How to subtracts elements in a list

I have list like;

A = [x1,x2,x3,x4];

i want a list which can subtract first element with all other element and so on.\

i need results like [x1-x2,x1-x3,x1-x4,x2-x3,x2-x4,x3-x4]

Any help would be appreciable.

Thanks in advance

Answer 1

[Star Strider]

To get a vector output:

A = randi(9, 1, 4)                                      % Create Vector
Dif = A(:) - A(:)';                                     % R2016b & Since
Dif = bsxfun(@minus, A(:), A(:)');                      % R2016a & Previous
Out = (triu(Dif)+tril(nan(size(Dif))))';
Out = Out(~isnan(Out))'

so for example:

A =
     8     9     7     2

Out =
    -1     1     6     2     7     5

EDIT — Corrected comments. Code unchanged.

[the cyclist]

I think the comments regarding version number are swapped here, right? It's newer versions that don't require bsxfun.

[Star Strider]

Yes. I switched the comments without realising it.

[the cyclist]

You can switch them back, and we can delete these comments. No one will ever know. ;-)

[Rishi Kiran Shankar]

Hi Star Strider. Thanks a lot!

[Star Strider]

As always, my pleasure!

Answer 2

[Matt J]

A(:)-A(:).'