Function interp_points 

fn interp_points(
    args: &[RValue],
    named: &[(String, RValue)],
    context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Add points to the current plot.

@param x numeric vector of x-coordinates @param y numeric vector of y-coordinates @param col color @param pch point character @param cex character expansion factor @return NULL (invisibly)