What is a function?
A function defines a discrete action, and most functions take a number of arguments as input. Some functions produce an output as a value in the cell that contains the formula, whilst others redirect the output to another cell, and some do not produce a useful output at all.
The Developer ShapeSheet Reference in the Visio SDK contains a description of each of the 197 functions available in Visio 2010, and there are some more that are reserved for use by Visio itself.
Formulae can be entered into any cell, but some cells will be updated by the Visio engine or by specific add-ons, thus overwriting any formula that may be within the cell. Formulae are entered starting with the = (equals) sign, just as in Excel cells, so that Visio ...
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