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So, i've been writing code in R interfacing with mysql, its been fun and the documentation has been useful, learning quite a bit. the only annoying thing i've been encountering is while coding/debugging, my session gets clogged, especially with sql connections. At the end of the code i dbDisconnect, but when the script is stopped by an error, the session stays open. Usually i'll

I'm trying to figure out how to plot basic utility maximization results with R, Ideally I'd like to plot the value of u through x1,x2 space, so you can graph income / substitution effects easily... also, it'd be nice if I could put a linear budget constraint on the graph here's an example with cobb douglas utility u <- function(x) { x1 <- x[1] x2 <- x[2]

The current population survey march supplements contain records on households, families and individuals, each with distinct record types all in the same file. I'm trying to efficiently read these files, the following function reads the data file "indata", the records are described in lists contained in "dd_by_type" and flag_pos gives the character position in the data