In matlab I can do:

...

x = []

x = []

...

x(2) = 1.4

x = 0 1.4000

...

x(2,4) = 2.9

x = 0 1.4000 0 0 0 0 0 2.9000 which means x expands as necessary depending on "how far" my indexing goes. Now I'm thinking about how to realize this with numarray. I could imagine to define a derived array type "SelfInflatingArray" which catches the IndexError exception and does the right thing then. Any better ideas? -Sebastian -- Sebastian Stark -- http://www.kyb.tuebingen.mpg.de/~stark Max Planck Institute for Biological Cybernetics Spemannstr. 38, 72076 Tuebingen Phone: +49 7071 601 555 -- Fax: +49 7071 601 552