If you scroll up just a little bit from
http://sourceforge.net/apps/mediawiki/pdl/index.php?title=Plotting_with_PDL::Graphics::Gnuplot#Error_bars
there is a nice example of what it sounds like you're looking for.
Derek
On Mar 11, 2013, at 2:04 PM, Chris Marshall wrote:
> Hi Craig-
>
> I've been starting to use PGG to plot some flow fields
> from image data. The images are displayed with the
> usual origin at the top left and y-index increasing down
> the screen.
>
> Unfortunately, I can't figure out how to plot the vector
> field in the same coordinates: e.g.,
>
> imag2d $img, 'my image'
> gplot( { justify=>1 }, with=>'vectors', $s->using(0,1),
> ($d)->using(0,1), { flipy=>1 } );
>
> but this doesn't seem to do the right thing. That is, if $d at
> one of the points in the image (at the corresponding $s), is
> [0,1], I would like to see a a vector arrow starting at the
> point in $s and pointing straight down 1 unit. Similarly,
> if $d at the point was [-1,0] then the vector would be
> drawn horizontal and pointing to the left.
>
> Cheers,
> Chris
>
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