title: Add a column to dataframe in R, based on greater than or less than condition in previous columns
body: <p>A very basic question. I have a data frame with 14 variables and 576 observations.</p>
  
  <pre><code>&gt;  head(Boston)
       crim zn indus chas   nox    rm  age    dis rad tax ptratio  black lstat medv
  1 0.00632 18  2.31    0 0.538 6.575 65.2 4.0900   1 296    15.3 396.90  4.98 24.0
  2 0.02731  0  7.07    0 0.469 6.421 78.9 4.9671   2 242    17.8 396.90  9.14 21.6
  3 0.02729  0  7.07    0 0.469 7.185 61.1 4.9671   2 242    17.8 392.83  4.03 34.7
  4 0.03237  0  2.18    0 0.458 6.998 45.8 6.0622   3 222    18.7 394.63  2.94 33.4
  5 0.06905  0  2.18    0 0.458 7.147 54.2 6.0622   3 222    18.7 396.90  5.33 36.2
  6 0.02985  0  2.18    0 0.458 6.430 58.7 6.0622   3 222    18.7 394.12  5.21 28.7
  </code></pre>
  
  <ol>
  <li><p>I want to create a new column <code>CATMEDV</code> populated with a value of <code>1</code> or <code>0</code> for each record. If <code>medv &gt; 30.0, CATMEDV=1</code>, <code>IF medv &lt; 30, CATMEDV=0</code></p></li>
  <li><p>If I want to add multiple conditions, say <code>medv&gt;30.0</code> and <code>rm&gt;7</code> then <code>CATMEDV=1, else 0</code>. How can I do this?</p></li>
  </ol>
  
  <p>Also, everytime I paste a data frame from my R Console to a question, it gets jumbled and some moderator re-formats it. How do I paste data frames in question windows without muddling the format from R?</p>