labelr (version 0.1.9)

smerge: Safely Merge Two Data Frames

Description

smerge allows one to merge two data.frames, one or both of which may be labeled, preserving the labelr attributes of the inputted data.frames.

Usage

smerge(x, y, ...)

Value

a data.frame.

Arguments

x

a data.frame to be merged with y.

y

a data.frame to be merged with x.

...

additional arguments passed to base::merge()

Details

Precedence is given to the labels of the first data.frame (argument x), such that, if both data.frames include a label attribute with the same name, the attribute from data.frame x will be preserved, and the same-named attribute from data.frame y will be discarded.

Examples

# assign mtcars to df
df <- mtcars

# assign the rownames to a column
id <- rownames(df)

df <- cbind(id, df)

# split the data.frame into two
df_a <- df[c("id", "am")]
df_b <- df[c("id", "mpg")]

# add value labels to df_a$am
df_a <- add_val_labs(
  data = df_a,
  vars = "am",
  vals = c(0, 1),
  labs = c("automatic", "manual")
)

# add numerical range value labels to df_b$mpg
df_b <- add_quant1(df_b, mpg, qtiles = 4)

# now, safely merge them
df_m <- smerge(df_a, df_b)

head(df_m)

get_val_labs(df_m)