I don't know what other modules depend on PDL.
Bioperl in lucid did not depend on PDL directly
http://packages.ubuntu.com/lucid/science/bioperl
Anyway: the numbers are lower:

Package: bioperl                          107  2117    15     1
Package: bioperl-run                       11   989    21     0

Apparently, for developers there is a command: reverse-build-depends
https://wiki.ubuntu.com/UbuntuDevTools
I don't have sufficient source packages to run it on pdl.

David Mertens wrote:
Thanks! That's an astounding number, but I think it's probably an
overestimate. For example, I suspect that many of those people are
through dependencies rather than direct usage. I know that  some BioPerl
modules depend on PDL.

But, at least we know that thousands of people use PDL, whether directly
or indirectly. That's pretty cool!

David

On Mon, Jan 23, 2012 at 11:49 PM, Jan Hoogenraad
<[email protected] <mailto:[email protected]>> wrote:

    FYI: Of the 2016510 users that report their package usage from
    Ubuntu, 7332 use PDL. This is higher than other numbers I have seen
    in this mailing list.

    http://popcon.ubuntu.com/

    #The fields below are the sum for all the packages maintained by that
    #developer:
    #
    #<inst> is the number of people who installed this package;
    #<vote> is the number of people who use this package regularly;
    #<old> is the number of people who installed, but don't use this package
    #      regularly;
    #<recent> is the number of people who upgraded this package recently;
    #<no-files> is the number of people whose entry didn't contain enough
    #           information (atime and ctime were 0).
    #rank name                            inst  vote   old recent no-files


    Package: pdl                               73  7332    21     1

    Package: base-files                     182932 2016510  6389   318



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