### Sample random rows in dataframe?

I am struggling to find the appropriate function that would return a specified number of rows picked up randomly wit...

### Determining if a matrix is diagonalizable in the R Programming Language?

I have a matrix and I would like to know if it is diagonalizable. How do I do this in the R programming language? ...

### Return a data frame from function?

I have the following code inside a function Myfunc<- function(directory, MyFiles, id = 1:332) { # uncomment the ...

### How can I replace TRUE and FALSE values with 1 and 0 when exporting data in R??

I am exporting data from R with the command: write.table(output,file="data.raw", na "-9999",sep="\t",row.names=F,co...

### The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe?

R provides two different methods for accessing the elements of a list or data.frame: [] and [[]]. What is the diffe...

### What's the difference between integer class and numeric class in R?

I want to preface this by saying I'm an absolute programming beginner, so please excuse how basic this question is. ...

### Special variables in ggplot (..count.., ..density.., etc.)?

Consider the following lines. p <- ggplot(mpg, aes(x=factor(cyl), y=..count..)) p + geom_histogram() p + sta...

### How to extract Month from date in R?

I am using the lubridate package and applying the month function to extract month from date. I ran the str command o...

### R not finding package even after package installation?

I have always worked with the zoo package, that I have installed a long time ago. Today, I created a new R script, a...

### Flipping the X and Y values in a plot in R (with the data changing axes as well)?

How do I make a plot in R so that the value of a variable displays along the X axis and the variable names go vertic...

### How to increase the font size of ggtitle in ggplot2?

I would like to increase the font size of ggtitle and also the font should be bold. My code is as follows. ggplot(d...

### Piping stdin to R?

I am having trouble piping stdin to an R script. Here is my toy script test.R: #!/usr/bin/env Rscript while(length...

### Convert Factor to Date/Time in R?

This is the information contained within my dataframe: ## minuteofday: factor w/ 89501 levels "2013-06-01 08:07:00"...

### How to declare a vector of zeros in R?

I suppose this is trivial, but I can't find how to declare a vector of zeros in R. For example, in Matlab, I would...