26 September, 2008

Books On Computational Geometry

Spent afternoon looking for some good books on computational geometry algorithms. Following is the compiled list. Just ordered one book from A1 books, hope to get it by next weekend.

  • Computational Geometry and Computer Graphics in C++
by Michael J. Laszlo (Author)
Publisher: Prentice Hall; Facsimile edition (October 20, 1995)

  • Computational Geometry in C
Joseph O'Rourke
Publisher: Cambridge University Press; 2000 edition (February 15, 2001)
# ISBN-10: 0521649765
# ISBN-13: 978-0521649766

  • "Comptuational Geometry: Algorithms and Applications"
Mark de Berg et al
Publisher: Springer; 3rd edition (April 16, 2008)

  • Computational Geometry (Monographs in Computer Science) (Hardcover)
by Franco P. Preparata (Author), Michael Ian Shamos (Author)
Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. K (October 1990)

23 September, 2008

Story of Internet: No. of Users

Yesterday watched TV program "Download: True Story of Internet" in Discovery channel. One of interesting statistics mentioned was number of Internet users. The sheer adoption growth rate is awesome. Today I tried to search for Internet statistics. Following is what I found:

I imported data from Wikipedia using Google spreadsheet's ImportHtml function.

(Source: http://en.wikipedia.org/wiki/List_of_countries_by_number_of_internet_users )

18 September, 2008

I felt it

Yesterday early morning, I felt it (magnitude 4.9).

Source: http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/us2008xace.php

05 September, 2008

Damaged Currency Notes

If you live in India in first decade of twenty first century, you inevitably come across currency notes which are in bad condition, torn or lots of writing on it. In general, notes (especially 10 Rupees denomination) are is bad condition.

Careless handling by people (from all walks of life) could be the is main cause. Also some bank employee and employees of other institutions which handle the large amount notes write on the notes using pen. Sometime they staple the notes. Yesterday, I actually saw Life Insurance Corporation of India (LIC) employee writing the total sum on the top note. I hope she listens to RBI's following policy guideline (issued in 2007) about handling notes.

"It has, therefore, been decided that hereinafter and with immediate effect :

a. banks should do away with stapling of any note packets and instead secure them with paper bands,

b. banks should sort notes into re-issuables and non-issuables, and issue only clean notes to public. Soiled notes in unstapled condition may be tendered at the Reserve Bank in inward remittances through Currency Chests; and,

c. banks should forthwith stop writing of any kind on watermark window of bank notes."

Source: http://rbi.org.in/scripts/BS_CircularIndexDisplay.aspx?Id=3259

Although policy is for banks, it would be nice if LIC being so big and pervasive thought out India, follows it, not out of compulsion, but to keep the notes clean and increase their life span.

As per this FAQ on RBI website, all banks should accept partially damaned notes, so if you have them just submit at your nearest bank.

BTW did you know about RBI's Project Financial Literacy. It is available in many regional languages, well done RBI.