如何从保存的文件中加载数值而不是硬编码系数？

Question

如何从保存或转储文件加载数字？这是我到目前为止的代码示例：

t = lm(cars$dist~cars$speed)# build linear regression and get coefficients. 
car_speed = seq(cars$speed)
D.hat = -17.579 + 3.932 * car_speed