[R] Creating a symmetric contingency table from two vectors with different length of levels in R

From: suparna mitra <mitra_at_informatik.uni-tuebingen.de>
Date: Wed, 06 Apr 2011 10:39:21 +0200

How can I create a symmetric contingency table from two categorical vectors having different length of levels?
For example one vector has 98 levels

 [1] "Aconoidasida"                     "Actinobacteria (class)"

"Actinopterygii" "Alphaproteobacteria"
[5] "Amoebozoa" "Amphibia"
"Anthozoa" "Aquificae (class)"
and so on .........
98 Levels: Aconoidasida Actinobacteria (class) ....

  and the other vector has 105 levels

    [1] Flavobacteria                    Proteobacteria
Bacteroidetes/Chlorobi group     Bacteria
    [5] Epsilonproteobacteria            Epsilonproteobacteria
and so on ..........
105 Levels: Acidobacteria Aconoidasida Actinobacteria (class) ....

Now I want to create a symmetric contingency table. Any quick idea will be really helpful.
Best regards,

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