computer science

If all the hub and authority scores are initialized to 1, what is the hub/authority score of a node after one iteration?

In the preceding discussion we encountered two recommended “hard constants” – the increment on te being ten times the last fetch time, and the number of back queues being three times the number of crawl threads. How are these two constants related?

How should the Boolean query x AND NOT y be handled? Why is naive evaluation
of this query normally very expensive? Write out a postings merge algorithm thatevaluates this query efficiently.

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asked by Alex
  1. You might profit from Writacher's lsson on "how to search on the internet," displayed here:

    For Internet searching:
    http://hanlib.sou.edu/searchtools/
    At this webpage, you can go immediately to the search sites (first three columns across the top) -- or even better you can scroll down until you see the section called HOW TO SEARCH THE INTERNET. Those are the links to start with. You'll not only learn how to come up with good search terms, but also how to evaluate the webpages you get as results. Some will be good and others will be garbage. You need to know how to tell the difference.

    My favorite way to search is to go to Google's advanced search page http://www.google.com/advanced_search?hl=en and put my search words or phrases into the first or second search box (either "all the words" or "exact phrase").

    Learning to use Google or other search engines can save you time and help you learn to find information efficiently. Here are some websites that can teach you how:

    http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/FindInfo.html

    http://hanlib.sou.edu/searchtools/searchtips.html

    http://www.pandia.com/goalgetter/index.html

    http://websearch.about.com/mbody.htm?once=true&COB=home&PM=112_100_T

    ... and one to help you judge whether a particular website's information is worth your time:

    http://hanlib.sou.edu/searchtools/evaluate.html

    Sra

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