I want to be able to scan for weekly changes in price (i.e., +2.10 or -1.50) of every stock in the market. I can get this info from Barrons each week but it takes forever.

Here are two possible interpretations. One would be to create a Daily Indicator Formula which subtracts the price from 5-days ago from the current price (this wouldn't take into account holidays but wold be based on rolling 5-trading day weeks):

C - C5

Another interpretation would be to create a Weekly Indicator Formula which subtracts the current price from the price and the end of the previous week (this would take into account holidays, but would only represent the week so far):

C - C1