The software program has a table of values for some results, but calculates others on the fly.
On-the-fly Sentence Examples
Our coarse fisherman had yet to catch a coarse fish on the fly.
With features such as multiple payment gateways (including the most popular, PayPal) and on-the-fly shipping calculations and tax functionality, OSCommerce can save hundreds or even thousands of dollars in setup costs for entrepreneurs.
I invented a tale on the fly about writing a magazine article about some of the more humorous entries.
So using an altimeter without making errors requires constant alertness and repeated calculations, all done " on the fly " .