python Programming Glossary: quadratic

Animate quadratic grid changes (matshow)

http://stackoverflow.com/questions/10429556/animate-quadratic-grid-changes-matshow

quadratic grid changes matshow I have a NxN grid with some values which..

http://stackoverflow.com/questions/12581437/python-random-sample-with-a-generator

becomes large because using list.insert in a loop may have quadratic complexity. Here's an alternative that in my opinion preserves..

What is the equivalent of CPython string concatenation, in C++? [duplicate]

http://stackoverflow.com/questions/13021985/what-is-the-equivalent-of-cpython-string-concatenation-in-c

unlike C &rsquo s mutable std basic_string strings. The quadratic to linear time optimization in CPython. CPython 2.4 added the.. optimization reduces a sequence of concatenations from quadratic time O n 2 to linear time O n in the length n of the final result... about performance for linear time is quite different from quadratic time How is linear time achieved Well with the update the same..

Peak-finding algorithm for Python/SciPy

http://stackoverflow.com/questions/1713335/peak-finding-algorithm-for-python-scipy

peak not just the index with maximum value probably using quadratic interpolation or something. Typically you only care about a..

Making a Python script Object-Oriented

http://stackoverflow.com/questions/1813117/making-a-python-script-object-oriented

the normal way of expressing this while it currently takes quadratic time O N squared . Then correctness the two statements right..

Time complexity of accessing a Python dict

http://stackoverflow.com/questions/1963507/time-complexity-of-accessing-a-python-dict

run time grows exponentially even though the algorithm is quadratic. I use a dictionary to memoize values. That seems to be a bottleneck...

Python: removing duplicates from a list of lists

http://stackoverflow.com/questions/2213923/python-removing-duplicates-from-a-list-of-lists

elem in k if elem not in new_k new_k.append elem loop in quadratic method fastest of all for short lists. For long lists it's faster.. loops best of 3 4.44 usec per loop confirming that the quadratic approach has small enough constants to make it attractive for.. i in range 12 ' 10000 loops best of 3 25 usec per loop the quadratic approach isn't bad but the sort and groupby ones are better...

Python frequency detection

http://stackoverflow.com/questions/2648151/python-frequency-detection

values found the bin that had the highest value and used a quadratic interpolation around the peak using the log of the max value.. neighboring values to find the fundamental frequency. The quadratic interpolation I took from some paper that I found. It works.. 2 # find the maximum which fftData 1 .argmax 1 # use quadratic interpolation around the max if which len fftData 1 y0 y1 y2..

Good way to append to a string

http://stackoverflow.com/questions/4435169/good-way-to-append-to-a-string

10 loops best of 3 12.8 sec per loop ouch even worse than quadratic. So pypy is doing something that works well with short strings..

Scipy interpolation how to resize/resample 3x3 matrix to 5x5?

http://stackoverflow.com/questions/5586719/scipy-interpolation-how-to-resize-resample-3x3-matrix-to-5x5

for a kx and ky of 3 default . Lower it to 2 and get a quadratic fit instead of cubic. import numpy scipy from scipy import interpolate..

Generating unique, ordered Pythagorean triplets

http://stackoverflow.com/questions/575117/generating-unique-ordered-pythagorean-triplets

Not only is it over 100 times faster for N of 1000 it is quadratic on N so the speedup increases as N grows. I've encountered this..

Choosing between different switch-case replacements in Python - dictionary or if-elif-else?

http://stackoverflow.com/questions/594442/choosing-between-different-switch-case-replacements-in-python-dictionary-or-if

0.0 0.0 0.0 expansionFactor 1 centerPos 0.0 0.0 elif curve quadratic self.currentCurve QuadraticCurve lineColor 0.0 0.0 0.0 This..

How do I calculate r-squared using Python and Numpy?

http://stackoverflow.com/questions/893657/how-do-i-calculate-r-squared-using-python-and-numpy

and the degree of the polynomial I want to fit linear quadratic etc. . This much works but I also want to calculate r coefficient..