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How to extract the maximum value from named vector in R?
To extract the maximum value from named vector in R, we can use which.max function.
For example, if we have a vector called X which is a named vector then we can use the following command to find the maximum value in X.
X[which.max(X)]
Check out the below examples to understand how it works.
Example 1
Following snippet creates a vector −
x1<-rpois(200,10) names(x1)<-sample(LETTERS[1:4],200,replace=TRUE) x1
The following vector is created −
D A B D C B A C A A B D D C D B B C A A A A B D C D 10 11 8 12 7 12 12 7 10 11 9 16 4 10 8 8 7 7 4 12 12 10 10 6 10 12 A C D C C C C C A D B B B A C C C A A C A C C C D D 11 9 11 13 9 8 7 4 9 18 13 9 8 6 14 8 10 11 7 11 12 12 9 13 8 7 C B A C C D C C A B A A D B D C C B C C B D C B A B 18 13 14 8 5 16 7 3 8 8 12 10 5 9 10 13 8 8 6 6 3 12 15 7 6 12 D B D A A A B A D B D D B B B B A A A A C B D D D B 14 7 7 13 14 5 10 5 4 11 12 7 7 9 7 7 7 11 11 5 10 14 5 7 8 13 D A D A A C A C A B B B A A B C D A C C D D A B A D 17 11 9 12 11 3 12 11 16 8 9 7 16 8 5 13 13 9 10 7 5 15 5 12 4 8 C D A A D D A D D B B B D B A B D B C C D D B C C D 13 4 12 7 10 9 12 13 6 6 11 13 13 8 11 8 7 9 10 7 12 11 9 12 6 10 A C B C B D D C C C C A A A B C A A A D B D A A B B 13 10 21 13 6 7 14 9 12 16 8 10 14 9 12 4 10 8 8 9 9 8 11 7 9 12 B A B A D A D C A C A D B B B D B D 11 12 13 16 9 12 4 10 9 14 10 9 12 11 11 7 9 16
To extract the maximum value from named vector in R, add the following code to the above code −
x1<-rpois(200,10) names(x1)<-sample(LETTERS[1:4],200,replace=TRUE) x1[which.max(x1)]
Output
If you execute all the above given snippets as a single program, it generates the following output −
B 21
Example 2
Following snippet creates a vector −
x2<-rpois(150,1)
names(x2)<-sample(c("India","China","UK","USA"),150,replace=TRUE)
x2The following vector is created −
USA China China India USA UK India India USA UK USA China China 0 1 2 1 0 2 1 1 3 0 2 0 1 China USA UK UK China UK India India China China India UK UK 1 2 1 1 1 0 1 2 1 1 2 0 0 China UK India China China China UK India UK USA USA China China 1 0 0 0 1 1 0 0 0 1 0 2 1 UK China USA India India UK India UK India India India India UK 1 1 0 1 1 0 0 0 1 0 0 0 3 UK UK China USA USA China India USA India UK China China USA 0 0 2 1 0 0 0 3 2 0 0 2 2 USA China China India China UK UK UK UK UK USA USA China 2 1 2 1 2 2 2 1 0 2 2 0 2 China India China USA USA USA UK China China UK USA India UK 0 0 2 1 0 1 1 0 1 1 1 1 2 India India UK USA USA UK UK China India UK India UK India 2 1 2 1 1 1 1 1 0 1 0 1 3 China China China UK India USA India USA India India USA USA UK 2 0 0 0 2 0 0 0 0 4 1 0 1 India USA UK China UK India USA USA UK UK USA India India 1 0 1 1 1 3 0 1 2 0 0 0 0 UK China China USA USA UK UK UK UK India UK USA India 1 0 1 0 0 1 0 1 2 1 1 1 1 USA USA China China India China India 2 1 5 1 1 0 0
To extract the maximum value from named vector in R, add the following code to the above code −
x2<-rpois(150,1)
names(x2)<-sample(c("India","China","UK","USA"),150,replace=TRUE)
x2[which.max(x2)]Output
If you execute all the above given snippets as a single program, it generates the following output −
China 5
Example 3
Following snippet creates a vector −
x3<-round(rnorm(100),4)
names(x3)<-sample(c("ID1","ID2","ID3","ID4"),100,replace=TRUE)
x3The following vector is created −
ID2 ID1 ID1 ID4 ID1 ID1 ID1 ID3 ID2 ID3 1.0334 1.7886 0.6770 -0.9339 -0.0034 -0.6387 -0.5268 -0.5980 -0.4164 1.6412 ID4 ID3 ID1 ID2 ID1 ID4 ID2 ID2 ID4 ID1 0.5849 -0.3585 0.3762 0.7623 -0.2129 -0.9676 -1.7943 -0.0315 0.1025 -0.6559 ID4 ID3 ID4 ID2 ID2 ID2 ID4 ID3 ID3 ID4 -0.0156 0.0006 0.1971 0.2190 -0.5205 0.3816 0.7501 -0.6530 -0.5844 -1.4492 ID1 ID4 ID1 ID1 ID2 ID4 ID4 ID1 ID3 ID4 2.3666 -0.2599 0.0630 -0.5157 0.6908 -1.4769 -0.7415 -0.6776 -0.5526 0.0715 ID1 ID2 ID3 ID1 ID2 ID4 ID4 ID3 ID3 ID3 -1.4454 0.5870 -0.9305 -0.2980 -0.0880 0.6264 0.1578 -0.8833 -2.0587 0.9624 ID2 ID2 ID3 ID3 ID4 ID4 ID1 ID2 ID4 ID4 -1.5744 -0.8778 0.8962 0.4155 1.9931 0.4885 -0.1609 1.8387 1.1193 -0.9107 ID2 ID2 ID4 ID1 ID3 ID3 ID3 ID4 ID2 ID4 0.3475 -1.8570 -0.6960 1.0803 -1.0373 -0.1382 0.6719 -1.3278 -0.2718 -0.2137 ID4 ID1 ID4 ID2 ID2 ID1 ID3 ID4 ID2 ID4 1.8999 -0.8459 0.3388 -0.1979 0.0442 -0.5485 -0.1884 -0.0564 -0.7241 -1.6733 ID 3 ID2 ID1 ID2 ID3 ID2 ID3 ID1 ID3 ID2 -2.1790 1.7054 0.2405 0.2375 -0.0618 -0.1500 -1.7940 -2.0460 -1.5794 0.6471 ID4 ID2 ID1 ID1 ID2 ID4 ID2 ID3 ID1 ID1 1.5265 0.3566 1.0487 -0.6227 -1.9454 2.6662 -0.4045 -0.6129 -0.6179 -1.2167
To extract the maximum value from named vector in R, add the following code to the above code −
x3<-round(rnorm(100),4)
names(x3)<-sample(c("ID1","ID2","ID3","ID4"),100,replace=TRUE)
x3[which.max(x3)]Output
If you execute all the above given snippets as a single program, it generates the following output −
ID4 2.6662
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