Question

请问R语言在安装pc包时出错是怎么回事

错误提示为：package ‘fpc’ is available as a source package but not as a binary
Warning in install.packages :
package ‘fpc’ is not available (as a binary package for R version 3.1.3)

Answer 1

您好，这样的：
步骤1：打开你电脑中的杀毒软件
步骤2：关掉杀毒软件的实时防护/监控功能
步骤3：在线或本地安装你要装的R安装包
步骤4：安装完R安装包后，重新打开杀毒软件的实时防护/监控功能。
步骤5：在R中运行你刚才安装的包。
sion 3.0.1 (2013-05-16)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=Chinese (Simplified)_People's Republic of China.936
[2] LC_CTYPE=Chinese (Simplified)_People's Republic of China.936
[3] LC_MONETARY=Chinese (Simplified)_People's Republic of China.936
[4] LC_NUMERIC=C
[5] LC_TIME=Chinese (Simplified)_People's Republic of China.936

attached base packages:
[1] stats graphics grDevices utils datasets methods base
>

Answer 2

把表示时间的字符串转成时间类型数据，在R语言里面有两个基本的函数： as.POSIXlt() 和 as.POSIXct()。两者都是S3泛型函数，根据参数的数据类型选择不同的转换方法，除字符串外还能够转换数字、因子等数据类型，适应性很强!