I have been spending enjoyable time with gsll's (and gsl's) histogram routines.

A small bug in the code popped up.  In histogram/histogram.lisp the grid:copy method calls histo-copy and histo-clone.  The arguments in those calls are incorrect.  This is what the method should look like:

(defmethod grid:copy ((source histogram) &key destination &allow-other-keys)
  (if destination
      (histo-copy source destination)
      (histo-clone source)))

In the original, source and destination were swapped.

The same fix applies to the method that specializes on histogram2d.

Mirko

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