Constructing a Symmetric Matrix in R Programming (Example Code)

In this tutorial you’ll learn how to construct a symmetric matrix object in the R programming language.

Example: Create Symmetric Matrix Using upper.tri() & lower.tri() Functions

x <- matrix(letters[1:25], nrow = 5)    # Create matrix
x[upper.tri(x)] <- t(x)[upper.tri(x)]   # Add symmetric values
diag(x) <- "x"                          # Replace diagonal
x                                       # Display symmetric matrix
#      [,1] [,2] [,3] [,4] [,5]
# [1,] "x"  "b"  "c"  "d"  "e" 
# [2,] "b"  "x"  "h"  "i"  "j" 
# [3,] "c"  "h"  "x"  "n"  "o" 
# [4,] "d"  "i"  "n"  "x"  "t" 
# [5,] "e"  "j"  "o"  "t"  "x"

Related Articles

Please find some related R programming tutorials on topics such as variables and matrices in the following list.

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