怎么添加其他的镜像源
时间: 2024-09-09 16:01:55 浏览: 47
在R语言中添加额外的镜像源主要是为了提高软件包下载的速度,特别是当CRAN主服务器速度较慢或者访问受限时。你可以按照以下步骤添加镜像源:
1. **Ubuntu/Mac/Linux**: 使用 `BiocManager::use_mirror()` 函数来自Bioconductor(针对生物信息学软件包),例如添加中国科学院的源:
```r
if (!requireNamespace("BiocManager", quietly = TRUE)) {
install.packages("BiocManager")
}
BiocManager::use_mirror(url = "http://mirrors.sustc.edu.cn/bioconductor/")
```
对于CRAN,可以使用`getOption("repos")`查看当前源,然后添加新的源:
```r
repos原有 <- getOption("repos")
repos$CRAN <- "新CRAN镜像URL"
options(repos=repos原有)
```
2. **Windows**: 打开R Studio的“首选项”>“ Sweave ”>“ 全局”,添加新的镜像URL到"Additional repositories"部分。
记住每次更换镜像源后,需要刷新R缓存才能生效。可以在安装软件包前运行 `library()`, `require()`, 或 `install.packages()` 来触发镜像源的切换。
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