R中S4个对象的总和 [英] sum of S4 objects in R

问题描述

我有一个S4类，我想定义这些对象的线性组合.

I have a S4 class and I would like to define the linear combination of these objects.

是否可以在此特定类上分派*和+函数?

Is it possible to dispatch * and + functions on this specific class?

推荐答案

下面是一个示例:

setClass("yyy", representation(v="numeric"))

setMethod("+", signature(e1 = "yyy", e2 = "yyy"), function (e1, e2) e1@v + e2@v)
setMethod("+", signature(e1 = "yyy", e2 = "numeric"), function (e1, e2) e1@v + e2)

然后

> y1 <- new("yyy", v = 1)
> y2 <- new("yyy", v = 2)
> 
> y1 + y2
[1] 3
> y1 + 3
[1] 4

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