Matrix consisting of sub-elements of another matrix

Say I have the following matrix:

x = [ 1 2 3 4 5 6 7 8 9]

If I want a matrix that consists of the following:

y = [1 2 4 5 9]

How would I go about doing this?

Answer 1

[Matt J]

By indexing,e.g.,

>> x = [ 1 2 3 4 5 6 7 8 9]*10;

>> y=x([1,2,4,5,9])

y =

    10    20    40    50    90

[Articat]

But say this matrix is much larger....137 columns. Is there a way this can be automated rather than writing in each column individually?

Sorry, I should have been more specific.

[Matt J]

There are lots of indexing techniques described at the link I gave you. For example, you can get every 3rd element with this syntax,

x=rand(1,137);

y=x(1:3:end);

You can also get all elements satisfying some condition with logical indexing, e.g.,

y=x(x>0.5);

[Articat]

Checked out the link, was very helpful! thanks for your time