title: how to list a specified function in R?
body: <p>in my console:</p>
  
  <p>?nrow</p>
  
  <pre><code>Help on topic 'nrow' was found in the following packages:
  
  The number of rows/columns of an array-like object
      (in package BiocGenerics in library C:/Program Files/R/R-3.0.2/library)
  The Number of Rows/Columns of an Array
      (in package base in library C:/PROGRA~1/R/R-30~1.2/library)
  </code></pre>
  
  <p>question 1:<br>
  how can i do if i want nrow function in  package <code>BiocGenerics</code> ,that is to say :
  i want to get only one result . </p>
  
  <pre><code>The number of rows/columns of an array-like object
      (in package BiocGenerics in library C:/Program Files/R/R-3.0.2/library)  
  </code></pre>
  
  <p>question2:<br>
  there is no <code>C:/PROGRA~1/R/R-30~1.2/library</code>  in my computer,why i get it?   </p>