[R] Problem with object inside a function
Ronaldo Reis Junior
chrysopa at gmail.com
Sun Apr 20 16:20:21 CEST 2008
Em Dom 20 Abr 2008, Ronaldo Reis Junior escreveu:
> Hi all,
> I have a problem with an object inside a formula in a function that I make.
> I create an object named qvartemp. This object is OK, look the levels:
> > print(levels(qvartemp))
>  "baixomedio" "alto"
> Now I create a new object with a new formula:
> > new.form <- as.formula(gsub(qvar,"qvartemp",as.expression(mma$formula)))
> Look this new object:
> > print(new.form)
> Riqueza ~ Biomassa * qvartemp
> Now here is the problem, I try to update an existing model (mma) changing
> the formula by the new.form
> mmaa <- update(mma,new.form)
> But my function is aborted with this message:
> Error in eval(expr, envir, enclos) : object "qvartemp" not found
> If I create this object qvartemp in R section manually it my function work,
> because it get the object from my workspace (but it is usefull just for
> testing), but my function dont find this object qvartemp created inside the
> If I run all my function line by line without use the function it work, I
> think that is because in this case the object is created in my workspace.
> But when I run a function the object is created only in memory (not in my
> workspece) and in this case update dont find this object.
> Anybody can suggest any Idea to fix it? I necessary I send my function and
> a example.
Completing the problem,
if I use
> mmaa <- glm(new.form)
instead update(mma,new.form) the function work perfectly, but using update I
can generalise my function and I need this. The problem is with update
function, It maybe get the object differently, but I dont find the problem.
Mistaken at the top of one's voice.
-- Ambrose Bierce, "The Devil's Dictionary"
> Prof. Ronaldo Reis Júnior
| .''`. UNIMONTES/Depto. Biologia Geral/Lab. de Biologia Computacional
| : :' : Campus Universitário Prof. Darcy Ribeiro, Vila Mauricéia
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| `- Fone: (38) 3229-8187 | ronaldo.reis em unimontes.br | chrysopa em gmail.com
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