The error means that R could not find the variable mentioned in the error message. The easiest way to reproduce the error is to type the name of a variable that doesn’t exist. (If you’ve defined x already, use a different variable name.) x ## Error: object ‘x’ not found The more complex version of … Read more
To access a column, use: my_data[ , cond] or my_data[[cond]] The ith row can be accessed with: my_data[i, ] Combine both to obtain the desired value: my_data[i, cond] or my_data[[cond]][i]
With lubridate library(lubridate) ymd(“2010/03/17”) – years(2)
sas7bdat worked fine for all but one of the files I was looking at (specifically, this one); in reporting the error to the sas7bdat developer, Matthew Shotwell, he also pointed me in the direction of Hadley’s haven package in R which also has a read_sas method. This method is superior for two reasons: 1) It … Read more
You can try as.vector(t(test)). Please note that, if you want to do it by columns you should use unlist(test).
Globally solution during all the session options(digits=16) > x [1] 1.00042589212565 or locally just for x: sprintf(“%.16f”, x) [1] “1.0004258921256499”
10% is per definition not a numeric vector. Therefore, the answer NA is correct. You can convert a character vector containing these numbers to numeric in this fashion: percent_vec = paste(1:100, “%”, sep = “”) as.numeric(sub(“%”, “”, percent_vec)) This works by using sub to replace the % character by nothing.
You can set repos in your .Rprofile to restore your choice every time you start R Edit: to be more precise: Add options(repos=structure(c(CRAN=”YOUR FAVORITE MIRROR”))) to your .Rprofile Alternatively, you can set the mirror site-wide in your Rprofile.site. The location of the file is given by ?Startup: The path of this file is taken from … Read more
Getting help on a function that you know the name of Use ? or, equivalently, help. ?mean help(mean) # same For non-standard names use quotes or backquotes; see An Introduction to R: Getting help with functions and features: For a feature specified by special characters, the argument must be enclosed in double or single quotes, … Read more
Most of the relevant information can be found by looking at ?S3 or ?UseMethod, but in a nutshell: S3 refers to a scheme of method dispatching. If you’ve used R for a while, you’ll notice that there are print, predict and summary methods for a lot of different kinds of objects. In S3, this works … Read more