调用R包中的函数
A package installed on your computer is either a standard package or a package downloaded by you. When you try using functions in the package, however, R cannot find them.
公卫人
Use either the library function or the require function to load the package into R:
> library(packagename)
When you use the library function or the require function, R loads the package into memory and its contents immediately become available to you: 公卫考场
> lda(f ~ x + y)
Error: could not find function "lda"
> library(MASS) # Load the MASS library into memory 公卫家园
> lda(f ~ x + y) # Now R can find the function
Call: 公卫论坛
lda(f ~ x + y)
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