在自定义 R 包中使用"Matrix"包方法

Question

以下代码是自定义 R 包中的一个函数。

#' @import Matrix
#' @export
asdf <- function(){
    u <- Matrix(0,5,5)
    rowSums(u)
}

当我加载包并执行它时，我得到以下输出。

> library(devtools); document(clean=TRUE); load_all()
Loading required package: roxygen2
Updating gm documentation
Loading gm
Loading required namespace: Matrix
Loading required package: Matrix
Writing gm.generate.Rd
Loading gm
> asdf
function(){
    u <- Matrix(0,5,5)
    rowSums(u)
}
<environment: namespace:gm>
>
> asdf()
Error in rowSums(u) (from tmp.R#5) : 'x' must be an array of at least two dimensions

因此，即使加载了矩阵包，即使矩阵包在NAMESPACE中导入，矩阵包中的rowSums也不会被调度：

export(asdf)
import(Matrix)

在全局环境中，矩阵包确实已加载，并且rowSums函数可用。

> showMethods(rowSums)
Function: rowSums (package base)
x="ANY"
x="CsparseMatrix"
x="ddenseMatrix"
x="denseMatrix"
x="dgCMatrix"
x="dgeMatrix"
x="diagonalMatrix"
x="dsCMatrix"
    (inherited from: x="CsparseMatrix")
x="igCMatrix"
x="indMatrix"
x="lgCMatrix"
x="ngCMatrix"
x="RsparseMatrix"
x="TsparseMatrix"

但是，如果我在全局环境中定义相同的函数，则一切正常：

> qwer <- function(){
    u <- Matrix(0,5,5)
    rowSums(u)
}
qwer <- function(){
+     u <- Matrix(0,5,5)
+     rowSums(u)
+ }
> qwer()
[1] 0 0 0 0 0

我对此感到困惑。我做错了什么？

====

====================================================================

在NAMESPACE文件中：

Package: hola
Type: Package
Title: What the package does (short line)
Version: 1.0
Date: 2014-01-03
Author: Who wrote it
Maintainer: Who to complain to <[e-mail]>
Description: More about what it does (maybe more than one line)
License: What license is it under?

在DESCRIPTION文件中：

export(asdf)
import(Matrix)
importFrom(Matrix,Matrix)
importFrom(Matrix,rowSums)

在R/asdf.R文件中：

#' @import Matrix
#' @importFrom Matrix Matrix
#' @importFrom Matrix rowSums
#' @export
asdf <- function(){
    u <- Matrix(0,5,5)
    rowSums(u)
}

Answer 1

您应该阅读 1.5.6 具有 S4 类和方法的命名空间

将此添加到您的命名空间文件中：

import(Matrix)

或更好：

importFrom(Matrix, rowSums)

此外，还需要在描述文件中Imports: Matrix。

最低套餐如下：

---

DESCRIPTION文件：

Package: hola
Type: Package
Title: What the package does (short line)
    Version: 1.0
    Date: 2014-01-03
Author: Who wrote it
Maintainer: Who to complain to <[e-mail]>
Description: More about what it does (maybe more than one line)
License: What license is it under?
Imports:
    Matrix

---

NAMESPACE文件：

export(asdf)
importFrom(Matrix,Matrix)
importFrom(Matrix,rowSums)

---

R/asdf.R文件：

#' @importFrom Matrix Matrix
#' @importFrom Matrix rowSums
#' @export
asdf <- function(){
    u <- Matrix(0,5,5)
    rowSums(u)
}

---