r number of rows in dataframe

How do I get the number of rows of a data.frame in R? – Cross …

dataset will be a data frame. As I don’t have forR.csv , I’ll make up a small data frame for illustration: set.seed(1) dataset < data.frame(A = sample(c(NA, 1:100), 1000, rep = TRUE), B = rnorm(1000)) > head(dataset) A B 1 26 0.07730312 2 37 0.29686864 3 57 1.18324224 4 91 0.01129269 5 20 …

R: Number of rows for a DataFrame

nrow {SparkR}, R Documentation. Number of rows for a DataFrame. Description. Returns number of rows in a DataFrames. Usage. ## S4 method for signature ‘ DataFrame’ nrow(x). [Package SparkR version 1.5.1 Index]

R: The Number of Rows/Columns of an Array

The Number of Rows/Columns of an Array. Description. nrow and ncol return the number of rows or columns present in x . NCOL and NROW do the same treating a vector as 1column matrix. Usage. nrow(x) ncol(x) NCOL(x) NROW(x). Arguments. x. a vector, array or data frame. Value. an integer of length 1 or NULL .

Dataframe – count number of rows in a data frame in R based on group

Here’s an example that shows how table(.) (or, more closely matching your desired output, data.frame(table(.)) does what it sounds like you are asking for. Note also how to share reproducible sample data in a way that others can copy and paste into their session. Here’s the (reproducible) sample data:

R – Count number of rows matching a criteria – Stack Overflow

sum is used to add elements; nrow is used to count the number of rows in a rectangular array (typically a matrix or data.frame); length is used to count the number of elements in a vector. You need to apply these functions correctly. All of your solutions show a fundamental misunderstanding if the use of sum …

R – Create a data.frame with m columns and 2 rows – Stack Overflow

Does m really need to be a data.frame() or will a matrix() suffice? m < matrix(0, ncol = 30, nrow = 2). You can wrap a data.frame() around that if you need to: m < data.frame(m). or all in one line: m < data.frame(matrix(0, ncol = 30, nrow = 2)) ...

R – Count rows of a data frame which do not contain `NA` – Stack …

Replace this line: nrows < sapply( csvfiles, function(f) nrow(read.csv(f))). with this line, which uses the complete.cases function: nrows < sapply( csvfiles, function(f) nrow(complete.cases(read.csv(f)))). complete.cases takes a data frame and returns a data frame with the same columns, but with all the rows ...

R – number of rows each data frame in a list – Stack Overflow

Lists don’t have rows. Use sapply to loop over the list: sapply(data.frame.list, nrow ) …

In R, How to calculate row count of a data frame depending on …

nrow(df[df$origin == 2,]) # or slightly quicker length(df[df$origin == 2, 1]) # subset will be marginally quicker. Or as @akrun has above.

Dataframe – How to get row index number in R? – Stack Overflow

I’m interpreting your question to be about getting row numbers. You can try as. numeric(rownames(df)) if you haven’t set the rownames. Otherwise use a sequence of 1:nrow(df) . The which() function converts a TRUE/FALSE row index into row numbers.

Leave a Reply

Your email address will not be published. Required fields are marked *