In R, what is the most efficient/idiomatic way to count the number of TRUE values in a logical vector? I can think of two ways: · Up vote 196 ... ... <看更多>

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row_count() mimics base R's rowSums() , with sums for a specific value indicated by count . Hence, it is equivalent to rowSums(x == count, na.rm = TRUE) . ... <看更多>

If `NULL` (the default), counts the number of rows in each group. #' * If a variable, computes `sum(wt)` for each group. #' @param sort If `TRUE`, ... ... <看更多>

I have a large amount of Data where I have to count meassurments per one ID. What I already did was creating a Data Frame over all Files and I omited the NAs. ... <看更多>