I ran into this when experimenting with the giza PGPLOT substitution.
giza's implementation of pgctab() fails unless each successive ramp
value is greater than the previous. But,
$ perl -MPDL -MPDL::Graphics::LUT -le 'my ($r) = rfits
"$PDL::Graphics::LUT::rampdir/ramp.fits"; print $r->slice("150:154");'
[0.58824 0.59608 0.6 0.59608 0.60392]
Is this a mistake of some sort, or is there a reason it is non-increasing?
Thanks,
Pete
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