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(-) precedence
12-13-2022, 07:37 PM
Post: #41
RE: (-) precedence
(This applies to modern algebraic calculators that let you enter a whole expression on the input line.)

I think there would be less confusion by getting rid of the '(-)' key and providing some mechanism to for the user to indicate whether they are chaining the from the previous answer or not. The only ambiguous operator is '-' (and possibly '+' for symmetry). There are a few options:

(1). Always chain from the previous answer, automatically inserting 'Ans' (or equivalent) before the operator. Provide some way to suppress the automatic insertion of 'Ans' before an initial '-'. That could be done via a 'Shift', '-' sequence with the shifted function marked as '(-)'. So the '(-)' hasn't really gone away, but is only being used to suppress automatic insertion of 'Ans'.

(2). Only chain from the previous answer (automatically inserting 'Ans') for unambiguous binary operators, but not for an initial '-' which would require 'Ans' to be entered manually before the operator. Make it an unshifted key to reduce keystrokes. This eliminates the need for any keys (or shifted key functions) labelled '(-)'.

(3). Never chain from the previous answer automatically, requiring the user to press an 'Ans' key manually in order to chain from the previous answer. This may be seen as defying tradition and increasing the number of keystrokes, but is more operator-agnostic than (2). Again, there is no need for any keys (or shifted key functions) to be labelled '(-)'.

For all three options, the same thing could be done to '+' for symmetry with '-'.

