title: Get dot-product of dataframe with vector, and return dataframe, in Pandas
body: <p>I am unable to find the entry on the method <code>dot()</code> <a href="http://pandas.pydata.org/pandas-docs/dev/api.html" rel="noreferrer">in the official documentation</a>. However the method is there and I can use it. Why is this?</p>
  
  <p>On this topic, is there a way compute an element-wise multiplication of every row in a data frame with another vector? (and obtain a <code>dataframe</code> back?), i.e. similar to <code>dot()</code> but rather than computing the dot product, one computes the element-wise product.</p>