[Rd] Potential bug in update.formula when updating offsets

[peter dalgaard]

Terry, Martin

Would this happen to be related to the "indexing term objects" issue that has been bothering you?

-pd

> On 5 Aug 2019, at 21:44 , Paul Buerkner <paul.buerkner using gmail.com> wrote:
> 
> Hi all,
> 
> update.formula does not seem to correctly update (i.e. remove in my case)
> offset terms.
> 
> Here is an example:
> 
> update(~x + offset(z), ~ . - offset(z))
>> ~x + offset(z)
> 
> Also:
> update(~x, ~ . - offset(z))
>> ~x + offset(z)
> 
> In both cases, I would expect the result
>> ~x
> 
> as  - <term>  should remove <term> from the formula as happens for instance
> in:
> 
> update(~x + z, ~ . - z)
>> ~x
> 
> I don't know if this behavior is intentional but I would say it is at least
> unfortunate.
> 
> Paul
> 
> 	[[alternative HTML version deleted]]
> 
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-- 
Peter Dalgaard, Professor,
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