title: map2 equivalent apply family
body: <p>I'd like to iterate between two vectors applying the following function to a dataframe.
  Since the dataframe is huge and  I know that the apply family functions are faster than map functions.. I was wondering if there is an alternative to map2</p>
  <pre><code>se&lt;-rbeta(iters,96,6)
  epi.a&lt;-freedom::rpert(iters, x.min=1.5, x.mode=2, x.max=3)
  p=0.2
  p2=epi.a*p
  fun_1 &lt;- function(n) map2_dbl(.x = se, .y = p2, ~ 1 - (1 - .x * .y) ^ n)
  df1 &lt;- df %&gt;% mutate(step1 = map(n, ~ fun_1(.x))) 
  </code></pre>