title: Getting the minimum of the rows in a data frame
body: <p>I am working with a dataframe that has 65 variables in it. The first variable catalogs a person, and the next 64 variables indicate the geographic distance that person is from each of 64 locations. Using R, I would like to create a new variable that catalogs the shortest distance for each person to one of those 64 locations. </p>
  
  <p>For example: if person X is 35, 50, 79, 100, 450...miles away from the locations, I would like the new variable to automatically assign them a 35, because this is the shortest distance. 
  Any help with this would be much appreciated. Thanks.     </p>