checkColumns - Check data.frame for valid columns and issue message if invalid

Description

Check data.frame for valid columns and issue message if invalid

Usage

checkColumns(data, columns, logic = c("all", "any"))

Arguments

data
data.frame to check.
columns
vector of column names to check.
logic
one of "all" or "any" controlling whether all, or at least one, of the columns must be valid, respectively.

Value

TRUE if columns are valid and a string message if not.

Examples

df <- data.frame(A=1:3, B=4:6, C=rep(NA, 3))
checkColumns(df, c("A", "B"), logic="all")

[1] TRUE

checkColumns(df, c("A", "B"), logic="any")

[1] TRUE

checkColumns(df, c("A", "C"), logic="all")

[1] "The column C contains no data"

checkColumns(df, c("A", "C"), logic="any")

[1] TRUE

checkColumns(df, c("A", "D"), logic="all")

[1] "The column D was not found"

checkColumns(df, c("A", "D"), logic="any")

[1] TRUE