title: R time series data, daily only working days
body: <p>I am using the following code:</p>
  
  <pre><code>dates&lt;-seq(as.Date("1991/1/4"),as.Date("2010/3/1"),"days")
  </code></pre>
  
  <p>However, I would like to only have working days, how can it be done?
  (Assuming that 1991/1/4 is a Monday, I would like to exclude: 1991/6/4 and 1991/7/4.
  And that for each week.)</p>
  
  <p>Thank you for your help.</p>