isaac <br /> x <- seq(-3, 3, length = 101)<br /> y <- dnorm(x) # assign standard normal values to y<br /> plot(x, y, type = 'l') # 'l' stands for line</p> <p>错误于plot.xy(xy, type, ...) : 绘图种类'1'不对<br /> 大家说为什么这里总是显示 绘图种类不对啊??? </p>