promise already under evaluation: recursive default argument reference or earlier problems?
Formal arguments of the form x=x cause this. Eliminating the two instances where they occur we get:
r
Subscripts in plots in R
expression is your friend:
Merge r brings error “‘by’ must specify uniquely valid columns”
Rather give names of the column on which you want to merge:
What is the difference between = and ==?
It depends on context as to what = means. == is always for testing equality. = can be in most cases used as a drop-in replacement for <-, the assignment operator.> x = 10 > x [1] 10 used as the separator for key-value pairs used to assign values to arguments in function calls.rnorm(n = 10, mean = 5, sd = 2) … Read more
How to increase font size in a plot in R?
You want something like the cex=1.5 argument to scale fonts 150 percent. But do see help(par) as there are also cex.lab, cex.axis, …
Warning message: In `…` : invalid factor level, NA generated
The warning message is because your “Type” variable was made a factor and “lunch” was not a defined level. Use the stringsAsFactors = FALSE flag when making your data frame to force “Type” to be a character.
standard deviation on dataframe does not work
sd on data.frames has been defunct since R-3.0.0: Use sapply(x, sd) instead.
How to create an empty matrix in R?
The default for matrix is to have 1 column. To explicitly have 0 columns, you need to write A better way would be to preallocate the entire matrix and then fill it in
Error in dev.off() : cannot shut down device 1 (the null device)
Turns out that the only problem with this was with where the file was trying to save to. I altered the code to save to a different directory and it worked fine
How to install RHadoop packages (Rmr, Rhdfs, Rhbase)?
Download packages rhdfs, rhbase, rmr2 and plyrmr from https://github.com/RevolutionAnalytics/RHadoop/wiki and install them as below :