32 lines
789 B
Python
32 lines
789 B
Python
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import math
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def ListHistogram(L, nbins, minmax=None, normalize=None):
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"""Compute histogram of a list.
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Does not use Numeric or numarray.
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H[i] is the number of elements from L
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such that bins[i] <= L[i] < bins[i+1]
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"""
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n = len(L)
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if minmax is None:
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xmin = min(L)
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xmax = max(L)
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else:
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xmin, xmax = minmax
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# clip data
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for i in range(n):
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if L[i] < xmin:
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L[i] = xmin
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if L[i] > xmax:
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L[i] = xmax
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bin_width = (xmax - xmin) / float(nbins - 1)
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H = [0] * nbins
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for i in range(n):
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idx = int(math.floor((L[i] - xmin) / bin_width))
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H[idx] += 1
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bins = []
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for i in range(nbins):
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bins.append(xmin + bin_width * i)
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return bins, H
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