generate random data for some compound index ordering comparisons

compoundRangeIndex.js

function getRandomTime() {
   return new Date(new Date() - Math.floor(Math.random()*1000000));
}

function initialInsert() {
   // insert 1 million records
   for(var i = 0; i < 1000000; i++) {
      db.test.save({
         date_added:getRandomTime(),
         optical_lumo:Math.random()*30-10, // let's make the range 1/3 of the result
         basis: "6-31g(d)", // this isn't going to help us unless we know the cardinality of the field to model it better
         lumo:Math.random()*30-10, // let's make the range 1/3 of the result
         homo:Math.random()*30-10, // let's make the range 1/3 of the result
         sum:Math.random()*200, // *** let's make the range 1/20 of the result
         gap:Math.random()*20, //  let's make the range 1/4 of the result
         solar_product:Math.random()*100000 // about 1/3 of the result
      });
   }
}