Filter Using Multiple Conditions in R, Using the dplyr package, you can filter data frames by several conditions using the following syntax.
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Method 1: Using OR, filter by many conditions.
library(dplyr) df %>% filter(col1 == 'A' | col2 > 50)
Method 2: Filter by Multiple Conditions Using AND
library(dplyr) df %>% filter(col1 == 'A' & col2 > 80)
With the following data frame in R, the following example explains how to apply these methods in practice.
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Let’s create a data frame
df <- data.frame(team=c('P1', 'P2', 'P3', 'P4', 'P5', 'P6', 'P7', 'P8'),
points=c(110, 120, 80, 16, 105, 185, 112, 112),
assists=c(133, 128, 131, 139, 134,55,66,135),
rebounds=c(18, 18, 14, 13, 12, 15, 17, 12))
Now we can view the data frame
df
team points assists rebounds 1 P1 110 133 18 2 P2 120 128 18 3 P3 80 131 14 4 P4 16 139 13 5 P5 105 134 12 6 P6 185 55 15 7 P7 112 66 17 8 P8 112 135 12
Method 1: Multiple Conditions Filter Using the OR
The code below demonstrates how to use the or (|) operator to filter the data frame by rows that satisfy one or more conditions.
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library(dplyr)
Find rows where the team is equivalent to ‘P1’ or the points total exceeds 90.
df %>% filter(team == 'P1' | points > 90)
team points assists rebounds 1 P1 110 133 18 2 P2 120 128 18 3 P5 105 134 12 4 P6 185 55 15 5 P7 112 66 17 6 P8 112 135 12
The only rows that are returned are those in which the team is equal to ‘P1’ or the points total exceeds 90.
In the filter function, we can use as many “or” operators as we want.
library(dplyr)
Find rows where the team is equivalent to ‘P1’ or ‘P2’, or where the points are fewer than 90.
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df %>% filter(team == 'P1' | team == 'P2' | points < 90)
team points assists rebounds 1 P1 110 133 18 2 P2 120 128 18 3 P3 80 131 14 4 P4 16 139 13
Method 2: Filter by Multiple Conditions Using AND
The following code demonstrates how to use the and (&) operator to filter the data frame by rows that satisfy a number of criteria.
library(dplyr)
Find rows where the team is ‘P1’ and the points are larger than 90.
df %>% filter(team == 'P1' & points > 90)
team points assists rebounds 1 P1 110 133 18
Only one entry in the filter function matched both conditions.
In the filter function, we may also use as many “and” operators as we want.
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library(dplyr)
Where the team is equivalent to ‘P1’, the points are greater than 100, and the assists are less than 150.
df %>% filter(team == 'P1' & points > 100 & assists < 150)
team points assists rebounds 1 P1 110 133 18
