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python Programming Glossary: absHow can I quantify difference between two images? http://stackoverflow.com/questions/189943/how-can-i-quantify-difference-between-two-images images. Consider using Manhattan norm the sum of the absolute values or zero norm the number of elements not equal to.. diff img1 img2 # elementwise for scipy arrays m_norm sum abs diff # Manhattan norm z_norm norm diff.ravel 0 # Zero norm return..
Evaluating a mathematical expression in a string http://stackoverflow.com/questions/2371436/evaluating-a-mathematical-expression-in-a-string self.fn sin math.sin cos math.cos tan math.tan abs abs trunc lambda a int a round round sgn lambda a abs a epsilon.. self.fn sin math.sin cos math.cos tan math.tan abs abs trunc lambda a int a round round sgn lambda a abs a epsilon.. abs abs trunc lambda a int a round round sgn lambda a abs a epsilon and cmp a 0 or 0 def evaluateStack self s op s.pop..
http://stackoverflow.com/questions/2648151/python-frequency-detection data window # Take the fft and square each value fftData abs np.fft.rfft indata 2 # find the maximum which fftData 1 .argmax..
plotting results of hierarchical clustering ontop of a matrix of data in python http://stackoverflow.com/questions/2982929/plotting-results-of-hierarchical-clustering-ontop-of-a-matrix-of-data-in-python 40 40 for i in range 40 for j in range 40 D i j abs x i x j # Compute and plot first dendrogram. fig pylab.figure..
How can you determine a point is between two other points on a line segment? http://stackoverflow.com/questions/328107/how-can-you-determine-a-point-is-between-two-other-points-on-a-line-segment a b c crossproduct c.y a.y b.x a.x c.x a.x b.y a.y if abs crossproduct epsilon return False # or 0 if using integers dotproduct..
Detect “overall average” color of the picture http://stackoverflow.com/questions/3468500/detect-overall-average-color-of-the-picture imageFile numColors granularity 5 granularity max 1 abs int granularity colors array size @getimagesize imageFile if..
Floating point equality in python http://stackoverflow.com/questions/4028889/floating-point-equality-in-python in python Something like def approx_equal a b tol return abs a b tol My use case is similar to how Google's C testing library..
Efficient way of parsing fixed width files in Python http://stackoverflow.com/questions/4914008/efficient-way-of-parsing-fixed-width-files-in-python ignored padding fields fmtstring ' '.join ' '.format abs fw 'x' if fw 0 else 's' for fw in fieldwidths fieldstruct struct.Struct.. fieldwidths cuts tuple cut for cut in accumulate abs fw for fw in fieldwidths pads tuple fw 0 for fw in fieldwidths.. optional informational function attributes parse.size sum abs fw for fw in fieldwidths parse.fmtstring ' '.join ' '.format..
what is the best way to compare floats for almost equality in python http://stackoverflow.com/questions/5595425/what-is-the-best-way-to-compare-floats-for-almost-equality-in-python
Removing Trailing Zeros in Python http://stackoverflow.com/questions/5807952/removing-trailing-zeros-in-python digits ''.join str d for d in tup.digits if delta 0 zeros abs tup.exponent len tup.digits val '0.' '0' zeros digits else val..
How to apply numpy.linalg.norm to each row of a matrix? http://stackoverflow.com/questions/7741878/how-to-apply-numpy-linalg-norm-to-each-row-of-a-matrix using the axis 1 argument to sum along rows np.sum np.abs x 2 axis 1 1. 2 Lp norms can be computed similarly of course... loops best of 3 208 us per loop In 49 timeit np.sum np.abs x 2 axis 1 1. 2 100000 loops best of 3 18.3 us per loop Other.. x 1000 loops best of 3 203 us per loop In 54 timeit np.sum abs x axis 1 100000 loops best of 3 10.9 us per loop share improve..
Algorithm to Divide a list of numbers into 2 equal sum lists http://stackoverflow.com/questions/890171/algorithm-to-divide-a-list-of-numbers-into-2-equal-sum-lists p people_left if iterations solution min map lambda i abs float i halftotalscore i oldmoves.keys return solution 1 sum.. people_left oldmoves newmoves solution min map lambda i abs float i halftotalscore i oldmoves.keys return solution 1 sum..
Detect & Record Audio in Python http://stackoverflow.com/questions/892199/detect-record-audio-in-python the volume out MAXIMUM 16384 times float MAXIMUM max abs i for i in snd_data r array 'h' for i in snd_data r.append int.. False r array 'h' for i in snd_data if not snd_started and abs i THRESHOLD snd_started True r.append i elif snd_started ..
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