七度&光 2011-02-01 11:52 采纳率: 22.2%
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删除 data.frame 中带有所有或部分 NAs (缺失值)的行

I'd like to remove the lines in this data frame that:

a) contain NAs across all columns. Below is my example data frame.

             gene hsap mmul mmus rnor cfam
1 ENSG00000208234    0   NA   NA   NA   NA
2 ENSG00000199674    0   2    2    2    2
3 ENSG00000221622    0   NA   NA   NA   NA
4 ENSG00000207604    0   NA   NA   1    2
5 ENSG00000207431    0   NA   NA   NA   NA
6 ENSG00000221312    0   1    2    3    2

Basically, I'd like to get a data frame such as the following.

             gene hsap mmul mmus rnor cfam
2 ENSG00000199674    0   2    2    2    2
6 ENSG00000221312    0   1    2    3    2

b) contain NAs in only some columns, so I can also get this result:

             gene hsap mmul mmus rnor cfam
2 ENSG00000199674    0   2    2    2    2
4 ENSG00000207604    0   NA   NA   1    2
6 ENSG00000221312    0   1    2    3    2

转载于:https://stackoverflow.com/questions/4862178/remove-rows-with-all-or-some-nas-missing-values-in-data-frame

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  • bug^君 2011-02-01 12:21
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    Also check complete.cases :

    > final[complete.cases(final), ]
                 gene hsap mmul mmus rnor cfam
    2 ENSG00000199674    0    2    2    2    2
    6 ENSG00000221312    0    1    2    3    2
    

    na.omit is nicer for just removing all NA's. complete.cases allows partial selection by including only certain columns of the dataframe:

    > final[complete.cases(final[ , 5:6]),]
                 gene hsap mmul mmus rnor cfam
    2 ENSG00000199674    0    2    2    2    2
    4 ENSG00000207604    0   NA   NA    1    2
    6 ENSG00000221312    0    1    2    3    2
    

    Your solution can't work. If you insist on using is.na, then you have to do something like:

    > final[rowSums(is.na(final[ , 5:6])) == 0, ]
                 gene hsap mmul mmus rnor cfam
    2 ENSG00000199674    0    2    2    2    2
    4 ENSG00000207604    0   NA   NA    1    2
    6 ENSG00000221312    0    1    2    3    2
    

    but using complete.cases is quite a lot more clear, and faster.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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