R语言使一个数据结构随机排序：随机混排已有数据集（shuffle data.frame list array）、创建一个向量并随机化向量的内容的顺序

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2301_77176803: 为什么这个代码显示Error in Surv(time, status) : object 'status' not found In addition: Warning message: In xtfrm.data.

充值前请看清楚退不了钱: 这个是多分类还是二分类问题

davlid: 修改为正文也可以

fanforfun: 博主你好，请问打开tif影像怎样可以使原始图像颜色不被改变呢？