Delta Percentage (Texas TI-58/59)

[Dieter]

(07-26-2016 04:11 AM)Gerson W. Barbosa Wrote:  TI-66:

Code:

...
004 STO
005 00
006 =
007 /
008 RCL
009 00
...

CLR 19.6 x<>t 19.81 D --> 1.071428571

You do not have to occupy a data register, also CLR is not required if you use brackets.
It can be done this way (keycodes for TI58/59):

Code:

000 76 LBL
001 11 D
002 53 (
003 53 (
004 32 x<>t
005 75 -
006 32 x<>t
007 54 )
008 94 +/-
009 55 /
010 32 x<>t
011 65 x
012 01 1
013 00 0
014 00 0
015 54 )
016 92 RTN

This way the Δ% operation can also be used in chain calculations.

Example:

Code:

   3  [x]                         3.
19,60 [x<>t] 19,81 [D]   1.071428571
      [=]                3.214285714

As an additional benefit, the t-register on exit holds the absolute change. ;-)

Dieter