r.md

R

read data

Read data from clipboard in OS X

df = read.delim(pipe("pbpaste"), sep=",")

dplyr

Summarize data, go from long to wide, replace NAs with 0

df %>%
  group_by(var1, var2) %>%
  summarize(count = n()) %>%
  spread(var2, count) %>%    # tidyr
  replace(is.na(.), 0)

view source

Returns source for S3/S4 functions. If using RStudio, place cursor over function and press the F2 key to automatically pull up source.

# s3
getAnywhere(power.prop.test)
# s4
getMethod("chol2inv", "diagonalMatrix")