Hi All, I have constructed two expressions (e1 & e2). I can see that they are not identical, but I cannot figure out how they differ.
############### dat <- mtcars e1 <- expression(with(data = dat, lm(mpg ~ hp))) e2 <- as.expression(substitute(with(data = dat, lm(f)), list(f = mpg ~ hp))) str(e1) str(e2) all.equal(e1, e2) identical(e1, e2) # false eval(e1) eval(e2) ################ The context is trying to use a list of formulae to generate several models from a multiply imputed dataset. The package I am using (mice) has methods for with() and that is how I can (easily) get the pooled results. Passing the formula directly does not work, so I was trying to generate the entire call and evaluate it as if I had typed it at the console, but I am missing something (probably rather silly). Thanks, Josh -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ ______________________________________________ R-help@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.
