记忆和向量化自定义函数

I want to know how to vectorize and memoize a custom function in R. It seems my way of thinking is not aligned with R's way of operation. So, I gladly welcome any links to good reading material. For example, R inferno is a nice resource, but it didn't help to figure out memoization in R.I want to know how to vectorize and memoize a c