[R] specifying plot symbol sizes in qplot or ggplot2

Hi. first things first ... thanks for ggplot2. Now my question. I'm using qplot to generate a plot as follows where X,Y,Z, A are columns in a dataframe. qplot(X, Y, data=XYDATA, color=Z, geom=c("point"), size=A) This works as expected. Factor A has three levels so there are three sizes of the

Re: [R] Problem with ldply

Thanks for teaching me something new. :) -- View this message in context: http://r.789695.n4.nabble.com/Problem-with-ldply-tp2219094p2220473.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://sta

[R] Problem with ldply

I've examining a number of linear regression models on a large dataset following the basic ideas presented here http://www.r-bloggers.com/r-calculating-all-possible-linear-regression-models-for-a-given-set-of-predictors/ Calculating all possible linear regressions . I run into a problem with ldpl