Warren Weckesser questions

Warren Weckesser answers

• SciPy step response plot seems to break for some values
• Instantiate a matrix with x zeros and the rest ones
• finding the real eigenvectors of a real symmetric matrix in numpy or scipy
• How to interface a NumPy complex array with C function using ctypes?
• find Markov steady state with left eigenvalues (using numpy or scipy)
• Chi-squared goodness of fit test in Python: way too low p-values, but the fitting function is correct
• Savitzky-Golay filtering giving incorrect derivative in 1D
• Using FFT to find the center of mass under periodic boundary conditions
• scipy.ndimage.filters.convolve and multiplying Fourier Transforms give different results
• Wolfram Alpha and scipy.integrate.quad give me different answers for the same integral