[R] Problem with object inside a function

From: Ronaldo Reis Junior <chrysopa_at_gmail.com>
Date: Sun, 20 Apr 2008 10:40:54 -0300

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))

[1] "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 function.

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.


Everywhere is within walking distance if you have the time.
                -- Steven Wright.

> Prof. Ronaldo Reis Júnior
| .''`. UNIMONTES/Depto. Biologia Geral/Lab. de Biologia Computacional | : :' : Campus Universitário Prof. Darcy Ribeiro, Vila Mauricéia | `. `'` CP: 126, CEP: 39401-089, Montes Claros - MG - Brasil | `- Fone: (38) 3229-8187 | ronaldo.reis_at_unimontes.br | chrysopa_at_gmail.com | http://www.ppgcb.unimontes.br/ | ICQ#: 5692561 | LinuxUser#: 205366 ______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Received on Sun 20 Apr 2008 - 14:06:45 GMT

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