how to reverse/inverse order of elements in a vector or a matrix in matlab?

Question

I have a vector

a = 1:4

I want to get

[4 3 2 1]

Which matlab function should I use?

Answer 1

If the array you want to reverse is a range a:b, then it is much faster to use:

-(-b:-a)

Answer 2

another option is to use indexing

a(end:-1:1)

Answer 3

For a row use

fliplr(a)

for column use

flipud(a)