已经解决啦~~

请问你是如何安装的

我也是一直安装不了，安装提示下面的，下面是只装了SP吗，readShapePoly()不能使用，请问怎么解
> install.packages("maptools")
also installing the dependency ‘sp’

trying URL 'http://cran.rstudio.com/bin/windows/contrib/3.1/sp_1.2-3.zip'
Content type 'application/zip' length 1572259 bytes (1.5 MB)
opened URL
downloaded 1.5 MB

trying URL 'http://cran.rstudio.com/bin/windows/contrib/3.1/maptools_0.8-39.zip'
Content type 'application/zip' length 1816489 bytes (1.7 MB)
opened URL
downloaded 1.7 MB

package ‘sp’ successfully unpacked and MD5 sums checked
package ‘maptools’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
        C:\Users\gufq\AppData\Local\Temp\RtmpaqDlVz\downloaded_packages

请问是怎么解决这个问题的呢？？?