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Re: How to take union or intersection of two variables?
From: |
Sam Ravnborg |
Subject: |
Re: How to take union or intersection of two variables? |
Date: |
Thu, 31 Dec 2009 00:50:20 +0100 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Thu, Dec 31, 2009 at 02:17:53PM +1800, Peng Yu wrote:
> Suppose that I have the following two variables A and B. I want to
> compute the union and the intersection of them, which are 'a b c d'
> and 'b c' respectively.
>
> A = a b c
> B = b c d
union = $(sort $(A) $(B))
intersection = $(filter $(A), $(B))
I did not test this but I think this works.
Sam