In this article, we will discuss how can we transpose an array in the R programming language. The transpose of an array is obtained by changing rows to columns and columns to rows.
Aij = Aji
where i is not equal to j, thus diagonals remain unchanged.
Example:
Array demo[] ---> [1, 4, 7
2, 5, 8,
3, 6, 9]
Transpose of demo[]:
Output ---> [1, 2, 3
4, 5, 6
7, 8, 9]
There are two methods to get transpose of an array in R:
Method 1: Naive approach
We can iterate over the array and assign the correspondent elements from row to column and column to row.
Example: Transpose of an array
# Create the array Demo
Demo <- matrix(1:9, nrow = 3)
print(Demo)
# create another array Output
Output <- Demo
# Loops for array Transpose
for (i in 1:nrow(Output))
{
for (j in 1:ncol(Output))
{
Output[i, j] <- Demo[j, i]
}
}
# print the transposed array output
print(Output)
Output:
Method 2: Using t() function
We can transpose an array directly in R using the inbuilt function t(). This function takes the array as a parameter and returns its transpose.
Syntax:
t(array)
Example: Transpose of an array
# Create demo array
Demo <- matrix(1:9, nrow = 3)
print(Demo)
# using t() function transpose Demo
Output <- t(Demo)
print(Output)
Output:
