{"action":"opened","issue":{"url":"https://api.github.com/repos/incanter/incanter/issues/298","labels_url":"https://api.github.com/repos/incanter/incanter/issues/298/labels{/name}","comments_url":"https://api.github.com/repos/incanter/incanter/issues/298/comments","events_url":"https://api.github.com/repos/incanter/incanter/issues/298/events","html_url":"https://github.com/incanter/incanter/issues/298","id":65252351,"number":298,"title":"$map method not working in Incanter 1.9.0","user":{"login":"ducky427","id":83426,"avatar_url":"https://avatars.githubusercontent.com/u/83426?v=3","gravatar_id":"","url":"https://api.github.com/users/ducky427","html_url":"https://github.com/ducky427","followers_url":"https://api.github.com/users/ducky427/followers","following_url":"https://api.github.com/users/ducky427/following{/other_user}","gists_url":"https://api.github.com/users/ducky427/gists{/gist_id}","starred_url":"https://api.github.com/users/ducky427/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ducky427/subscriptions","organizations_url":"https://api.github.com/users/ducky427/orgs","repos_url":"https://api.github.com/users/ducky427/repos","events_url":"https://api.github.com/users/ducky427/events{/privacy}","received_events_url":"https://api.github.com/users/ducky427/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-03-30T16:45:11Z","updated_at":"2015-03-30T16:45:11Z","closed_at":null,"body":"Hello,\r\nI am using the `$map` method of `incanter.core`.\r\n\r\nWhen I tried the code for the method as given in the documenation,\r\n\r\n```clojure\r\n(use '(incanter core datasets))\r\n(def cars (get-dataset :cars))\r\n\r\n($map (fn [s] (/ s)) :speed cars)\r\n```\r\n\r\nI get this error:\r\n\r\n```\r\nNullPointerException   clojure.lang.Numbers.ops (Numbers.java:961)\r\n```\r\n\r\nI tried the next example \r\n\r\n```clojure\r\n  ($map (fn [s d] (/ s d)) [:speed :dist] cars)\r\n```\r\n\r\nand again I got a NPE.\r\n\r\nAny help would be appreciated.\r\n\r\nThanks"}}