r - Contingency table with name of factors instead of counts -

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i have dataframe 3 columns. first has names of categories, second (q2) , third (q3) columns contain other factors. es:

q1 q2 q3  w  y g  x  x f  y  z

i'm using

t1 <- xtabs(~q2+q3, data=db)

to create contingency table , know how many combo categories there are.

how can obtain in itersection cells names of factors that're in column q1?

     x y z    w 0 1 0    x 1 0 0    y 0 0 1

in example, instead of 1, want a, g or f.

an option assign q1 t1 using q2 , q3 indices.

> dn <- lapply(db[2:3], levels) > t1 <- array(na, lengths(dn), dn) > t1[cbind(db$q2, db$q3)] <- levels(db$q1)[db$q1] > t1    q3 q2  x   y   z     w na  "a" na    x "g" na  na    y na  na  "f"

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