Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to find the row and column position of a value as vector in an R matrix?
To find the row and column position of a value as vector in an R matrix, we can follow the below steps −
- First of all, create a matrix.
- Then, find the row and column position of a particular value using which function and reading the output with as.vector function.
Example 1
Create a matrix
Let's create a matrix as shown below −
M1<-matrix(round(rnorm(60),2),ncol=3) M1
On executing, the above script generates the below output(this output will vary on your system due to randomization) −
[,1] [,2] [,3] [1,] -0.86 -0.49 0.19 [2,] -2.42 -2.09 0.06 [3,] -2.87 0.61 0.74 [4,] -1.89 0.37 0.86 [5,] -1.05 -1.22 -0.29 [6,] 0.45 -0.42 -1.31 [7,] 1.73 1.00 -0.37 [8,] 1.61 0.02 0.81 [9,] 1.98 -0.24 -0.20 [10,] -1.55 0.56 0.14 [11,] 1.07 0.07 0.47 [12,] 0.28 0.49 -1.45 [13,] 1.29 -1.46 0.24 [14,] -1.04 -0.70 -1.51 [15,] -1.86 0.04 -0.79 [16,] 0.10 -0.74 0.47 [17,] -0.33 -0.05 -0.66 [18,] 1.74 1.31 0.90 [19,] 0.95 -0.21 0.69 [20,] 0.04 -0.62 -0.02
Find the row and column position of a value
Using which function to find the row and column position of value 0.19 −
M1<-matrix(round(rnorm(60),2),ncol=3) as.vector( which(M1==0.19,arr.ind=TRUE))
Output
[1] 1 3
Example 2
Create a matrix
Let’s create a matrix as shown below −
M2<-matrix(round(runif(60,2,5),2),ncol=3) M2
[,1] [,2] [,3] [1,] 4.27 4.03 3.52 [2,] 4.57 2.52 2.08 [3,] 3.25 3.98 4.40 [4,] 2.77 3.50 3.94 [5,] 4.53 4.64 4.39 [6,] 3.44 3.83 3.26 [7,] 3.77 2.02 3.56 [8,] 2.12 3.54 3.74 [9,] 3.73 2.19 2.22 [10,] 4.54 3.16 4.11 [11,] 3.51 2.05 3.85 [12,] 4.88 3.93 2.74 [13,] 3.38 2.82 4.77 [14,] 3.63 3.76 2.84 [15,] 3.84 3.81 4.57 [16,] 3.18 2.76 4.44 [17,] 4.19 4.73 4.20 [18,] 3.55 4.99 2.56 [19,] 4.79 3.14 2.30 [20,] 4.96 2.99 3.54
Find the row and column position of a value
Using which function to find the row and column position of value 2.05 −
M2<-matrix(round(runif(60,2,5),2),ncol=3) as.vector(which(M2==2.05,arr.ind=TRUE))
Output
[1] 11 2
Updated on: 14-Aug-2021
533 Views
Advertisements