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View Code? Open in Web Editor NEWJSONiq benchmark for HEP
JSONiq benchmark for HEP
The hep:histogram
function results in offset binning if the bin range doesn't start at a multiple of the bin width. I believe this issue affects your other repositories as well.
$bucket-idx
is set to round(($v - $half-width) div $width)
. The problem is that this assumes that $half-width
is an integer multiple of $width
away from $lo
. This is equivalent to $lo
being an multiple of $width
. This is always the case if $lo
is zero but is not true generically. When this is not the case, the lowest bin gets shifted to start from the multiple of $width
that is closest to $lo
.
There are several ways to fix this, but my strategy would be to use floor(($v - $lo) div $width)
for $bucket-idx
. Then $center := $lo + $bucket-idx * $width + $half-width
. Although, it is nice to record the bin edges instead of centers (for example, numpy.histogram()
), but that's not as critical.
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