You'll want to take a look at the docs for c.c.string[1], so have that open in another tab. Anyway, let's assume you have the data in a file mytext.txt
First, load the raw data with the slurp fn user=>(def raw-string (slurp "mytext.txt")) Next, you'll want to use the split-lines fn to create a sequence out of the raw-string user=>(def raw-lines (split-lines raw-string)) Now, let's consider an individual line. We'll need to do 3 things 1. Split on whitespace - for this we'll call split. Here's the anon. fn: (fn [line] (split #"\s+" line)) 2. Parse each number - for this we need Java interop. (fn [line] (map #(Integer/parseInt %) (split #"\s+" line))) 3. Wrap the result in a vector -simply call vec This looks like the following: (fn [line] (vec (map #(Integer/parseInt %) (split #"\s+" line)))) Now, we take this operation and map it over every line (map (fn [line] (vec (map #(Integer/parseInt %) (split #"\s+" line)))) raw-lines) Almost there. We need to wrap the final call with a vec as well [3]. (def parsed-vec (vec (map (fn [line] (vec (map #(Integer/parseInt %) (split #"\s+" line)))) raw-lines))) That's how I would do this forward. To do the reverse is much simpler. We'll need to use c.c.io [2] (formerly duck-streams). First, we turn the vec back into a string. This can be done easily enough with c.c.string/join (join "\n" (map #(join " " %) raw-vec)) And then we just spit this into a file: (spit "output.txt" (join "\n" (map #(join " " %) raw-vec))) And that should do it :) HTH, Sean 1. http://richhickey.github.com/clojure-contrib/string-api.html 2. http://richhickey.github.com/clojure-contrib/io-api.html 3. For those that have been here a while, my requisite point free version... (def parsed-vec (vec (map (& vec (p map #(Integer/parseInt %)) (p split #"\s+")) raw-lines))) On Apr 21, 2:40 pm, "I.K." <ignacykrasicki...@gmail.com> wrote: > Hi! > I'm learning Clojure and trying some Google Code Jam exercises. > I am more or less satisfied with the style of algorithms I write, but > I would like to know how to do input/output. I want it to be Clojure > style (terse/functional/efficient) not just rewriting the usual > loops... > Take a look at simplest example from io > standpoint:http://code.google.com/codejam/contest/dashboard?c=188266#. > I want the file: > > 3 > 2 3 > 2 3 7 > 9 10 > > turn into vector: [ [2 3] [2 3 7] [9 10] ], > > and in reverse direction (produce file given above from this vector). > > Show your style. > > Thanks, > I.K. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group > athttp://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
