qc It is often needed to address variables in the data.frame in the such
dfs[ , c("var1", "var2", "var3")].
qc ("quoted c") is a
shortcut for the such cases to reduce keystrokes. With
qc you can write:
dfs[ , qc(var1, var2, var3)].
qe returns list of expression.
unquoted names of variables in
Vector of characters or expressions
## qc qc(a, b, c) identical(qc(a, b, c), c("a", "b", "c")) mtcars[, qc(am, mpg, gear)] ## qe qe(mrset(a1 %to% a6), mrset(b1 %to% b6), mrset(c1 %to% c6))
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