Why would xcorr and xcorr2 be quite different here? M1 and M2 are numpy matrices. M1.shape[0] = M2.shape[0]. xcorr is what I would expect with this operation, but xcorr2 is something totally different and has imaginary numbers. xcorr does not have imaginary numbers. Answer Try giving xcorr and xcorr2 dtype=complex. According to scipy docs, the output from both fft and

# Tag: scipy

## Saving Numpy array using scipy.io.savemat MATLAB does not produce the necessary .mat file

I have written a function to convert a NumPy array into a mat file using scipy.io.savemat() but it produces a generic type of file: File with the same name but not of type .mat as expected. The array I want to save is of type <class ‘numpy.ndarray’> as verified by the print statement. I don’t know what may be the

## Installing scipy and scikit-learn on apple m1

The installation on the m1 chip for the following packages: Numpy 1.21.1, pandas 1.3.0, torch 1.9.0 and a few other ones works fine for me. They also seem to work properly while testing them. However when I try to install scipy or scikit-learn via pip this error appears: ERROR: Failed building wheel for numpy Failed to build numpy ERROR: Could

## Conformal plotting python

I’m working on the joukowsky transformation for plotting airfoils and I’m trying to do so with python. The conformal mapping should be pretty straight forward but can’t seem to find a guide on how to …

## How to use values of find_peak function Python

I have to analyse a PPG signal. I found something to find the peaks but I can’t use the values of the heights. They are stored in like a dictionary array or something and I don’t know how to extract …

## ValueError: x and y must have same first dimension, but have shapes (1, 2) and (2,)

terminal showing, ValueError: x and y must have same first dimension, but have shapes (1, 2) and (2,), how to fix this problem? from scipy.signal import argrelextrema data = np.array([-1, 0, 1, 2, 1,…

## Python – Differential equation solver for time-dependent coefficients gives different dynamics for different time offsets

I am solving the dynamics of a system when it interacts with a pulse, which basically is solving a time-dependent differential equation. In general it works fine, but whenever I take the bandwidth of …

## Cupy says it has scipy’s cg implemented, but cannot find cg(conjugate gradient method) when installed

I am unable to find this https://docs.cupy.dev/en/latest/reference/generated/cupyx.scipy.sparse.linalg.cg.html#cupyx.scipy.sparse.linalg.cg after the installation of cupy. It says module not found Can …

## How do I construct an incidence matrix from two dataframe columns using scipy.sparse.coo_matrix((data, (i, j)))?

I have a pandas DataFrame containing two columns [‘A’, ‘B’]. Each column is made up of integers. I want to construct a sparse matrix with the following properties: row index is all integers from 0 to …

## How to draw colored rectangles around grouped clusters in dendogram?

I try to add colored rectangle to dendrogram results like as follow: this is my dendrogram codes: from scipy.cluster.hierarchy import dendrogram … plt.figure(figsize=(250, 100)) labelsize=20 …