Hi Kevin,
> I just have one little comment about the visad tutorial, which overall
> is very clear and useful.
I agree, Ugo and Tom are doing a great job, and the new sections
they're working on are going to very helpful.
> 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.
You have a point, but the tutorial is very careful not to say
either "row major" or "column major".
I think the error is where the text says "6 values per row times
5 per column" which should be "5 values per row times 6 per column".
That is,
NCOLS = number of values per row, and
NROWS = number of values per column.
> if im not being annoying enough :) shouldn't the section title be "Using
> an Integer2Set" ?
Blame the proof readers (including me) for this. I could
never get my "der", "die" und "das" right in school.
Thanks for your help,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706
hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html
