Re: [R] building a formula string bit by bit ..

From: Esmail Bonakdarian <esmail.js_at_gmail.com>
Date: Tue, 06 May 2008 15:43:19 -0400

Jorge Ivan Velez wrote:
> Hi Esmail,
>
> Try this:
>
> vars=c('X.1', 'X.2', 'X.3', 'X.4', 'X.5')
> bits=c(1, 0, 1, 1, 0)
> paste(vars[which(bits==1)],collapse="+")
>
> HTH,
>
> Jorge

Wow .. that is beautiful :-) .. and exactly what I was looking for (and suspected existed).

I ended up doing this:

    eqn=(paste(vars[which(bits==1)],collapse=" + "))     eqn=paste(c("Y.data ~"), eqn)
    GLM.9 <- glm(as.formula(eqn) , family=gaussian(identity), data=simpleData)

For some reason I couldn't collapse the two eqn/paste statements into one statement but this seems to work.

Thank again Jorge and everyone else .. this group is a big help.

Esmail

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