r - Subsetting a list of data frame with multiple criteria -

i have large dateset multiple data forest inventory. data frame contains species found in each plot. , data organized site.

> str(mm,max.level=2)   list of 50         $ :'data.frame':   2944 obs. of  18 variables:         ..$ plot     : int [1:2944] 2 3 3 3 3 4 4 4 5 5 ...       ..$ cla      : factor w/ 2 levels "a","n": 1 1 1 1 1 1 1 1 1 1 ...       ..$ subclase : factor w/ 7 levels "1","3c","3e",..: 5 2 3 2 3 2 3 3 1 1 ...       ..$ posesp   : int [1:2944] 1 1 1 2 2 1 1 2 1 2 ...       ..$ especie  : int [1:2944] 28 72 72 41 44 28 43 28 28 43 ...       ..$ ocupa    : int [1:2944] 10 6 7 3 2 9 5 4 5 5 ...       ..$ estado   : int [1:2944] 3 4 4 4 4 4 2 2 1 2 ...       ..$ fpmasa   : int [1:2944] 1 4 4 4 4 2 4 2 1 4 ...       ..$ edad     : int [1:2944] 14 na na na na 35 na 5 2 na ...       ..$ finfor   : int [1:2944] 8 na na na na 7 na 5 1 na ...       ..$ fiabil   : int [1:2944] 4 na na na na 4 na 3 4 na ...       ..$ barrena1 : logi [1:2944] na na na na na na ...       ..$ barrena2 : logi [1:2944] na na na na na na ...       ..$ barrena3 : logi [1:2944] na na na na na na ...       ..$ altper   : logi [1:2944] na na na na na na ...       ..$ orgmasa1 : int [1:2944] 2 1 1 1 1 2 1 1 1 1 ...       ..$ orgmasa2 : int [1:2944] 2 4 4 4 4 2 4 1 1 4 ...       ..$ tratmasa : int [1:2944] 1 2 2 2 2 1 2 1 1 2 ...      $ :'data.frame':   3685 obs. of  18 variables:       ..$ plot     : int [1:3685] 25 25 26 26 26 27 28 29 29 29 ...       ..$ cla      : factor w/ 3 levels "a","n","r": 1 1 1 1 1 1 1 1 1 1 ...       ..$ subclase : factor w/ 8 levels "1","2","3c","3e",..: 1 1 5 5 5 1 6 3 4 3 ...       ..$ posesp   : int [1:3685] 1 2 1 2 3 1 1 1 1 2 ...       ..$ especie  : int [1:3685] 24 237 24 237 68 24 24 24 24 237 ... ..$ ocupa    : int [1:3685] 8 1 6 2 2 9 10 9 9 1 ...   ..$ estado   : int [1:3685] 4 2 3 2 2 4 3 4 4 2 ...   ..$ fpmasa   : int [1:3685] 4 4 4 4 4 3 2 4 4 4 ...   ..$ edad     : int [1:3685] na na na na na na 25 na na na ...   ..$ finfor   : int [1:3685] na na na na na na 5 na na na ...   ..$ fiabil   : int [1:3685] na na na na na na 3 na na na ...   ..$ barrena1 : logi [1:3685] na na na na na na ...   ..$ barrena2 : logi [1:3685] na na na na na na ...   ..$ barrena3 : logi [1:3685] na na na na na na ...   ..$ altper   : logi [1:3685] na na na na na na ...   ..$ orgmasa1 : int [1:3685] 1 1 1 1 1 1 2 1 1 1 ...   ..$ orgmasa2 : int [1:3685] 1 1 1 1 1 1 2 1 1 1 ...   ..$ tratmasa : int [1:3685] 1 1 1 1 1 1 1 1 1 1 ...  > names(mm[[9]])  [1] "plot" "cla"       "subclase"  "posesp"    "especie"    [6] "ocupa"     "estado"    "fpmasa"    "edad"      "finfor"    [11] "fiabil"    "barrena1"  "barrena2"  "barrena3"  "altper"    [16] "orgmasa1"  "orgmasa2"  "tratmasa"  

i need subset data set every plot multiple criteria in especies(==24 & ==28). trying

<-llply(mm, subset, especie==24) 

buy, worked 1 species

does know how can this? in advance

it difficult work str(mm).

no libraries needed. try like:

 # input: df - output: subset plot , other criteria  f <- function(x){        x.splitted <- split(x, x$plot)        lapply(x.splitted, function(y) y[y$especie == 24 &                                         y$especie == 28,]) }  #  mm.subset <- lapply(mm, f) 

optionally may have data consolidated in single data.frame

# in case prefer data.frame instead of list of data.frames do.call(rbind, mm.subset)