Filter Out the Cases from an Object in R Programming - filter() Function
Last Updated :
19 Jun, 2020
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filter() function in R Language is used to choose cases and filtering out the values based on the filtering expression.
Syntax: filter(x, expr) Parameters: x: Object to be filtered expr: expression as a base for filteringExample 1:
# R Program to filter cases
# Loading library
library(dplyr)
# Create a data frame with missing data
d <- data.frame( name = c("Abhi", "Bhavesh", "Chaman", "Dimri"),
age = c(7, 5, 9, 16),
ht = c(46, NA, NA, 69),
school = c("yes", "yes", "no", "no") )
d
# Finding rows with NA value
filter(d, is.na(ht))
# Finding rows with no NA value
filter(d, ! is.na(ht))
name age ht school
1 Abhi 7 46 yes
2 Bhavesh 5 NA yes
3 Chaman 9 NA no
4 Dimri 16 69 no
name age ht school
1 Bhavesh 5 NA yes
2 Chaman 9 NA no
name age ht school
1 Abhi 7 46 yes
2 Dimri 16 69 no
Example 2:
# R Program to filter cases
# Loading library
library(dplyr)
# Create a data frame
d <- data.frame( name = c("Abhi", "Bhavesh", "Chaman", "Dimri"),
age = c(7, 5, 9, 16),
ht = c(46, NA, NA, 69),
school = c("yes", "no", "yes", "no") )
d
# Finding rows with school
filter(d, school == "yes")
# Finding rows with no school
filter(d, school == "no")
name age ht school
1 Abhi 7 46 yes
2 Bhavesh 5 NA no
3 Chaman 9 NA yes
4 Dimri 16 69 no
name age ht school
1 Abhi 7 46 yes
2 Chaman 9 NA yes
name age ht school
1 Bhavesh 5 NA no
2 Dimri 16 69 no
