Top "R-faq" questions

Convert data.frame column format from character to factor

I would like to change the format (class) of some columns of my data.frame object (mydf) from charactor to …

r dataframe character r-faq

How to save a plot as image on the disk?

I plot a simple linear regression using R. I would like to save that image as PNG or JPEG, is …

r plot ggplot2 lattice r-faq

Replace all 0 values to NA

I have a dataframe with some numeric columns. Some row has a 0 value which should be considered as null in …

r r-faq

How to import multiple .csv files at once?

Suppose we have a folder containing multiple data.csv files, each containing the same number of variables but each from …

r csv import r-faq

Order Bars in ggplot2 bar graph

I am trying to make a bar graph where the largest bar would be nearest to the y axis and …

r ggplot2 r-faq

Generate a dummy-variable

I have trouble generating the following dummy-variables in R: I'm analyzing yearly time series data (time period 1948-2009). I have …

r r-faq

ggplot with 2 y axes on each side and different scales

I need to plot a bar chart showing counts and a line chart showing rate all in one chart, I …

r ggplot2 r-faq

How to make a great R reproducible example

When discussing performance with colleagues, teaching, sending a bug report or searching for guidance on mailing lists and here on …

r r-faq

Combine two data frames by rows (rbind) when they have different sets of columns

Is it possible to row bind two data frames that don't have the same set of columns? I am hoping …

r dataframe r-faq

How can I trim leading and trailing white space?

I am having some troubles with leading and trailing white space in a data.frame. For example, I like to …

r whitespace trim removing-whitespace r-faq