# How do I see how much data I have in R?

## How do I see how much data I have in R?

Count Number of Rows in R

- Use the data.frame(table()) Function to Count Number of Rows in R.
- Use the count() Function to Count Number of Rows in R.
- Use the ddply() Function to Count Number of Rows in R.

## What does data () do in R?

To see the list of available datasets, use data() function. All available datasets in R can be accessed by their explicit names. This function also helps to access build-in datasets from other R packages (special module-based prebuild datasets).

**How do I get a list of datasets in R?**

To get the list of available data sets in base R we can use data() but to get the list of data sets available in a package we first need to load that package then data() command shows the available data sets in that package. Also, for data sets in base R, we can use ls(“package:datasets”).

### What are the R commands?

List of R Commands & Functions

- abline – Add straight lines to plot.
- abs – Compute the absolute value of a numeric data object.
- addmargins – Put margins on tables or arrays.
- addNA – Turn NA values into a factor level.
- aggregate – Compute summary statistics of subgroups of a data set.

### What is the count function in R?

Source: R/count-tally.R. count.Rd. count() lets you quickly count the unique values of one or more variables: df %>% count(a, b) is roughly equivalent to df %>% group_by(a, b) %>% summarise(n = n()) . count() is paired with tally() , a lower-level helper that is equivalent to df %>% summarise(n = n()) .

**How do I count characters in R?**

nchar() method in R programming is used to get the length of a string.

- Syntax: nchar(string) Parameter: string. Return: Returns the length of a string.
- Syntax: str_length (str) Parameter: string as str. Return value: Length of string.
- Syntax: stri_length(str) Parameter: str as character vector.

#### What is the operator in R?

An operator is a symbol that tells the compiler to perform specific mathematical or logical manipulations. R language is rich in built-in operators and provides following types of operators.

#### What does ls () mean in R?

The ls() function in R is used to return a vector of character strings containing all the variables and functions that are defined in the current working directory in R programming. Variables whose names begin with a dot are, by default, not returned.

**What is the %>% command in R?**

%>% is called the forward pipe operator in R. It provides a mechanism for chaining commands with a new forward-pipe operator, %>%. This operator will forward a value, or the result of an expression, into the next function call/expression.

## Can you use count in R?

COUNTIF Function in R, As we know if we want to count the length of the vector we can make use of the length function. In case you want to count only the number of rows or columns that meet some criteria, Yes we can do it easily.

## How do I count all the values in a column in R?

To count occurrences between columns, simply use both names, and it provides the frequency between the values of each column. This process produces a dataset of all those comparisons that can be used for further processing.

**How do I view imported dataset in R?**

In this article, we are going to see how to Import data in R Programming Language….Read JSON Files Into R

- Install and load the rjson package in R console.
- Create a JSON file.
- Reading data from JSON file.
- Write into JSON file.
- Converting the JSON data into Dataframes.
- Working with URLs.

### How do I count the number of occurrences in a column in R?

### How do you count occurrences of a string in R?

The stringr package provides a str_count() method which is used to count the number of occurrences of a certain pattern specified as an argument to the function. The pattern may be a single character or a group of characters. Any instances matching to the expression result in the increment of the count.