r - 如何将gpclibPermit()设置为TRUE

当我运行gpclibPermit()时，我得到了答案FALSE。如何将其更改为TRUE？

最佳答案

我自己一直在处理gpclibPermit问题。您没有提供可复制的示例，但是我想您正在像这样进行讨论:

library(maptools)
Checking rgeos availability: FALSE
Note: when rgeos is not available, polygon geometry computations in maptools depend
    on gpclib, which has a restricted licence. It is disabled by default;
to enable gpclib, type gpclibPermit()
> gpclibPermitStatus()
[1] FALSE
> gpclibPermit()
[1] FALSE
> gpclibPermitStatus()
[1] FALSE

在这一点上，有助于查看gpclibPermit和gpclibPermitStatus的实际作用:

> gpclibPermit
function ()
{
if ("gpclib" %in% .packages(all.available = TRUE))
    assign("gpclib", TRUE, envir = .MAPTOOLS_CACHE)
if (gpclibPermitStatus())
    warning("support for gpclib will be withdrawn from maptools at the next major release")
gpclibPermitStatus()
}
<environment: namespace:maptools>
> gpclibPermitStatus
function ()
    get("gpclib", envir = .MAPTOOLS_CACHE)
<environment: namespace:maptools>

也就是说，除非您安装了maptools软件包，否则您不能授予gpclib使用gpclib的权限。

install.packages("gpclib")
library(maptools)
Loading required package: sp
Checking rgeos availability: FALSE
Note: when rgeos is not available, polygon geometry computations in maptools depend on gpclib,  which has a restricted licence. It is disabled by default; to enable gpclib, type gpclibPermit()

> gpclibPermit()
[1] TRUE
Warning message:
In gpclibPermit() :
support for gpclib will be withdrawn from maptools at the next major release
> gpclibPermitStatus()
[1] TRUE