P Kishor wrote: > > Ok. I filed it in the sf bug tracker, but > basically it is the same info as noted above. > Nothing more. > ..
Oh, I see. I thought the problem was in PDL. It looks like it is an issue with search.cpan.org indexing and auto display for module documentation. > >> 4. Finally, my question re. using PDL::IO::GD. I > >> have a PDL constructed out of a query from a db. It > >> looks like so $a = [[$var,$x,$y],[$var,$x,$y] ..]; > >> I want to create a lookup table based on the > >> values of $var... > > > > There was a previous discussion on pdl-porters > > about making a LUT for image display. See the > > thread at > > > > http://mailman.jach.hawaii.edu/pipermail/pdl-porters/2006-December/000643.html > > Thanks for that link. It is very useful, but it is > further down the road for me. I am still at the "how > do I make an image from a collection of x,y values" > stage. So basically, you have something like a set of function values at a set of points: { $var($x($i),$y($i)) for all $i } so you need to interpolate the $var values into a dense set of pixels. I did a quick ??interp from the perldl shell and got a bunch of candidate interpolation methods. The PDL::Func stuff seemed particularly apropos for this application. When I try to solve a problem like this, I find that it helps to do a small ("paper and pencil") implementation in the perldl shell. Once I get that working, then I edit a copy of the .perldl_hist commands used to produce the desired routine. Good luck, Chris
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