Dplyr 1.0.4引入了两个配套的过滤函数:if_any()和if_all()。在这种情况下，if_all()伴随函数将特别有用:

a)删除所有列中包含NAs的行

df %>% 
  filter(if_all(everything(), ~ !is.na(.x)))

这一行将只保留那些列中没有NAs的行。

b)删除仅在某些列中包含NAs的行

cols_to_check = c("rnor", "cfam")

df %>% 
  filter(if_all(cols_to_check, ~ !is.na(.x)))

这一行将检查任何指定的列(cols_to_check)是否有NAs，并只保留没有NAs的那些行。

我是个合成器:)。这里我把答案组合成一个函数:

#' keep rows that have a certain number (range) of NAs anywhere/somewhere and delete others
#' @param df a data frame
#' @param col restrict to the columns where you would like to search for NA; eg, 3, c(3), 2:5, "place", c("place","age")
#' \cr default is NULL, search for all columns
#' @param n integer or vector, 0, c(3,5), number/range of NAs allowed.
#' \cr If a number, the exact number of NAs kept
#' \cr Range includes both ends 3<=n<=5
#' \cr Range could be -Inf, Inf
#' @return returns a new df with rows that have NA(s) removed
#' @export
ez.na.keep = function(df, col=NULL, n=0){
    if (!is.null(col)) {
        # R converts a single row/col to a vector if the parameter col has only one col
        # see https://radfordneal.wordpress.com/2008/08/20/design-flaws-in-r-2-%E2%80%94-dropped-dimensions/#comments
        df.temp = df[,col,drop=FALSE]
    } else {
        df.temp = df
    }

    if (length(n)==1){
        if (n==0) {
            # simply call complete.cases which might be faster
            result = df[complete.cases(df.temp),]
        } else {
            # credit: http://stackoverflow.com/a/30461945/2292993
            log <- apply(df.temp, 2, is.na)
            logindex <- apply(log, 1, function(x) sum(x) == n)
            result = df[logindex, ]
        }
    }

    if (length(n)==2){
        min = n[1]; max = n[2]
        log <- apply(df.temp, 2, is.na)
        logindex <- apply(log, 1, function(x) {sum(x) >= min && sum(x) <= max})
        result = df[logindex, ]
    }

    return(result)
}

尝试na.omit (your.data.frame)。至于第二个问题，试着把它作为另一个问题发布(为了清晰)。

Tidyr有一个新函数drop_na:

library(tidyr)
df %>% drop_na()
#              gene hsap mmul mmus rnor cfam
# 2 ENSG00000199674    0    2    2    2    2
# 6 ENSG00000221312    0    1    2    3    2
df %>% drop_na(rnor, cfam)
#              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

使用dplyr包，我们可以过滤NA如下:

dplyr::filter(df,  !is.na(columnname))

如果你只想删除所有列中有NAs的行，下面是解决方案:

df %>%
    filter(!if_all(everything(), ~  is.na(.)))