Let's assume I have a table (generated from DB) with 3 columns with daily
receipts from three shops. Fourth column is a sum of all three values (sum
is calculated by SQL query). Now, I would like to add next column showing
the difference between the sum of current day, and the value from previous
day. I tried using tal:define in various ways, but I either get the message
that some variable is redefined twice, or some variable definition is
missing. From my tests it seems that I cannot accomplish this task with
tal:define. If I could do something like tal:php :-) it would be perfect.
The whole idea is rather simple, but I don't know how to store previous
value from one row iteration to another. Any ideas?

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