title: add column with names in lapply function (R software)
body: <p>I am using the lapply function to estimate the quantiles of several columns of a list of data frames:</p>
  <pre><code>stack(lapply(df[3:6], quantile, prob = c(0.25,0.50,0.75), **names = c(&quot;q0.25, q0.50, q0.75&quot;)**))
  </code></pre>
  <p>It is working as I expected less the last part of names, how can I create a column in the output table that says what it is each row: q0.25, q0.50, q.075</p>