06-02-2014, 10:37 PM
A friend of mine has advised me today there is following quick precision test when testing better calculators in the shop:
Take 1.0000001 and do x^2 27times..
Windows calculator (most probably using at least 34digits decimal fp) gives me:
674530.4707410845593826891780296
Wp34s emulator shows:
674530.47054
It seems to me all the relevant digits in this test fits into 39digits standard precision the wp34s uses. Why the diff then?
UPDATE:
Basic precision:
Take 1.0000001 and do x^2 27times..
Windows calculator (most probably using at least 34digits decimal fp) gives me:
674530.4707410845593826891780296
Wp34s emulator shows:
674530.47054
It seems to me all the relevant digits in this test fits into 39digits standard precision the wp34s uses. Why the diff then?
UPDATE:
Basic precision:
Code:
Calculator Display Display-INT Note
=======================================================================
W.Alfa (Ref) 674530.470741 .4707410845 The reference
-----------------------------------------------------------------------
Citizen SRP-325G 674530.4707411 ? basic precision, web source
Citizen SRP-400G 674530.4707411 ? basic precision, web source
Canon X Mk I Pro 674530.4707 .4707399243
Casio CPad300Plus 674530.4706 web source
WP-34s 674530.47054 .4705396874
WP-31s 674530.47054 .4705396874
Canon F-715SG 674530.4702 .470205499
Olympia LCD-8110 674530.4702 .470205499
Ti-80 674530.318 .3180426
TI-83 Plus Silver 674529.4131 web source
Ti-89 674529.413051 .41305068
TI-92 Plus 674529.413051 web source
Casio fx-9860 674529.1121 web source
Casio FX-6910AG 674529.1097 web source
Sharp EL-W506X 674523.3747 .3747398
SR-52 674520.6053 web source
TI-59 674520.6053 web source
HP-50g 674514.86877 .86877
HP-35s 674514.86877 .86877
HP-39GII 674514.86877 web source
HP Prime 674514.86877 web source
HP-49g 674514.86877 web source
HP-30b 674514.86877 web source
Sigma GC 500 674512.576 .576
Casio FX-602p 674494.0561 web source
HP-25 674494.05 .0561
Anitech SC100 674492.7511 .75112
Casio fx-3650P 674475.4416 web source
Casio FX-702p 674475.3961 web source
Casio fx-991MS 674472.4416 .441611
TI-57 674432.82 web source
Truly SC106A 674294.1172 .1172
Casio FX-502p 674185.8477 web source