Originally posted by sigma:
I literally use Excel all day long.

I use it to output result spreadsheets and for data input into the simulation models that I create; for all kinds of statistical interpretation of data, for all the usual math functions, and the latest major thing I did with it was using it to determine distance between two zip codes for a model I was creating. It was quite a hefty bit of code determining distance between 2 points on a sphere.



A quick google search found me lots of pre-made great circle distance equations spreadsheets, java apllets and some lat/lon to UTM to distance applets as well.

I currently work on a program that catalogs and stores very large pictures of the earths surface with VERY precise image to ground math models. The type of thing where you can figure out how many feet between a pixel.

My biggest excel task was as a reliability engineer at Xerox. I made a whole weibull analysis tool kit that fit equations to colleccted data and even generated predicted failure distributions based of FMEA data.

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