https://blog.youkuaiyun.com/dollyhzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/dollyh/article/details/78072906https://blog.youkuaiyun.com/dollyh/article/details/78072906dollyhSat, 23 Sep 2017 19:47:14 +0800https://blog.youkuaiyun.com/dollyh/article/details/74332208https://blog.youkuaiyun.com/dollyh/article/details/74332208dollyhTue, 04 Jul 2017 16:21:55 +0800https://blog.youkuaiyun.com/dollyh/article/details/72625910https://blog.youkuaiyun.com/dollyh/article/details/72625910dollyhMon, 22 May 2017 14:07:08 +0800https://blog.youkuaiyun.com/dollyh/article/details/72611820https://blog.youkuaiyun.com/dollyh/article/details/72611820dollyhSun, 21 May 2017 20:37:34 +0800https://blog.youkuaiyun.com/dollyh/article/details/72605601https://blog.youkuaiyun.com/dollyh/article/details/72605601dollyhSun, 21 May 2017 20:14:29 +0800https://blog.youkuaiyun.com/dollyh/article/details/72602447https://blog.youkuaiyun.com/dollyh/article/details/72602447dollyhSun, 21 May 2017 19:24:26 +0800https://blog.youkuaiyun.com/dollyh/article/details/72598886https://blog.youkuaiyun.com/dollyh/article/details/72598886dollyhSun, 21 May 2017 16:01:27 +0800https://blog.youkuaiyun.com/dollyh/article/details/71908430https://blog.youkuaiyun.com/dollyh/article/details/71908430dollyhSat, 13 May 2017 21:55:12 +0800 mode(1:5) [1] "numeric"class() 判断数据的类> class(1:5) [1] "integer"根据数据的类，采用相应的处理方法。 以下函数，主要用在函数处理异常时使用，目的是增强程序的稳健性。 is.numeric() #返回值为TRUE或FALSE>]]>https://blog.youkuaiyun.com/dollyh/article/details/71816861https://blog.youkuaiyun.com/dollyh/article/details/71816861dollyhSat, 13 May 2017 15:22:19 +0800https://blog.youkuaiyun.com/dollyh/article/details/71811511https://blog.youkuaiyun.com/dollyh/article/details/71811511dollyhSat, 13 May 2017 14:57:55 +0800