getting a submatrix of all true

[John Hunter]

>>>>> "Bengt" == Bengt Richter <bokr at oz.net> writes:

    Bengt> Curiousness: what do your observations represent?

By day, I do research in neurology and neurobiology.  By night, stock
market analysis: academia doesn't pay!  I have written several modules
to parse the Yahoo Finance pages, eg,
http://biz.yahoo.com/z/a/x/xoma.html and
http://biz.yahoo.com/p/x/xoma.html.  The 2 fields which you identified
as missing on all but 2 observations are Revenue Estimates: "Year Ago
Sales" and "Sales Growth" for This Year, both of which are N/A for
almost all tickers.

    Jon> Interesting problem!
    Bengt> Yes. So many, so little time ... ;-/

Exactly. 

JDH