Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
You appear to have very neatly followed up on code presented by M-J. Dominus in The Perl Journal, Autumn 1997, Infinite lists in Perl. The article is an excellent primer on the subject. He starts from no math knowledge of streams, and builds to a brief discussion of data flow programming with lots of applications of streams (such as pseudo-random numbers, and "The Sieve of Eratosthenes," which is the oldest algorithm for computing primes).

His conclusions, and I quote:

Other Directions

The implementation of streams in Stream.pm is wasteful of space and time, because it uses an entire two-element hash to store each element of the stream, and because finding the n'th element of a stream requires following a chain of n references. A better implementation would cache all the memoized stream elements in a single array where they could be accessed conveniently. Our Most assiduous Reader might like to construct such an implementation.

A better programming interface for streams would be to tie the Stream package to a list with the tie function, so that the stream could be treated like a regular Perl array.

--- -DA

In reply to Re: infinite series by da
in thread infinite series by marvell

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others perusing the Monastery: (4)
As of 2021-09-18 17:02 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?