I appreciate tilly's posting so much, that I just had to make figures from it. I modified it a bit to find the maximum offset for various array_lengths. Here are the graphs: 
Simple:
max_offset
 1600 ++----------+----------+-----------+-----------+----------+-----
+-----++
      +           +          +           +           +'/tmp/out.txt'**
+***** +
 1400 ++                                                          *   
+     ++
      |                                                           *   
+      |
      |                                                           *   
+      |
 1200 ++                                                          *   
+     ++
      |                                                           *   
+      |
 1000 ++                                                          *   
+     ++
      |                                                           *   
+      |
  800 ++                                                          *   
+     ++
      |                             ******                        *   
+      |
      |                             *     **********              *   
+      |
  600 ++                            *              ***********    *   
+     ++
      |                             *                        ******   
+      |
  400 ++             *              *                                 
+     ++
      |              ***********    *                                 
+      |
      |              *         ******                                 
+      |
  200 ++     *********                                                
+     ++
      + * ****    +  *       +           +           +          +     
+      +
    0 *****-------+----------+-----------+-----------+----------+-----
+-----++
      0          100        200         300         400        500    
+     600
                                   array_length
Better axes:
max_offset / array_length
 9 ++------+-------+-------+-------+--------+-------+-------+-------+-
+-----++
   +       +       +       +       +        +       +'/tmp/out2.txt'+*
+***** +
 8 ++   *                                                             
+     ++
   |   * *                                                            
+      |
   |   * *                                                            
+      |
 7 ++ *   *                                                           
+     ++
   | *    *                                                           
+      |
 6 +*      *                                                          
+     ++
   |*       *                                                         
+      |
 5 *+        *                                                        
+     ++
   |          *                                                       
+      |
   |           *                                                      
+      |
 4 ++          *                                                      
+     ++
   |            **                                                    
+      |
 3 ++             *        *       *       **       *       *       * 
+     ++
   |               **      **      **      ***      **      **      **
+      |
   |                 *     * *     * **    * **     ****    ****    * 
+      |
 2 ++                 *   *   **   *  ***  *   **  *   **   *  ***  * 
+     ++
   +       +       +   ** *+    ** *    ****+   ****+    ** *    **** 
+      +
 1 ++------+-------+-----**+------**------**+-----**+------**------**-
+-----++
   1       2       3       4       5        6       7       8       9 
+     10
                              log2( array_length)

[download]
That's clear: a jump at every 2**(1..$n) length of the array. The jump is to 3 times the array_length at the jump. So now we can deduct the perl source code from this {grin}.

There are small deviations due to the poor representation of lines on the ASCII field. For smaller array lengths, this relation does not hold.

Jeroen
"We are not alone"(FZ)

In reply to Re: Re (tilly) 3: alternating row colors by jeroenes
in thread alternating row colors by qball

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