Dear Monks,

Is there a PDL-threaded way to create a piddle of medians of portions of another piddle? Like this, but with an arbitrary "step" in the where statements:

pdl> $b = pdl (0,1,2,3,4,5,6,7,8,9,10,10.5,11,11.5,12,12.5,13,13.5,14,
+14.5)

pdl> p $b
[0 1 2 3 4 5 6 7 8 9 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5]
pdl> $a = pdl (0,6,18,7,19,3,10,2,12,4,8,9,1,15,11,11,19,17,0,9)

pdl> p $a
[0 6 18 7 19 3 10 2 12 4 8 9 1 15 11 11 19 17 0 9]

pdl> $d = pdl($a(($b>0)*($b<=5);?)->medover, $a(($b>5)*($b<=10);?)->me
+dover, $a(($b>10)*($b<=15);?)->medover)

pdl> p $d
[7 8 11]

[download]
Where instead of a huge number of $a(($b>n*x)*($b<=(n+1)*x);?)->medover statements, I could just specify the "x" to use? What I'm attempting to accomplish is a sort of "chunky" fit of data, condensing a large number of points into a series of non-overlapping representative medians.

Thanks for your help!

In reply to Grouping one piddle based on ranges of another by astroman

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