Bugs

Percent Difference giving Percent Change

Percent Difference giving Percent Change

Postby macromaniac » Sun Oct 23, 2011 12:56 am
Perhaps not a bug, but when asking for the percent difference between two numbers it actually gives percent change.

Example:
http://www.wolframalpha.com/input/?i=percent+difference+20%2C+30

Formula used:

= (x1 - x2) / x2

Actual Formula:

= 100 * abs((x1 - x2) / ( 2*(x1 + x2) ) )

Source:
http://en.wikipedia.org/wiki/Relative_change_and_difference#Formula
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Re: Percent Difference giving Percent Change

Postby john85 » Sat Nov 12, 2011 12:44 pm
It seems like a bug. I tried to make something similar.
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Re: Percent Difference giving Percent Change

Postby tryggvirafn » Tue Dec 13, 2011 10:02 pm
That sounds like a bug, not a large one but a bug none the less..
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Re: Percent Difference giving Percent Change

Postby vincentroberts » Mon Dec 19, 2011 9:58 am
Yeah, it's a bug! I tried with different figures and got the wrong answer.
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Re: Percent Difference giving Percent Change

Postby kumarsaurabh » Fri Feb 03, 2012 8:53 am
I will request some respected members or moderators to dive in and clear the situation. For an instance , i also thought this was a bug but since its still up , i am in double mind.
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Re: Percent Difference giving Percent Change

Postby akashtablet » Sat Apr 21, 2012 5:43 am
It may be due to the use of abs function which truncates the fractional part of any number.
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