15 lines
607 B
Common Lisp
15 lines
607 B
Common Lisp
(defun mode (sequence &rest hash-table-options)
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(let ((frequencies (apply #'make-hash-table hash-table-options)))
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(map nil (lambda (element)
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(incf (gethash element frequencies 0)))
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sequence)
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(let ((modes '())
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(hifreq 0 ))
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(maphash (lambda (element frequency)
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(cond ((> frequency hifreq)
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(setf hifreq frequency
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modes (list element)))
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((= frequency hifreq)
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(push element modes))))
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frequencies)
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(values modes hifreq))))
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