Web2 Answers Sorted by: 2 You can use either table or count as.data.frame (table (rownames (mtcars))) Or library (plyr) count (rownames (mtcars)) If you need the count for one of the column, as.data.frame (table (yourdf$id)) Share Improve this answer Follow edited Jul 17, 2015 at 19:21 answered Jul 17, 2015 at 19:13 akrun 864k 37 523 647 WebUse the nrow () function to get the number of rows of a dataframe in R. It counts the rows (including the ones with NA values). To omit the rows with any missing values, apply the …
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WebStack Overfill Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Your Build your employer brand … WebNov 29, 2016 · If you don't know the row number, but do know some values then you can use subset x <- structure (list (A = c (5, 3.5, 3.25, 4.25, 1.5 ), B = c (4.25, 4, 4, 4.5, 4.5 ), C = c (4.5, 2.5, 4, 2.25, 3 ) ), .Names = c ("A", "B", "C"), class = "data.frame", row.names = c (NA, -5L) ) subset (x, A ==5 & B==4.25 & C==4.5) Share Improve this answer
WebJun 19, 2024 · tl;dr: row wise, you'll want sum (!complete.cases (DF)), or, equivalently, sum (apply (DF, 1, anyNA)) There are a number of different ways to look at the number, proportion or position of NA values in a data frame: Most of these start with the logical data frame with TRUE for every NA, and FALSE everywhere else. For the base dataset airquality WebJan 5, 2024 · You can simply do: mtcars %>% group_by (cyl) %>% summarise (rows = n ()) > mtcars %>% group_by (cyl) %>% summarise (rows = n ()) # A tibble: 3 x 2 cyl rows …
WebUsually when I want to count the frequency of different values for one variable I use the table function instead of aggregate. You can pass the output of table to the data.frame function to get the data structure you want (I used setNames to set the variable names): WebMar 21, 2012 · Create a new variable Count with a value of 1 for each row: df1 ["Count"] <-1 Then aggregate dataframe, summing by the Count column: df2 <- aggregate (df1 [c ("Count")], by=list (Year=df1$Year, Month=df1$Month), FUN=sum, na.rm=TRUE) Share Improve this answer edited Jul 17, 2024 at 22:29 thelatemail 89.6k 12 125 187 answered …
WebIf NULL (the default), counts the number of rows in each group. If a variable, computes sum (wt) for each group. sort If TRUE, will show the largest groups at the top. name The …
WebPart of R Language Collective Collective 11 I am trying to get a simple way to count the number of distinct categories in a column of a dataframe. For example, in the iris data frame, there are 150 rows with one of the columns being species, of which there are 3 different species. toga dies in the animeWebDec 30, 2024 · Use the data.frame (table ()) Function to Count Number of Rows in R The data.frame (table ()) function creates a table with the count of different factor values. It counts the total unique rows of a column. We can easily pass the required column of the DataFrame to the function. See the following code snippet. toga eatingWebSep 28, 2024 · How to Perform a COUNTIF Function in R Often you may be interested in only counting the number of rows in an R data frame that meet some criteria. Fortunately this is easy to do using the following basic syntax: sum (df$column == value, na.rm=TRUE) The following examples show how to use this syntax in practice on the following data frame: people mover for sale perth waWebrow_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). However, this function is designed to work nicely within a pipe-workflow and allows select-helpers for selecting variables and the return value is always a data frame (with one variable). people mover hatWebJun 29, 2015 · My solution would be, provided that the 2-column table is called dataset and the string to look for is mystring: countOccurr = function (text,motif) { res = gregexpr (motif,text,fixed=T) [ [1]] ifelse (res [1] == -1, 0, length (res)) } dataset = cbind (dataset, count = vapply (dataset [,2], countOccurr, 1, motif=mystring)) peoplemover disney worldWebSep 28, 2024 · Often you may be interested in only counting the number of rows in an R data frame that meet some criteria. Fortunately this is easy to do using the following … toga drawing black and whiteWebSep 25, 2014 · Suppose you want to find how many rows are there in your data when x is 0. This could be done by: nrow (subset (data, x=="0") 'data' is the object name for your dataset in R EDIT: I am seeing your edited dataframe now. You could use this to solve your problem: table (data$type, data$x) Share Improve this answer Follow answered Sep 25, … people mover hire brisbane