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Incorrect Simplify
10-02-2015, 08:23 PM
Post: #1
Incorrect Simplify
Can somebody check this for me. I don't have the latest software on my work calculator.

Integrate sqrt(1/x-1) from 1/2 to 1 with the minimum or none simplification set in CAS settings.

It returns correctly 1/4*pi - sqrt(1/4).

However, upon simplifying (or copy and pasting) it will convert the sqrt(1/4) to sqrt(1)/4, obviously quite wrong!!

Setting the simplifying to maximum gives (pi-2)/4 which is correct.

However the incorrect simplifying is troubling. Does this also occur with the latest firmware?

Thanks,
CHUCK
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10-02-2015, 08:39 PM (This post was last modified: 10-04-2015 06:07 PM by Tim Wessman.)
Post: #2
RE: Incorrect Simplify
It does. The issue is with the parsing of the copied text into the 2d mode. Specifically, the sqrt(1/4) turns into sqrt(1)/4.

To be clear, pressing the "simplify" button works fine. It is exclusively the copy/paste part that has an issue. What appears to be happening is the sqrt -> √ replacement is incorrectly identifying that parenthesis are not required. Definitely now on the list for correction. Many thanks!

TW

Although I work for the HP calculator group, the views and opinions I post here are my own.
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