Subset dataframe based on partial string matching

Question

I have a data frame containing university names and various names of departments, centres, institutions. I would like to extract all cells containing the string "University" and save it as a vector.

I have tried grep function but as I am quite new to R I did not manage to write a correct function working across multiple columns of the data frame.

This is my example:

 V1 = c("asdad","department of x", "University of California",
   "daadasda")
  V2 = c("aadasd","Florence University", "University of Seattle", "NA")
  V3 = c ("aadasd","asdasdasd", "asdasdadads", "fsdfsdfsdf")
  V4 = c ("University of California","Department of g", "asdasd", "sdfsdfsf")

df = as.data.frame(cbind(V1,V2,V3,V4))

Expected result:

Universities: University of California, University of Seattle, Florence University, University of California

The data frame has more or less randomly scattered university names, that I would like to extract into a single vector. As I am interested also in the number of occurrences of particular universities, repeating names in the vector are desirable.

akrun · Accepted Answer · 2019-04-11 12:16:48Z

1

We can unlist the data.frame and grep for `University'

out <- data.Frame(Universities = grep("University", unlist(df), 
         ignore.case = TRIE.  value = TRUE))

answered Apr 11, 2019 at 12:16

akrun

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1 Comment

maros89 Over a year ago

This is exactly the simple solution I was struggling to find. Thank you very much!

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