Persnickety comment about visad tutorial

• To: visad-list@xxxxxxxxxxxxx
• Subject: Persnickety comment about visad tutorial
• From: Kevin Fitch <kfitch@xxxxxxxxxxx>
• Date: Tue, 14 Mar 2000 00:29:25 -0500

I just have one little comment about the visad tutorial, which overall
is very clear and useful. In Section 3.1 "Using a Integer2DSet" it is
stated that:
<quote>
We assume we have some NROWS x NCOLS pixel values. The important thing
to observe is that the pixel samples are in raster order, with component
values for the first
dimension changing fastest than those for the second dimension. 

That is, suppose we have an array of 6 values per row times 5 per
column, like 

       pixel_vals = {{0, 6, 12, 18, 24},
                     {1, 7, 12, 19, 25}, 
                     {2, 8, 14, 20, 26},
                     {3, 9, 15, 21, 27},
                     {4, 10, 16, 22, 28},
                     {5, 11, 17, 23, 29}  };

then these values should be ordered as the values indicate. 
</quote>

This is obviously a contradiction. The example shown is in column
major(FORTRAN) order, while _raster_ order is row major(C/C++, Java,
PERL, ...) order by definition. 

Kevin Fitch
UMCP Dept of Meteorology WebMaster

ps 
if im not being annoying enough :) shouldn't the section title be "Using
an Integer2Set" ?

• Follow-Ups:
  • Re: Persnickety comment about visad tutorial
    • From: Bill Hibbard

• References:
  • VisAD Tutorial now available
    • From: Bill Hibbard