Please HELP: need routine to export coordinates of UCS to text file

[Alberto]

Hi everybody, I'm a novice user of AUTOCAD and I'm starting learning about
AUTOLISP and Autocad customization...I need to export the transformation
matrixes (a.k.a. the coordinates: origin and orientation) of some UCS to a
text file to elaborate them with MATLAB...does anybody know how to retrieve,
format and export those informations?

Any help will be very appreciated

Thanks a lot

Alberto (preparing his mechanical engineering final thesis)