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

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
For the general case of an n x m matrix:
(note n & m evenly divisible by i & j respectively)
$rows = n; $cols = m; $rowstep = i; $colstep = j; $num_row_subs = $rows/$rowstep; $num_col_subs = $cols/$colstep; for $r (0 .. $num_row_subs-1) { for $c (0 .. $num_col_subs-1) { for $sub_row (0 .. $rowstep-1) { for $sub_col (0 .. $colstep-1) { $row = $r*$rowstep+$sub_row; $col = $c*$colstep+$sub_col; print "[$r*$rowstep+$sub_row = $row][$c*$colstep+$sub_ +col = $col]<br>\n"; } } } }
Switching order of for-loops changes manner of walking through sub-matrices.

In reply to Re: Iterating over Blocks of 2-Dim Array by punchcard_don
in thread Iterating over Blocks of 2-Dim Array by Kozz

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 having an uproarious good time at the Monastery: (4)
As of 2022-08-12 15:43 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?