[R] Issue with formula conversion

Gang Chen gangchen6 at gmail.com
Wed Aug 27 20:19:11 CEST 2014

A random effect formulation for R package nlme is read in as a string
of characters from an input file:

ranEff <- "pdCompSymm(~1+Age)"

I need to convert 'ranEff' to a formula class. However, as shown below:

> as.formula(ranEff)
~1 + Age

the "pdCompSymm" is lost in the conversion. Any solutions? Thanks!


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