R中的功能组合(以及高级功能) [英] Function Composition in R (and high level functions)

问题描述

R中是否有类似函数组合的东西?

Is there something like a function composition in R?

我认为在haskell中，它就像(.)"之类，而在agda中，它是ring操作符.

I think in haskell it's somthing like "(.)" and in agda it's the ring operator.

此外，我在R中找到了有关高级功能编程的信息. 我发现了功能减少"，地图"，过滤器" ...，还有更多功能吗?有指针吗?

Also, I find litte information on high level functional programming in R. I found the Functions "Reduce", "Map", "Filter"..., are there more? Any pointers?

推荐答案

您可以使合成功能如下:

You may make compositing function like this:

composite<-function(f,g) function(...) f(g(...))

f<-function(x) x+1;
g<-function(x) x*2;
composite(f,g)(7)
composite(g,f)(7)

或对此进行操作.

关于第二点，有很多这样的观点；我认为使用最多的是* apply系列(apply，mapply，tapply，lapply，apply ...).

About the second point, there are lots of such; I think the most used are the *apply family (sapply, mapply, tapply, lapply, apply...).

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