R, Sum frequency data frame by name -


i have data.frame looks this:

      name         freq          1   species1        4               2   species2        8               3   species1        7               4   species1        10              5   species2        9

i want sum frequency each species name. expected result:

      name             freq 1    species1           21 2    species2           17

assuming attached data.frame, this

tapply(freq, index=list(name),fun=sum)

or, data frame called "datax"

tapply(datax$freq, index=list(datax$name),fun=sum)

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