title: Create binary column (0/1) based on condition in another column
body: <p>I have a column of data in a data frame</p>
  
  <pre><code>Ozone   Solar.R Wind    Temp    Month   Day
  41  190 7.4 67  5   1
  36  118 8   72  5   2
  12  149 12.6    74  5   3
  18  313 11.5    62  5   4
  NA  NA  14.3    56  5   5
  28  NA  14.9    66  5   6
  23  299 8.6 65  5   7
  19  99  13.8    59  5   8
  8   19  20.1    61  5   9
  NA  194 8.6 69  5   10
  7   NA  6.9 74  5   11
  16  256 9.7 69  5   12
  11  290 9.2 66  5   13
  14  274 10.9    68  5   14
  18  65  13.2    58  5   15
  </code></pre>
  
  <p>I need to Change the Temp column to 1 or 0 based on a condition if it is greater than 70. So I need a column with 1 when the Temp is greater than 70 and 0 when it is less so I can do a regression using the Temp as a binary variable.</p>
  
  <p>R will take the condition statement </p>
  
  <pre><code>cfv &lt;- mydata$Temp
  x &lt;- cfv &gt; 70 
  for(i in nrow(cfv)) {if(x = TRUE) {1} else if(x = FALSE) {0}
  </code></pre>
  
  <p>but I can't get any further and use it to create a new column.</p>