[R] check for data in a data.frame and return correspondent number
marianna.bolognesi at gmail.com
Wed Mar 14 18:49:13 CET 2012
still the newbie. With a question about coordinates of a vector appearing or
not in a data.frame.
I have a data.frame (MyData) with 3 columns which looks like this:
V1 V4 redNew
red-j 10.5032 appearance blood-n
red-j 9.3749 appearance ground-n
red-j 10.2167 appearance sea-n
red-j 10.8200 appearance sky-n
red-j 9.2831 area chicken-n
red-j 8.2838 area color-n
and a MyVector which includes also (but not only) the data in the 3rd
" appearance blood-n"
" appearance ground-n"
" area chicken-n"
I would like to get a data.frame of 2 columns where in the first column
there is all MyVector, and in the second column there is either the
correspondent number found in MyData (shown in column 2) or a "0" if the
entrance is not found.
I've tried some options, among which a loop:
out<-for(x in MyVector) if (x %in% MyData) print (MyData[,2])
but obviously doesn't work.
How can I select the correspondent element on column 2 for each x found in
Suggestions in general?
Thank you for consideration!!!
Have a nice day,
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