HP calcs are really not that accurate..

[DA74254]

I just sat here, reading the reverb memory thread and my thoughts started to spin about the sqrt(2).

To put it straight; HP sucks at math!
At least in RPN or in "inexact" mode

I put 2 on the stack and sqrt it 5 times, then squared it back. All my 5 HP's returned 1.99999999979 instead of 2.0. That goes for the Android Pro version as well.

On my Android phone and tab, I have the free42 (of course), realcalc+, RPNcalc, Prime and the default calc.

*All*, except the HP returns 2 after the 5-step sqrt/squared.

HW 49G+, 50G (in exact mode) and Prime in CAS returned correct results, though.
Maxima math on my PC returned correct result.

I'm not angry with HP, just very, very disappointed..