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I have a dataset of the form Year tosk.fai tosk.isd tosk.gr ....... tosk.total hysa.fai hysa.isd ... and so on. I want to sum all the columns using the first four letters in the columns label(e.g. 'tosk', 'hysa' etc.). How can you do that? Also, the sums should be without the '.total'column (e.g. 'tosk.total') as this serves as a check that

I'm about to write my thesis in economics and will need to setup and solve a system of non-linear equations. At our university we usually use GAMS for this, and though GAMS is a fine program, it bugs me a that I won't be able to run my code after I finish my thesis without buying a license for the program(about $3.500 :-(( ) So I've looked around for NL-stuff for R, but I

Hi, I am plotting the residuals of z like this plot(resid(z)) and I want the title of the graph to be main="Residuals from regression [name of regression]" where in this case "z" is the name of the regression. Is there a way to automaticall put the name of the regression in the title, e.g if the regressions name changes to "y", the title changes accordingly?

Hi, I have two catagorical vectors like this; x = c(1, 2, 4, 2, 1) y = c(2, 4, 2 ,4, 1) I want to set up a barplot with the catagories 1-4 horizontally and number of occurances vertically for each vector x,y. I've tried boxplot(table(x,y), beside=T) and boxplot(c(x,y), beside=T) among others, but can't get it to work...Any ideas? I'd apppreciate any help