Until the matter is finished being debated and a plan of action is
decided on, a function could be used such as
function numsAreEqual n1, n2, epsilon
return abs(n1 - n2) < epsilon
end numsAreEqual
If your testing of the immediate comparison indicates to you that
there are no roundoff problems, then use =, otherwise use this
function or your own variant with an epsilon that seems prudent.
Date: Fri, 8 May 2009 14:49:44 -0700
From: Bob Sneidar <[email protected]>
Subject: Re: Math issue, isn't it?
To: How to use Revolution <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Yes, but my point was if someone was creating an Accounting
application, he would have to know to wrap all of his equations in
value(), otherwise he could not do any logical comparisons on equated
values. While your approach works, I think that the better approach is
for this issue to be addressed in a future update. If there is no
present way to prevent 283.67 - 150 - 133.67 from equaling
0.00000000000002842 other than wrapping it in a conversion function,
then that needs to be addressed. I failed 6th grade math and even I
know that is wrong! :-)
Bob Sneidar
IT Manager
Logos Management
Calvary Chapel CM
On May 8, 2009, at 2:11 PM, Scott Rossi wrote:
Recently, Bob Sneidar wrote:
Then the question becomes, should the IDE be doing math on the real
number or the displayed number? I vote for the displayed number
because that means I can have some kind of control over the outcome.
Clearly if some calculation that comes up with a number cannot be
compared to a literal for equal/not equal, then all accounting is
out
the window. This cannot be an intended behavior!!?!
As others have said, the issue arises due to the decimal values -- if
integers are used, the comparison works "correctly" (and I'd prefer
not to
argue over what is "correct"). I don't know if this is an acceptable
solution but when I use the value function, I get the expected
result:
put value(283.67 - 150 - 133.67) = 0
Regards,
Scott Rossi
Creative Director
Tactile Media, Multimedia & Design
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