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Scheme is easy to embed and maps well to common spreadsheet operations because it accepts lists of arguments to functions like sum and stdev. It also has a full numeric stack. Modify it to accept ranges of cells and it would be an excellent language for Excel.

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http://siag.nu/siag/

that's awesome, looks like the Emacs of spreadsheets

Emacs has Org-Mode, which has auto-updating tables [1], which would be the spreadsheet of Emacs.

Here's a demo mileage tracker I did in Org-Mode [2].

- http://orgmode.org/guide/Tables.html#Tables - https://vimeo.com/71364504

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