zhangice001 写了一个比较无聊的例子,你参考一下吧。
set.seed(12345)
beta1 <- rnorm(10)
beta2 <- rnorm(10)
beta3 <- rnorm(10)
plot(x = beta1, y = beta1 * beta3 / beta2)
text(-1, -1, expression(frac(beta[1] * beta[3], beta[2])), cex = 3)
text(0, -1, expression(frac(beta[1] %*% beta[3], beta[2])), cex = 3)