Explain with an example how to iterate a for loop over a matrix in R.

To iterate a loop over a matrix, we need to create a matrix first. Let us understand what a matrix is. A matrix is usually an array of numbers or a mathematical object defined in a rectangular shape. We can pass in different conditions to perform when we define a matrix.

In our case, we need to define a matrix to perform iteration using for loop.

mat <- matrix(1:25,nrow=5)

mat

It will create a 5x5 matrix as shown below