— Ian Abbott
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Messages In This Thread
(-) precedence - jhallen - 12-08-2022, 01:10 PM
RE: (-) precedence - Thomas Okken - 12-08-2022, 01:30 PM
RE: (-) precedence - jhallen - 12-08-2022, 01:47 PM
RE: (-) precedence - Matt Agajanian - 12-08-2022, 08:25 PM
RE: (-) precedence - Eddie W. Shore - 12-08-2022, 01:41 PM
RE: (-) precedence - Maximilian Hohmann - 12-08-2022, 02:21 PM
RE: (-) precedence - KeithB - 12-08-2022, 02:38 PM
RE: (-) precedence - Maximilian Hohmann - 12-08-2022, 03:38 PM
RE: (-) precedence - KeithB - 12-08-2022, 04:01 PM
RE: (-) precedence - Thomas Okken - 12-08-2022, 05:43 PM
RE: (-) precedence - jhallen - 12-08-2022, 06:27 PM
RE: (-) precedence - Thomas Okken - 12-08-2022, 06:39 PM
RE: (-) precedence - jhallen - 12-08-2022, 06:49 PM
RE: (-) precedence - Albert Chan - 12-08-2022, 07:18 PM
RE: (-) precedence - Thomas Okken - 12-08-2022, 07:04 PM
RE: (-) precedence - Albert Chan - 12-08-2022, 07:33 PM
RE: (-) precedence - Massimo Gnerucci - 12-08-2022, 07:56 PM
RE: (-) precedence - Thomas Okken - 12-08-2022, 09:21 PM
RE: (-) precedence - Matt Agajanian - 12-08-2022, 09:47 PM
RE: (-) precedence - Matt Agajanian - 12-08-2022, 10:02 PM
RE: (-) precedence - Albert Chan - 12-09-2022, 04:02 PM
RE: (-) precedence - Thomas Okken - 12-08-2022, 10:23 PM
RE: (-) precedence - Matt Agajanian - 12-09-2022, 12:15 AM
RE: (-) precedence - KeithB - 12-09-2022, 02:52 PM
RE: (-) precedence - mfleming - 12-10-2022, 01:51 AM
RE: (-) precedence - rprosperi - 12-10-2022, 03:42 AM
RE: (-) precedence - Maximilian Hohmann - 12-10-2022, 04:18 PM
RE: (-) precedence - John Keith - 12-10-2022, 04:38 PM
RE: (-) precedence - toml_12953 - 12-10-2022, 05:57 PM
RE: (-) precedence - rprosperi - 12-10-2022, 06:56 PM
RE: (-) precedence - mfleming - 12-10-2022, 11:23 PM
RE: (-) precedence - John Keith - 12-10-2022, 10:22 PM
RE: (-) precedence - EdS2 - 12-11-2022, 08:29 AM
RE: (-) precedence - Maximilian Hohmann - 12-11-2022, 10:38 AM
RE: (-) precedence - mfleming - 12-11-2022, 01:27 PM
RE: (-) precedence - FLISZT - 12-12-2022, 04:37 PM
RE: (-) precedence - mfleming - 12-12-2022, 10:13 PM
RE: (-) precedence - FLISZT - 12-12-2022, 11:56 PM
RE: (-) precedence - David Hayden - 12-13-2022, 03:59 PM
RE: (-) precedence - Thomas Okken - 12-13-2022, 06:12 PM
RE: (-) precedence - Matt Agajanian - 12-19-2022, 08:56 PM
RE: (-) precedence - David Hayden - 12-21-2022, 12:08 AM
RE: (-) precedence - Albert Chan - 12-18-2022, 03:47 PM
RE: (-) precedence - KeithB - 12-19-2022, 06:28 PM
RE: (-) precedence - ijabbott - 12-13-2022 07:37 PM
RE: (-) precedence - jhallen - 12-20-2022, 04:09 AM
RE: (-) precedence - Matt Agajanian - 12-20-2022, 05:48 AM
RE: (-) precedence - Matt Agajanian - 12-20-2022, 06:07 AM
RE: (-) precedence - Dan C - 12-21-2022, 06:29 PM
RE: (-) precedence - Matt Agajanian - 12-21-2022, 10:28 PM
RE: (-) precedence - Joe Horn - 12-22-2022, 03:03 AM
RE: (-) precedence - Matt Agajanian - 12-22-2022, 07:47 AM
RE: (-) precedence - Sukiari - 12-22-2022, 03:31 AM
RE: (-) precedence - Thomas Okken - 12-22-2022, 05:43 AM
RE: (-) precedence - Sukiari - 12-22-2022, 03:16 PM
RE: (-) precedence - Maximilian Hohmann - 12-22-2022, 05:46 PM
RE: (-) precedence - Sukiari - 12-23-2022, 05:11 AM
RE: (-) precedence - Thomas Okken - 12-23-2022, 07:16 AM
RE: (-) precedence - Sukiari - 12-25-2022, 11:46 PM
RE: (-) precedence - ijabbott - 12-26-2022, 09:43 AM
RE: (-) precedence - Albert Chan - 12-22-2022, 06:05 PM
RE: (-) precedence - Joe Horn - 12-22-2022, 01:25 PM
RE: (-) precedence - ijabbott - 12-22-2022, 09:17 PM
RE: (-) precedence - Albert Chan - 12-23-2022, 12:02 AM
RE: (-) precedence - Matt Agajanian - 12-23-2022, 06:04 AM
RE: (-) precedence - Albert Chan - 12-23-2022, 08:04 AM
RE: (-) precedence - toml_12953 - 12-23-2022, 10:32 AM
RE: (-) precedence - Thomas Okken - 12-23-2022, 03:54 PM
RE: (-) precedence - ijabbott - 12-23-2022, 07:40 PM
RE: (-) precedence - Thomas Okken - 12-23-2022, 07:54 AM
RE: (-) precedence - rprosperi - 12-26-2022, 01:21 AM
RE: (-) precedence - Thomas Okken - 12-26-2022, 06:11 AM
RE: (-) precedence - Sukiari - 12-26-2022, 03:25 PM
RE: (-) precedence - Thomas Okken - 12-26-2022, 06:10 PM
RE: (-) precedence - Eddie W. Shore - 12-26-2022, 03:55 PM
RE: (-) precedence - Sukiari - 12-26-2022, 08:50 PM
RE: (-) precedence - klesl - 12-26-2022, 09:42 PM
RE: (-) precedence - ijabbott - 12-26-2022, 10:54 PM
RE: (-) precedence - Eddie W. Shore - 12-27-2022, 01:33 AM
RE: (-) precedence - Matt Agajanian - 12-26-2022, 08:23 PM
RE: (-) precedence - Thomas Okken - 12-26-2022, 09:00 PM
RE: (-) precedence - Thomas Okken - 12-26-2022, 09:10 PM
RE: (-) precedence - rprosperi - 12-26-2022, 10:00 PM
RE: (-) precedence - FLISZT - 12-27-2022, 02:36 AM



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