I gather similarly structured data from about 30 different sources. These
data are in matrix format (15 rows by 23 columns).
To be able to analyze the data with pivot tables, I want to convert them to
a flat file format, with pr line the row label, column label, and value.

What is the easiest way to do this? ( individually referring to each cell
and it's row and column label is too error prone / tedious, as I need to be
able to change the matrix format for every new version, which is about twice
yearly, and as I have more than 1 matrix format, according to the type of
source)

--
Think, then move