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How to check if a variable contains number greater than 1 in an R data frame?
The variables in an R data frame are referred to as the columns of the data frame. Sometimes we have a threshold value for a particular column and we need to check whether all the values in that column are greater than or less than the threshold. For this purpose, we can make use of ifelse function as shown in the below examples.
Example1
Consider the below data frame −
set.seed(24) x<−rnorm(20,1,0.25) df1<−data.frame(x) df1
Output
x 1 0.8635298 2 1.1341463 3 1.1049058 4 0.8540932 5 1.2118650 6 1.0665055 7 1.1111463 8 0.8833762 9 0.7879075 10 1.0005780 11 0.6707730 12 1.1495673 13 0.8094464 14 0.6427274 15 1.0830611 16 0.8827348 17 0.9162533 18 1.3840630 19 1.1524986 20 1.1290839
Checking whether values in column x are greater than 1 or not −
ifelse(df1$x> 1,"Yes","No")
Example2
y<−rpois(20,1) df2<−data.frame(y) df2
Output
y 1 1 2 0 3 0 4 0 5 1 6 0 7 3 8 3 9 2 10 1 11 0 12 0 13 0 14 4 15 1 16 0 17 1 18 2 19 0 20 1
Checking whether values in column y are greater than 1 or not −
Example
ifelse(df2$y>1,"Yes","No")
Output
[1] "No" "No" "No" "No" "No" "No" "Yes" "Yes" "Yes" "No" "No" "No" [13] "No" "Yes" "No" "No" "No" "Yes" "No" "No"
Example3
z<−sample(0:5,20,replace=TRUE) df3<−data.frame(z) df3
Output
z 1 4 2 2 3 0 4 1 5 1 6 0 7 3 8 4 9 2 10 3 11 1 12 1 13 1 14 0 15 5 16 3 17 4 18 0 19 0 20 2
Checking whether values in column z are greater than 1 or not −
Example
ifelse(df3$z>1,"Yes","No")
Output
[1] "Yes" "Yes" "No" "No" "No" "No" "Yes" "Yes" "Yes" "Yes" "No" "No" [13] "No" "No" "Yes" "Yes" "Yes" "No" "No" "Yes"
Updated on: 05-Feb-2021
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