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Re: Putting features in vs. leaving them out, especially functions



Arnold
Thanks, that modifies my opinion. But what's the justification for including these particular ones? What about something like
  (log(1-x) - x)/x^2  or  (atan(x) - x)/x^3  or  ...?
When you need THOSE, do you code them yourself? 
John

On 25 May 2011, at 12:18, Arnold Neumaier wrote:
> On Wed, May 25, 2011 10:06, John Pryce wrote:
>>  Stuff like (1-cos x)/x^2: people to whom these are important are
>>  competent enough to code them themselves; they are unlikely to be
>>  performance-critical.
> 
> They are needed for the efficient implementations of slopes and
> second-order slopes, which we use in our COCONUT global optization
> environment almost as much as CP.