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...e shell version of R and always change to the directory containing my saved session before launching, but I prefer to use the GUI version. Is there a command to tell R to load a session from a particular location? How do other people with Macs do this? -- Bill McNeill http://staff.washington.edu/billmcn/index.shtml [[alternative HTML version deleted]]

...39;t figure out what those manipulations would be. Basically I want to use a factor table as a hash table, but I haven't been able to figure out how to do this, which makes me think I'm not conceptualizing this is the correct R-ish way. Thanks. -- Bill McNeill http://staff.washington.edu/billmcn/index.shtml [[alternative HTML version deleted]]

...A better implementation of gmm_data() would generate data points for an arbitrary number of mixture components (i.e. an arbitrary number of rows in the data frame). How do I do this? I'm sure it's simple, but I can't figure it out. Thanks. -- Bill McNeill http://staff.washington.edu/billmcn/index.shtml

...ach individual column, e.g. > tapply(data$falcon, data$class, sum) birds planes 78 1 But I can't figure out what command will do these sums for the entire data frame without me having to specify the column names in the command. Thanks. -- Bill McNeill http://staff.washington.edu/billmcn/index.shtml