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python Programming Glossary: coefficientshttp://stackoverflow.com/questions/11507028/fit-a-gaussian-function mu 2 2. sigma 2 # p0 is the initial guess for the fitting coefficients A mu and sigma above p0 1. 0. 1. coeff var_matrix curve_fit..
How does perspective transformation work in PIL? http://stackoverflow.com/questions/14177744/how-does-perspective-transformation-work-in-pil the homographic transform. By doing this you obtain your 8 coefficients and the transformation can take place. The site http xenia.media.mit.edu.. as well as many other texts describes how those coefficients can be determined. To make things easy here is a direct implementation..
Calculate camera world position with OpenCV Python http://stackoverflow.com/questions/14444433/calculate-camera-world-position-with-opencv-python this yields the camera matrix and the distortion coefficients 3 solvePnP with the world coordinates 3D and image coordinates..
Python Opencv SolvePnP yields wrong translation vector http://stackoverflow.com/questions/14515200/python-opencv-solvepnp-yields-wrong-translation-vector rms print camera matrix n camera_matrix print distortion coefficients dist_coefs.ravel cv2.destroyAllWindows np_xyz np.array xyz np.float64..
How to plot an image with non-linear y-axis with Matplotlib using imshow? http://stackoverflow.com/questions/1679126/how-to-plot-an-image-with-non-linear-y-axis-with-matplotlib-using-imshow of floats representing the discrete wavelet transform coefficients of a sound file. I am trying to plot the scalogram using those.. sound file. I am trying to plot the scalogram using those coefficients. I could copy the array x times until I get the desired image..
Decimal place issues with floats and decimal.Decimal http://stackoverflow.com/questions/286061/decimal-place-issues-with-floats-and-decimal-decimal code I use to rearrange the equations. b is a matrix of coefficients and y is the answer vector def equations b y i 0 eqn row while..
how to extract frequency associated with fft values in python http://stackoverflow.com/questions/3694918/how-to-extract-frequency-associated-with-fft-values-in-python tells you the frequencies associated with the coefficients import numpy as np x np.array 1 2 1 0 1 2 1 0 w np.fft.fft x.. freqs.min freqs.max # 0.5 0.499975 # Find the peak in the coefficients idx np.argmax np.abs w 2 freq freqs idx freq_in_hertz abs freq..
Calculating Pearson correlation and significance in Python http://stackoverflow.com/questions/3949226/calculating-pearson-correlation-and-significance-in-python dataset be normally distributed. Like other correlation coefficients this one varies between 1 and 1 with 0 implying no correlation...
Recreating time series data using FFT results without using ifft http://stackoverflow.com/questions/4451591/recreating-time-series-data-using-fft-results-without-using-ifft fft in real and imaginery parts. Then I tried to use these coefficients first 20 to recreate the data following the formula for Fourier.. mirror the one generated by ifft I use the same number of coefficients on both sides . What could be wrong Data http linuxgazette.net.. note that I am summing over the full range of frequency coefficients. When I plotted np.abs Y it looked like there were significant..
Analyze audio using Fast Fourier Transform http://stackoverflow.com/questions/604453/analyze-audio-using-fast-fourier-transform The array you are showing is the Fourier Transform coefficients of the audio signal. These coefficients can be used to get the.. Fourier Transform coefficients of the audio signal. These coefficients can be used to get the frequency content of the audio. The FFT.. FFT is defined for complex valued input functions so the coefficients you get out will be imaginary numbers even though your input..
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 2. I had an old exhaustive one based on binomial coefficients look in history . It solved the example problems of length 10..
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