I would like to modify the examples given
user=> (def csv (parse-csv "1,2,3\n4,5,6\n7,8,9"))
#'user/csv
user=> (nth (nth csv 1) 2) ;; Get 2nd row, last column.
"6"
user=> (-> csv (nth 1) (nth 2)) ;; Another way to do it.
"6"
user=> (defn get-column [parsed-csv col] (map #(nth % col)
parsed-csv)) ;; Function to return a given column.
#'user/get-column
user=> (get-column csv 1) ;; Get second column as a sequence.
("2" "5" "8")
to read in a .csv file, and then perform the functions on the parsed
csv file, but I am getting clojure.lang.LazySeq cannot be cast to
clojure.lang.IFn.
How do I do this properly?
Thanks.
On Jun 16, 12:20 am, David Santiago <david.santi...@gmail.com> wrote:
> Here's a repl session that will hopefully demonstrate how to do a few
> things, including pull out an entire column. Just remember the library
> turns CSVs into regular clojure data structures, so getting the data
> you want out of the return value of the parse is just about indexing
> into vectors.
>
> user=> (use 'clojure-csv.core)
> nil
> user=> (def csv (parse-csv "1,2,3\n4,5,6\n7,8,9"))
> #'user/csv
> user=> (nth (nth csv 1) 2) ;; Get 2nd row, last column.
> "6"
> user=> (-> csv (nth 1) (nth 2)) ;; Another way to do it.
> "6"
> user=> (defn get-column [parsed-csv col] (map #(nth % col)
> parsed-csv)) ;; Function to return a given column.
> #'user/get-column
> user=> (get-column csv 1) ;; Get second column as a sequence.
> ("2" "5" "8")
>
> - David
>
> On Wed, Jun 15, 2011 at 9:58 PM, octopusgrabbus
>
>
>
>
>
>
>
> <octopusgrab...@gmail.com> wrote:
> > I've got to go back and look at your documentation. I'm not sure how
> > to pull the columns out of each row.
>
> > On Jun 15, 5:04 pm, David Santiago <david.santi...@gmail.com> wrote:
> >> I'm afraid I don't understand the question. What do you mean
> >> "positionally?" When it parses the CSV file, it gives you back a
> >> stream of rows, each row being a vector of the contents of each cell
> >> of the CSV. If you are interested in cells at a given row/column, you
> >> should be able to count into those vectors fairly naturally...
>
> >> - David
>
> >> On Wed, Jun 15, 2011 at 2:08 PM, octopusgrabbus<octopusgrab...@gmail.com>
> >> wrote:
> >> > Is it possible to use clojure-csv to extract data positionally in
> >> > a .csv file, or should I use BufferedReader to read each line lazily
> >> > and apply splitting the line up into fields by delimiter?
>
> >> > Thanks.
> >> > cmn
>
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