If I want to add a field to a given data frame and setting it equal to an existing field in the same data frame based on a condition on a different (existing) field.If I want to add a field to a given data frame
阅读背景：
根据R中第三个字段的条件，将数据帧新字段的值设置为另一个字段
来源：互联网
分享到：
