Apologies for the tenuous title, I went looking for a
synonym for today's subject and came up with this, anyway,
moving on ...
Have you ever created a summary column, run your template
against some data only to find it either falls over or you get that
friendly 'NaN' entry in your output frustrating isnt it? Just to
clear up one thing, 'NaN' means surprisingly enough, 'Not a
Number', if you want to know more check out the definition here.
The most common cause of the issue is...