r - Merging two data frames with different sizes and missing values -

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i'm having problem merging 2 data frames in r.

the first 1 consists of 103731 obs of 6 variables. variable have use merge has 77111 unique values , rest nas value of 0. second 1 contains frequency of variables plus frequency of nas frame of 77112 obs 2 variables.

the resulting frame need first 1 joined frequency merging variable, df of 103731 obs frequency each value of merging variable (so duplicates if freq > 1 , each na (or 0)).

can me?

the result i'm getting contains data frame of 1 894 919 obs , used:

tot = merge(df1, df2, = "mergingvar", all= f, sort = f);

also played lot 'all=' , none of variations gave right df.

why don't take frequency table of first table?

a <- data.frame(a = c(na, na, 2,2,3,3,3)) data.frame(table(a, usena = 'ifany'))       freq 1    2    2 2    3    3 3 <na>    2

or mutate plyr

ddply(a, .(a), mutate, freq = length(a))     freq 1  2    2 2  2    2 3  3    3 4  3    3 5  3    3 6 na    2 7 na    2

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