[R] for loop, error in model frame.default ... variable lengths differ

[Jeff Newmiller]

No data, not reproducible.

I think you should be using na.omit, though.
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Sent from my phone. Please excuse my brevity.

Peter Keller <kellerp.l at gmail.com> wrote:

>I'm failing to get a for loop working.  I'm sure it's something simple,
>and I
>have found some posts relating to it, but I'm just not understanding
>why
>this isn't working. 
>
>I have a data frame and would like to loop through specific column
>names,
>using aggregate() within a for loop.  There are NA's scattered
>throughout
>the data frame and I'm thinking it has something to do with that, but I
>haven't been able to fix it.
>
>vars <- colnames(df)[c(10,12,16,18,20,21,24:29,45)]
> for(i in 1:length(vars)) {
>    aggregate(colnames(df)[i] ~ x1 + x2 + x3, df, mean,
>na.action=na.exclude)
>    }
>
>I get this error: 
>Error in model.frame.default(formula = colnames(df)[i] ~ x1 + x2 +   : 
>  variable lengths differ (found for 'x1')
>
>There are probably much better ways to do this, and I would be happy to
>get
>suggestions, but mostly I would like to know why the code isn't
>working.
>
>Thanks-
>Peter
>
>--
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>http://r.789695.n4.nabble.com/for-loop-error-in-model-frame-default-variable-lengths-differ-tp4630698.html
>Sent from the R help mailing list archive at Nabble.com.
>
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