order a dataframe according to a given list in R -



order a dataframe according to a given list in R -

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order info frame rows according target vector specifies desired order 2 answers

i have function calculate count of column in r want arrange dataframe entries according given list passed function

input appeared in form:

complete( c(2, 55, 8, 111, 12)) complete(30:25)

i have info frame in ascending order id, want arranged according list given

id nobs 2 463 8 586 12 338 55 711 111 932

should sorted / rearranged as:

id nobs 2 463 55 711 8 586 111 932 12 338

here's possible approach using merge :

# data.frame sort df <- read.csv(text= 'id,nobs 2,463 8,586 12,338 55,711 111,932') # keys utilize sorting keys <- c(2, 55, 8, 111, 12) keydf <- data.frame(key=keys,weight=1:length(keys)) merged <- merge(df,keydf,by.x='id',by.y='key',all.x=t,all.y=f) res <- merged[order(merged$weight),c('id','nobs')] > res id nobs 1 2 463 4 55 711 2 8 586 5 111 932 3 12 338

n.b.

in case data.frame id contains values not nowadays in key vector, go bottom of data.frame. in case of duplicated ids, kept adjacent after sorting.

r

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