HP Forum Archive 21

[ Return to Index | Top of Index ]

[HP-PRIME CAS] inequations Message #1 Posted by CompSystems on 2 Nov 2013, 10:05 p.m. see screenshot at the end of the next picture solve((ABS(ABS(2*x+1)-5))>2,x); [ENTER] => { -4>x,x>-2 AND 1>x,x>3}

Re: [HP-PRIME CAS] inequations Message #2 Posted by Han on 2 Nov 2013, 10:26 p.m., in response to message #1 by CompSystems Both the HP Prime and the TI nSpire produce correct answers. They just return slightly different representations of the same solution. x>-2 AND x<1 means the same as -2<x<1 A or B or C is the same as A or (B or C).

Re: [HP-PRIME CAS] inequations Message #3 Posted by CompSystems on 2 Nov 2013, 10:49 p.m., in response to message #2 by Han AS(x>-2 AND x<1) == (-2<x<1) Why -2<x<1 => 0 // BUG? Edited: 2 Nov 2013, 11:03 p.m. after one or more responses were posted

Re: [HP-PRIME CAS] inequations Message #4 Posted by Han on 2 Nov 2013, 11:00 p.m., in response to message #3 by CompSystems The inequality > and < have higher priority than AND. So x>-2 AND x<1 is actually (x-2) AND (x<1) … not to be confused with x> (-2 and x) < 1 -- which would not make much sense. Also, the result returns a symbolic object which embeds AND -- which is very different from a result which evaluates binary operation.

[ Return to Index | Top of Index ]

Go back to the main exhibit hall