Thread Subject: Inverse of an array

I need to make a function that inverses an array by using a loop
so the function will for example inverse [1 2 3 4] into [4 3 2 1])
What's the easiest way to make this one?

On Nov 23, 1:07 pm, "Frank " <frankie_1_9_...@hotmail.com> wrote:
> I need to make a function that inverses an array by using a loop
> so the function will for example inverse [1 2 3 4] into [4 3 2 1])
> What's the easiest way to make this one?

Here's a very simple loop.
A = [1 2 3 4];
for i=1
B = fliplr(A);
end
%%%%%%
B =
     4 3 2 1

A real example:

A = [1 2 3 4];
for i=1:length(A)
B(i) = A(length(A)-i+1)
end

or just a vectorized version (without using fliplr)
B = A(length(A)-A+1)

-Nathan

The simplest "non-loop" version is this:

A = A(end:-1:1)

It's a neat trick that inside the (), MATLAB knows that the "end"
keyword means "length of the vector."

By the way, I'd call it "reverse" the vector, or "flip" it since, you
should recall, "inverse" has quite another meaning.