在 Rmarkdown 中添加到 plot 曲线或直线

Question

plot(model$residuals,
abline(h=0,col="red")

when i run abline() function, return this error:

Error in int_abline(a = a, b = b, h = h, v = v, untf = untf, ...): plot.new has not been called yet

How can i solve it?

Answer 1

First plot your residuals then call abline seperately:

df <- data.frame(x = 1:10, y = 1:10 + rnorm(10))
model <- lm(y ~ x, data = df)
plot(df$x, model$residuals)
abline(h = 0, col = "red")

^{Created on 2020-04-27 by the reprex package (v0.3.0)}