How to 'reference cells' in Report Table?

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What would be the suggested method for performing arithmetic on two values that are in different rows and, perhaps, columns of a table in the Reporting Module?

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Peruse https://docs.inductiveautomation.com/display/DOC79/Keychain+Expressions, followed by http://www.reportmill.com/support/keychains.pdf
Such things are technically possible, but not a lot of fun to implement.

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The script data source can also be useful for doing math on another data source: https://docs.inductiveautomation.com/display/DOC79/Scripting+Data+Source

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