daff is an R package that can find difference in values between
data.frames, store this difference, render it and apply this
difference to patch a data.frame. It can also merge two versions of a
data.frame having a common parent. It wraps the
daff.js library using the
V8 package.
The diff format is described in https://paulfitz.github.io/daff-doc/spec.html.
Functions:
- diff:
diff_data - patch:
patch_data - write/read diff:
read_diffandwrite_diff - render to html:
render_diff - merge two tables based on a same version:
merge_data
You can install the development version of daff from GitHub with:
# install.packages("devtools") devtools::install_github("edwindj/daff")
Calculate the difference between a reference and a changed data.frame
library(daff) y <- iris[1:3,] x <- y x <- head(x,2) # remove a row x[1,1] <- 10 # change a value x$hello <- "world" # add a column x$Species <- NULL # remove a column patch <- diff_data(y, x) # write a patch to disk write_diff(patch, "patch.csv")
render_diff(patch) will generate the following HTML page:
Patch a data.frame using a diff generated with diff_data.
# read a diff from disk patch <- read_diff("patch.csv") # apply patch y_patched <- patch_data(y, patch)
Merge two data.frames that have diverged from a common parent
data.frame.
parent <- a <- b <- iris[1:3,] a[1,1] <- 10 b[2,1] <- 11 # succesful merge merge_data(parent, a, b) parent <- a <- b <- iris[1:3,] a[1,1] <- 10 b[1,1] <- 11 # conflicting merge (both a and b change same cell) merged <- merge_data(parent, a, b) merged #note the conflict #find out which rows contain a conflict which_conflicts(merged)