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LastXY Register for WP34S
12-01-2014, 06:45 PM
Post: #12
RE: LastXY Register for WP34S
What do we need LASTx for?
  1. For error correction after executing a wrong dyadic function. (For a wrong monadic function, just invert it.)
  2. For convenient reentry of a multi-digit number.
Please compare the manual. RCL L puts the old x right where it belongs for reverting the erroneous operation or reusing it.

Now, if I understood your suggestion correctly, with a LASTxy (or CPX RCL L) for error correction you'd push the previous (erroneous) x into Z, which means you have to get rid of it in an extra step. So I don't see a benefit in recalling last x and y here. Yes, there may be a slight difference to the original calculation in the 16th decimal. But it's an error correction after all, so I won't care for that.

Instead of LASTxy, I'd prefer an UNDO recalling the entire stack as it was before that erroneous last operation. KISS (but it has to be determined whether that's viable with the WP 34S).

Just my 20m€.
d:-)
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Messages In This Thread
LastXY Register for WP34S - PANAMATIK - 11-30-2014, 08:51 PM
RE: LastXY Register for WP34S - brouhaha - 12-01-2014, 05:10 PM
RE: LastXY Register for WP34S - Bit - 12-01-2014, 06:48 PM
RE: LastXY Register for WP34S - Paul Dale - 12-01-2014, 09:29 PM
RE: LastXY Register for WP34S - PANAMATIK - 12-01-2014, 10:11 PM
RE: LastXY Register for WP34S - Paul Dale - 12-01-2014, 10:26 PM
RE: LastXY Register for WP34S - Paul Dale - 12-01-2014, 10:29 PM
RE: LastXY Register for WP34S - PANAMATIK - 12-01-2014, 10:46 PM
RE: LastXY Register for WP34S - PANAMATIK - 11-30-2014, 10:37 PM
RE: LastXY Register for WP34S - Paul Dale - 11-30-2014, 11:34 PM
RE: LastXY Register for WP34S - BarryMead - 12-01-2014, 05:44 AM
RE: LastXY Register for WP34S - Dieter - 12-01-2014, 06:56 AM
RE: LastXY Register for WP34S - Paul Dale - 12-01-2014, 09:08 AM
RE: LastXY Register for WP34S - PANAMATIK - 12-01-2014, 11:07 AM
RE: LastXY Register for WP34S - Bit - 12-01-2014, 01:57 PM
RE: LastXY Register for WP34S - PANAMATIK - 12-01-2014, 07:12 AM
RE: LastXY Register for WP34S - walter b - 12-01-2014 06:45 PM
RE: LastXY Register for WP34S - PANAMATIK - 12-01-2014, 07:28 PM
RE: LastXY Register for WP34S - walter b - 12-01-2014, 09:14 PM
RE: LastXY Register for WP34S - BarryMead - 12-01-2014, 09:15 PM



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