I’d like to take data of the form before = data.frame(attr = c(1,30,4,6), type=c(‘foo_and_bar’,’foo_and_bar_2′)) attr type 1 1 foo_and_bar 2 30 foo_and_bar_2 3 4 foo_and_bar 4 6 foo_and_bar_2 and use split() on the column “type” from above to get something like this: attr type_1 type_2 1 1 foo bar 2 30 foo bar_2 3 4 … Read more
I have a list of many data.frames that I want to merge. The issue here is that each data.frame differs in terms of the number of rows and columns, but they all share the key variables (which I’ve called “var1” and “var2” in the code below). If the data.frames were identical in terms of columns, … Read more
If I have a vector of type character, how can I concatenate the values into string? Here’s how I would do it with paste(): sdata = c(‘a’, ‘b’, ‘c’) paste(sdata[1], sdata[2], sdata[3], sep =”) yielding “abc”. But of course, that only works if I know the length of sdata ahead of time. 8 Answers 8
I have a number, for example 1.128347132904321674821 that I would like to show as only two decimal places when output to screen (or written to a file). How does one do that? x <- 1.128347132904321674821 EDIT: The use of: options(digits=2) Has been suggested as a possible answer. Is there a way to specify this within … Read more
I plot a simple linear regression using R. I would like to save that image as PNG or JPEG, is it possible to do it automatically? (via code) There are two different questions: First, I am already looking at the plot on my monitor and I would like to save it as is. Second, I … Read more
I’m curious to know if R can use its eval() function to perform calculations provided by e.g. a string. This is a common case: eval(“5+5”) However, instead of 10 I get: [1] “5+5” Any solution? 7 Answers 7
I have a list and I want to remove a single element from it. How can I do this? I’ve tried looking up what I think the obvious names for this function would be in the reference manual and I haven’t found anything appropriate. 18 Answers 18
I’m having trouble rearranging the following data frame: set.seed(45) dat1 <- data.frame( name = rep(c(“firstName”, “secondName”), each=4), numbers = rep(1:4, 2), value = rnorm(8) ) dat1 name numbers value 1 firstName 1 0.3407997 2 firstName 2 -0.7033403 3 firstName 3 -0.3795377 4 firstName 4 -0.7460474 5 secondName 1 -0.8981073 6 secondName 2 -0.3347941 7 secondName … Read more
A very newbish question, but say I have data like this: test_data <- data.frame( var0 = 100 + c(0, cumsum(runif(49, -20, 20))), var1 = 150 + c(0, cumsum(runif(49, -10, 10))), date = seq(as.Date(“2002-01-01″), by=”1 month”, length.out=100) ) How can I plot both time series var0 and var1 on the same graph, with date on the … Read more
I am trying to make a bar graph where the largest bar would be nearest to the y axis and the shortest bar would be furthest. So this is kind of like the Table I have Name Position 1 James Goalkeeper 2 Frank Goalkeeper 3 Jean Defense 4 Steve Defense 5 John Defense 6 Tim … Read more
