Calculator test
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12-08-2024, 07:36 AM
(This post was last modified: 12-08-2024 07:49 AM by C.Ret.)
Post: #20
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RE: Calculator test
(12-06-2024 10:27 PM)Commie Wrote: Key in \(ln(^-1)\) into your best calculator and hit return, your calculator should give \(\pi\cdot i\) Hi Commie, your best calculators have a RETURN key ? (12-07-2024 03:33 AM)Thomas Klemm Wrote:(12-06-2024 11:19 PM)Steve Simpkin Wrote: I thought it would provide a complex answer like the HP-42S.Complex results for real-number operations can be disabled with REALRES. This function sets flag 74. This observation exactly match how the HP-15C works, except there is no specific command apart setting Flg 8 which is the complex-mode toggle or indicator. (12-07-2024 01:22 PM)AnnoyedOne Wrote: I activated complex mode (g SF 8), entered -1, then g Ln and got Right. There is an alternative way of promoting complex mode on the HP-15C; it is simply to enter arguments as complex number. So the same observation can be made, from 'standard' calculator state (the state we get after a reset [ON]+[ - ] ). In 'real entry mode', results are strictly real: [ 1 ][CHS][g][ LN ] display Error 0. In 'extended complex stack mode', using one of the many entry methods: [ 1 ][CHS][ENTER][ 0 ][f][ I ][g][ LN ] set the flag 8 and display real part 0.0000 and [f][(i)] or [f][Re⇋Im] display imaginary part 3.1416. Unfortunately, there is no other way to quit the complex extend mode than clearing flag 8 by [f][ CF ][ 8 ] or by resetting the calculator. Note, that trying the equation \(e^{\pi\cdot i}=^-1\) the opposite direction, show an interesting fact (or flow) about HP-15C precision in complex computations: [g][ ∏ ][f][Re⇋Im][ ◀- ][ e^x ] exactly display real part -1.0000 but the imaginary part is not exactly what we expect; [f][(i)] or [f][Re⇋Im] display 4.1000 -10. (12-07-2024 08:23 PM)Commie Wrote: I've checked my hp15ce and yes it works, I'm growing to like my 15ce! Really Commie? Even is there is no RETURN key on our beloved device? |
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Messages In This Thread |
Calculator test - Commie - 12-06-2024, 10:27 PM
RE: Calculator test - Steve Simpkin - 12-06-2024, 11:19 PM
RE: Calculator test - Johnh - 12-06-2024, 11:20 PM
RE: Calculator test - Commie - 12-07-2024, 10:32 AM
RE: Calculator test - naddy - 12-06-2024, 11:31 PM
RE: Calculator test - Thomas Klemm - 12-07-2024, 03:33 AM
RE: Calculator test - rprosperi - 12-07-2024, 03:34 AM
RE: Calculator test - naddy - 12-07-2024, 08:11 PM
RE: Calculator test - StephenG1CMZ - 12-07-2024, 08:49 AM
RE: Calculator test - rprosperi - 12-07-2024, 01:14 PM
RE: Calculator test - Idnarn - 12-07-2024, 09:47 AM
RE: Calculator test - AnnoyedOne - 12-07-2024, 01:22 PM
RE: Calculator test - Johnh - 12-07-2024, 07:17 PM
RE: Calculator test - AnnoyedOne - 12-07-2024, 07:23 PM
RE: Calculator test - Geoff Quickfall - 12-07-2024, 07:50 PM
RE: Calculator test - JurgenRo - 12-07-2024, 08:12 PM
RE: Calculator test - Steve Simpkin - 12-07-2024, 08:23 PM
RE: Calculator test - Geoff Quickfall - 12-07-2024, 08:20 PM
RE: Calculator test - Commie - 12-07-2024, 08:23 PM
RE: Calculator test - C.Ret - 12-08-2024 07:36 AM
RE: Calculator test - naddy - 12-08-2024, 06:55 PM
RE: Calculator test - Thomas Klemm - 12-08-2024, 09:30 AM
RE: Calculator test - AnnoyedOne - 12-08-2024, 01:20 PM
RE: Calculator test - Commie - 12-08-2024, 02:06 PM
RE: Calculator test - carey - 12-08-2024, 03:15 PM
RE: Calculator test - Commie - 12-08-2024, 05:34 PM
