Re: Odd [math] behaviour
This WebDNA talk-list message is from 2003
It keeps the original formatting.
numero = 52771
interpreted = N
texte = John, Can I ask what exactly is wrong with using the [format]? It returned the answer he wanted. it has always returned the correct answer dealing with math in the cart adding cost. RonnyMc ----- Original Message ----- From: "John Peacock"
To: "WebDNA Talk" Sent: Thursday, September 11, 2003 11:14 AM Subject: Re: Odd [math] behaviour > Pat Holliday wrote: > > > But that's not the answer - the answer is 700.1.. > > > > Why doesn't WebDNA do straightforward calculations by default? > > > > It's your computer, not WebDNA. Floating point math is not exact; it is > approximate. Certain combinations will not ever work in the way you are used to > "on paper" so you just have to deal with it. > > I see that round() is not a valid function within the [math] (which is dumb), so > you'll have to brew your own: > > [math]floor((6000.4-5300.3+0.005)*100)/100[/math] > > will display what you would expect. > > NOTE: because you are using floating point, even the above may not work all of > the time, because some decimal representations are not possible to accurately > store using floating point numbers (which are stored internally as a power of 2 > not 10). > > HTH > > John > > > -- > John Peacock > Director of Information Research and Technology > Rowman & Littlefield Publishing Group > 4501 Forbes Boulevard > Suite H > Lanham, MD 20706 > 301-459-3366 x.5010 > fax 301-429-5748 > > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list . > To unsubscribe, E-mail to: > To switch to the DIGEST mode, E-mail to > Web Archive of this list is at: http://webdna.smithmicro.com/ ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
Associated Messages, from the most recent to the oldest:
John, Can I ask what exactly is wrong with using the [format]? It returned the answer he wanted. it has always returned the correct answer dealing with math in the cart adding cost. RonnyMc ----- Original Message ----- From: "John Peacock" To: "WebDNA Talk" Sent: Thursday, September 11, 2003 11:14 AM Subject: Re: Odd [math] behaviour > Pat Holliday wrote: > > > But that's not the answer - the answer is 700.1.. > > > > Why doesn't WebDNA do straightforward calculations by default? > > > > It's your computer, not WebDNA. Floating point math is not exact; it is > approximate. Certain combinations will not ever work in the way you are used to > "on paper" so you just have to deal with it. > > I see that round() is not a valid function within the [math] (which is dumb), so > you'll have to brew your own: > > [math]floor((6000.4-5300.3+0.005)*100)/100[/math] > > will display what you would expect. > > NOTE: because you are using floating point, even the above may not work all of > the time, because some decimal representations are not possible to accurately > store using floating point numbers (which are stored internally as a power of 2 > not 10). > > HTH > > John > > > -- > John Peacock > Director of Information Research and Technology > Rowman & Littlefield Publishing Group > 4501 Forbes Boulevard > Suite H > Lanham, MD 20706 > 301-459-3366 x.5010 > fax 301-429-5748 > > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list . > To unsubscribe, E-mail to: > To switch to the DIGEST mode, E-mail to > Web Archive of this list is at: http://webdna.smithmicro.com/ ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
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