Function builtin_seq 

fn builtin_seq(
    args: &[RValue],
    named: &[(String, RValue)],
) -> Result<RValue, RError>

Generate a regular sequence.

@param from starting value (default 1) @param to ending value (default 1) @param by increment (default 1 or -1) @param length.out desired length of the sequence @return numeric vector