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.

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 – 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 …

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:

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.

R – fastest way to count the number of rows in a data frame that has at …

Before I begin, note that none of the code here is mine. I was merely fascinated by the code in the comments and wondered which one really performed the best. I suspected some of the time was being absorbed in transforming a data frame to a matrix for apply and rowSums , so I’ve also done most of the …

Nrow function | R Documentation

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.

R – number of rows matching condition | Just one line it

Rnumber of rows matching condition. It is a very simple question but all the answers I found online were using packages or weird stuff. Basically, I just wanted to count the number of rows of a data frame that were matching one or several conditions. And it is indeed very simple. Assuming a data frame …

15 Easy Solutions To Your Data Frame Problems In R (article …

This means that a data frame’s rows do not need to contain, but can contain, the same type of values: they can be numeric, character, logical, etc.;. As you can see below, each instance, listed in the first unnamed column with a number, has certain characteristics that are spread out over the remaining three …