[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]

*Subject*: **Re: [office-formula] constraint of ACOT**

*From*:**"Andreas J. Guelzow" <aguelzow@math.concordia.ab.ca>***To*: office-formula@lists.oasis-open.org*Date*: Wed, 06 Jan 2010 10:19:50 -0700

Hi Rob, On Wed, 2010-01-06 at 12:04 -0500, robert_weir@us.ibm.com wrote: > Is the objection over the reference to PI() rather than directly using the > Greek letter Pi? > > Or is the choice of convention the problem? > > According to http://mathworld.wolfram.com/InverseCotangent.html there are > two conventions: (0,Pi) or (-Pi/2, Pi/2). The former is continuous, while > that later has a discontinuity at 0. No, my problem is much more pedestrian: If a constraint is violated the function should return an error. So how can a constraint talk about the function result? Suppose the return value is a number not in the range from 0 to PI(), then by the return value must be an error, since the constraint is violated. But if it is an error then it doesn't violate teh constriant anymore.... I think that should not be a constraint. (We might want to add to the semantics that we are returning the principal value or the value derived from the branch through (1,PI()/4, but that wasn't my problem.) Andreas > "Andreas J. Guelzow" <aguelzow@math.concordia.ab.ca> wrote on 01/06/2010 > 11:15:44 AM: > > > > > ACOT has the constraint "The result must be between 0 and PI()." This > > doe snot look like a valid constraint to me. > > > > ANdreas > > -- > > Andreas J. Guelzow, PhD, FTICA > > Mathematical & Computing Sciences > > Concordia University College of Alberta > > > > > --------------------------------------------------------------------- > To unsubscribe from this mail list, you must leave the OASIS TC that > generates this mail. Follow this link to all your TCs in OASIS at: > https://www.oasis-open.org/apps/org/workgroup/portal/my_workgroups.php > -- Andreas J. Guelzow, PhD, FTICA Mathematical & Computing Sciences Concordia University College of Alberta

**Follow-Ups**:**Re: [office-formula] constraint of ACOT***From:*robert_weir@us.ibm.com

**References**:**constraint of ACOT***From:*"Andreas J. Guelzow" <aguelzow@math.concordia.ab.ca>

**Re: [office-formula] constraint of ACOT***From:*robert_weir@us.ibm.com

[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]