How to loop through a Matrix using a "for" loop in R
Overview
To understand how to use for loops in R, click on this shot. To understand a matrix and learn about its creation in R, you can refer to this.
Looping through a matrix
We can loop through a matrix using a for loop in R. The loop starts at the first row of the given matrix and proceeds towards the right.
Code
# creating a matrixmymatrix <- matrix(c("mango", "banana", "lemon", "orange"), nrow = 2, ncol = 2)# using a for loopfor (rows in 1:nrow(mymatrix)) {for (columns in 1:ncol(mymatrix)) {print(mymatrix[rows, columns])}}
Explanation
- Line 2: We create a
2by2matrix calledmymatrix. - Line 5: We use a
forloop and refer to all the elements present in each row ofmymatrix. - Line 6: We now use the
forloop and refer to all the elements present in eachmymatrixcolumn. - Line 7: We print all the matrix elements.
Code
# creating a matrix 2D matrixmymatrix <- array(c("mango", "banana", "lemon", "orange"), dim=c(2, 2))# getting the dimensions of the matrixdimensions = dim(mymatrix)# using a for loopfor (rows in 1:dimensions[1]) {for (columns in 1:dimensions[2]) {print(mymatrix[rows, columns])}}
Explanation
- Line 2: We create a
2by2matrixmymatrixhaving2rows and2columns using thearray()function. - Line 5: We use
dim()to get the dimensions ofmymatrix. - Line 8: We use a
forloop and refer to all the elements present in each row ofmymatrix. - Line 9: We now use the
forloop and refer to all the elements present in eachmymatrixcolumn. - Line 10: We print all the matrix elements.
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