> qqnorm;qqline(w)
function (y, ...)
UseMethod("qqnorm")
<bytecode: 0x00000000003dda48>
<environment: namespace:stats>
错误于int_abline(a = a, b = b, h = h, v = v, untf = untf, ...) :
  plot.new has not been called yet


这是什么原因呢？请各位大神指教,感激不尽。