RE: Calculator test - carey - 12-08-2024, 08:38 PM
RE: Calculator test - Commie - 12-08-2024, 08:52 PM
RE: Calculator test - AnnoyedOne - 12-08-2024, 04:04 PM
RE: Calculator test - naddy - 12-08-2024, 06:37 PM
RE: Calculator test - AnnoyedOne - 12-08-2024, 07:02 PM
RE: Calculator test - dm319 - 12-08-2024, 08:13 PM
RE: Calculator test - AnnoyedOne - 12-09-2024, 12:30 PM
RE: Calculator test - Maximilian Hohmann - 12-09-2024, 01:03 PM
RE: Calculator test - vaklaff - 12-10-2024, 09:42 AM
RE: Calculator test - RPNerd - 12-10-2024, 10:47 AM
RE: Calculator test - carey - 12-10-2024, 10:53 AM
RE: Calculator test - naddy - 12-10-2024, 12:44 PM
RE: Calculator test - John Keith - 12-10-2024, 04:26 PM
RE: Calculator test - carey - 12-10-2024, 05:22 PM
RE: Calculator test - Steve Simpkin - 12-08-2024, 05:36 PM
RE: Calculator test - dm319 - 12-08-2024, 02:05 PM
RE: Calculator test - Thomas Klemm - 12-08-2024, 02:51 PM
RE: Calculator test - AnnoyedOne - 12-08-2024, 03:34 PM
RE: Calculator test - dm319 - 12-08-2024, 05:33 PM
RE: Calculator test - AnnoyedOne - 12-08-2024, 05:39 PM
RE: Calculator test - dm319 - 12-08-2024, 06:04 PM
RE: Calculator test - John Keith - 12-08-2024, 06:48 PM
RE: Calculator test - Thomas Klemm - 12-08-2024, 04:01 PM
RE: Calculator test - Thomas Klemm - 12-08-2024, 04:17 PM
RE: Calculator test - Thomas Klemm - 12-08-2024, 06:31 PM
RE: Calculator test - Commie - 12-08-2024, 07:35 PM
RE: Calculator test - dm319 - 12-09-2024, 11:44 PM
RE: Calculator test - naddy - 12-10-2024, 12:34 AM
RE: Calculator test - AnnoyedOne - 12-10-2024, 01:32 PM
RE: Calculator test - Commie - 12-10-2024, 02:49 PM
RE: Calculator test - AnnoyedOne - 12-10-2024, 03:59 PM
RE: Calculator test - carey - 12-10-2024, 06:12 PM
RE: Calculator test - Commie - 12-10-2024, 07:25 PM
RE: Calculator test - Thomas Klemm - 12-08-2024, 08:01 PM
RE: Calculator test - Johnh - 12-08-2024, 08:02 PM
RE: Calculator test - Thomas Klemm - 12-08-2024, 08:18 PM
RE: Calculator test - dm319 - 12-08-2024, 08:26 PM
RE: Calculator test - Idnarn - 12-10-2024, 05:34 AM
RE: Calculator test - Gil - 12-08-2024, 11:38 PM
RE: Calculator test - Thomas Klemm - 12-08-2024, 11:46 PM
RE: Calculator test - gentzel - 12-09-2024, 06:27 PM
RE: Calculator test - Johnh - 12-10-2024, 12:28 PM
RE: Calculator test - AnnoyedOne - 12-10-2024, 01:45 PM
RE: Calculator test - Commie - 12-10-2024, 05:44 PM
RE: Calculator test - Idnarn - 12-10-2024, 06:49 PM
RE: Calculator test - Commie - 12-10-2024, 07:18 PM
RE: Calculator test - dm319 - 12-10-2024, 10:26 PM
RE: Calculator test - AnnoyedOne - Yesterday, 01:37 PM
RE: Calculator test - Maximilian Hohmann - Yesterday, 02:04 PM
RE: Calculator test - AnnoyedOne - Yesterday, 02:12 PM
RE: Calculator test - Maximilian Hohmann - Yesterday, 02:28 PM
RE: Calculator test - AnnoyedOne - Yesterday, 03:27 PM
RE: Calculator test - dm319 - Yesterday, 06:35 PM
RE: Calculator test - dm319 - 12-10-2024, 10:58 PM
RE: Calculator test - Commie - 12-10-2024, 11:52 PM
RE: Calculator test - naddy - Yesterday, 12:05 AM
RE: Calculator test - Thomas Klemm - Yesterday, 02:16 AM
RE: Calculator test - Johnh - Yesterday, 04:43 AM
RE: Calculator test - Commie - Yesterday, 01:56 PM
RE: Calculator test - Commie - Yesterday, 06:19 PM
RE: Calculator test - Idnarn - Yesterday, 08:12 PM
RE: Calculator test - Commie - Yesterday, 09:22 PM
RE: Calculator test - naddy - Yesterday, 11:14 PM
RE: Calculator test - klesl - Yesterday, 06:25 PM
RE: Calculator test - AnnoyedOne - Yesterday, 06:29 PM
RE: Calculator test - cdmackay - Yesterday, 07:03 PM
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