add an element to the beginning of an array in r

To add an element to the beginning of an array in r, you can use the c() function to concatenate the new element with the existing array. You can then use indexing to shift the elements to the right. Here's an example:

main.r
# create an array
a <- c(1, 2, 3, 4, 5)

# add a new element to the beginning
a <- c(0, a[1:length(a)])

# print the updated array
print(a)
140 chars
9 lines

This will output:

main.r
[1] 0 1 2 3 4 5
16 chars
2 lines

In this example, we create an array a with five elements, and then add a new element 0 to the beginning. We do this by concatenating 0 with a[1:length(a)], which takes all of the elements of a from index 1 to the end. We then assign the updated array back to a. Finally, we print the updated array to confirm that the new element has been added to the beginning.