Using 'rvest' to extract links : <p>I am trying to scrap data from Yelp. One step is to extract links from each restaurant. For example, I search restaurants in NYC and get some results. Then I want to extract the links of all the 10 restaurants Yelp recommends on page 1. Here is what I have tried:</p>

<pre><code>library(rvest)     
page=read_html("http://www.yelp.com/search?find_loc=New+York,+NY,+USA")
page %&gt;% html_nodes(".biz-name span") %&gt;% html_attr('href')
</code></pre>

<p>But the code always returns 'NA'. Can anyone help me with that? Thanks!</p>
