun 2007 12-09-2008, 09:50 PM Quote: Perhaps a+bi is just too "un-RPN" to be in anything other than algebraic. But, a display of a + - b i is un-anything! Palmer John B. Smitherman Senior Member Posts: 256 Threads: 4 Joined: Sep 2007 12-09-2008, 10:38 PM It makes you wonder who's designing, writing and testing the software these days. Regards, John Gene Wright Posting Freak Posts: 1,545 Threads: 168 Joined: Jul 2005 12-10-2008, 12:56 PM Perhaps. But I have seen many ways of displaying complex numbers. (0,1) 10THETA30 5i6 and I do remember 5+6i, which is how they were written in my algebra books. The issue is with the unary negative sign in this instance. The 35s provides multiple display formats for complex numbers, which are quite useful (in spite of the badly formed theta character). Don't like a display format? Then choose another. :-) On a more serious note, I do hope everyone is doing well in these challenging times. Stefan Vorkoetter Member Posts: 217 Threads: 21 Joined: Aug 2007 12-10-2008, 04:26 PM Quote: ...who's designing, writing and testing the software these days. Fresh graduates, fresh graduates, and paying customers. Stefan Walter B Posting Freak Posts: 4,587 Threads: 105 Joined: Jul 2005 12-10-2008, 05:35 PM d:D May I say I second your statement though I do not welcome it? d;) Karl Schneider Posting Freak Posts: 1,792 Threads: 62 Joined: Jan 2005 12-11-2008, 01:00 AM Quote: The 35s provides multiple display formats for complex numbers, which are quite useful (in spite of the badly formed theta character). Don't like a display format? Then choose another. :-) Hi, Gene -- All I would require are cartesian and polar display formats that are clear and mathematically correct, like the HP-42S formats I listed earlier in this thread. I have no desire for the "ordered parenthesized pair" format used in the RPL-based models and the HP-71B. And an angle symbol should be utilized -- not a theta, which looks too much like a 0 or 8, and is generally used to denote an angular variable itself, not that the value that follows is an angle. -- KS V-PN Posting Freak Posts: 785 Threads: 13 Joined: Jan 2005 12-11-2008, 06:53 PM Not me - I would have certainly detected the defect. HP people and affiliates still don't see what's wrong... « Next Oldest | Next Newest »

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