Recent questions tagged NumPy

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numpy - Not plotting 'zero' in matplotlib or change zero to None [Python]

I have the code below and I would like to convert all zero's in the data to None's (as I do not ... not plot the zero values in Matplotlib. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Python 3D Plots over non-rectangular domain

I have some z=f(x,y) data which i would like to plot. The issue is that (x,y) are not part of a "nice" ... my x-and y-values are 1d. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Converting image from RGB to HSV color space

I couldn't find such function (i.e. RGB_to_HSV()) in Scipy or Matplotlib's documentations, and Google doesn' ... Should I delete this question? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Python 4D linear interpolation on a rectangular grid

I need to interpolate temperature data linearly in 4 dimensions (latitude, longitude, altitude and time). The number ... much for your help! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - How can I draw scatter trend line on matplot? Python-Pandas

I want to draw a scatter trend line on matplot. How can I do that? Python import pandas as pd import ... time is integer value. Scatter chart See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Smooth spline representation of an arbitrary contour, f(length) --> x,y

Suppose I have a set of x,y coordinates that mark points along contour. Is there a way that I can build ... ) interp_x,interp_y = spl(interp_d) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy with python: convert 3d array to 2d

Say that I have a color image, and naturally this will be represented by a 3-dimensional array in python, say ... not desirable for me. Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - What does a colon and comma stand in a python list?

I met this in a python script list[:, 1] and I am trying to figure out the role of the comma. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Estimate Autocorrelation using Python

I would like to perform Autocorrelation on the signal shown below. The time between two consecutive points is 2. ... 'autocorrelation') P.show() See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Why does it take ages to install Pandas on Alpine Linux

I've noticed that installing Pandas and Numpy (it's dependency) in a Docker container using the base OS Alpine vs. ... 0% cpu 16:08.47 total See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - How can I take the square root of -1 using python?

When I take the square root of -1 it gives me an error: invalid value encountered in sqrt How do I fix that? ... arr=sqrt(-1) print(arr) OUTPUT See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Compute divergence of vector field using python

Is there a function that could be used for calculation of the divergence of the vectorial field? (in matlab) ... ) Does anyone have suggestions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Using gcloud ml serving for large images

I have a trained net in tensorflow that i wish to use in gcloud ml-engine serving for prediction. Predict gcloud ... but none of them worked... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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958 views

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numpy - polynomial regression using python

From what I understand polynomial regression is a specific type of regression analysis, which is more complicated than ... a non-linear line? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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732 views

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numpy - How to convert a column or row matrix to a diagonal matrix in Python?

I have a row vector A, A = [a1 a2 a3 ..... an] and I would like to create a diagonal matrix, B = diag(a1, a2, a3, . ... 0] [0 0 3 0] [0 0 0 4]] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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944 views

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numpy - Pixel neighbors in 2d array (image) using Python

I have a numpy array like this: x = np.array([[1,2,3],[4,5,6],[7,8,9]]) I need to create a ... [1]]) return neighbours How can I improve this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - sparse 3d matrix/array in Python?

In scipy, we can construct a sparse matrix using scipy.sparse.lil_matrix() etc. But the matrix is in 2d. ... 's no existing data structure? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Fitting to Poisson histogram

I am trying to fit a curve over the histogram of a Poisson distribution that looks like this I have modified the ... histo(30)) plt.plot(popt) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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739 views

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numpy - Fastest way to compute entropy in Python

In my project I need to compute the entropy of 0-1 vectors many times. Here's my code: def entropy(labels) ... n_classes) Is there a faster way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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551 views

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numpy - Principal component analysis in Python

I'd like to use principal component analysis (PCA) for dimensionality reduction. Does numpy or scipy already have it, ... I don't know about. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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612 views

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numpy - How to count RGB or HSV channel combination in an image?

I use python opencv load an image which has shape (30, 100, 3), now want to count the frequency for ... one element and count its frequency? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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682 views

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numpy - Improving FFT performance in Python

What is the fastest FFT implementation in Python? It seems numpy.fft and scipy.fftpack both are based on ... using distributed (MPI) FFT? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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589 views

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numpy - Show confidence limits and prediction limits in scatter plot

I have two arrays of data as hight and weight: import numpy as np, matplotlib.pyplot as plt heights = ... =screenshot6 Any ideas is appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Generating movie from python without saving individual frames to files

I would like to create an h264 or divx movie from frames that I generate in a python script in matplotlib ... .ffmpeg.org/ffmpeg-doc.html#SEC41 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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865 views

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numpy - Python/Scipy 2D Interpolation (Non-uniform Data)

This is a follow-up question to my previous post: Python/Scipy Interpolation (map_coordinates) Let's say I want to ... ',s=5) plt.show() See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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730 views

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numpy - Vectorized way of calculating row-wise dot product two matrices with Scipy

I want to calculate the row-wise dot product of two matrices of the same dimension as fast as possible. This is the ... output is: [ 26. 14.] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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numpy - Python RuntimeWarning: overflow encountered in long scalars

I am new to programming. In my latest Python 2.7 project I encountered the following: RuntimeWarning: ... : SomeList.append(VeryLongFormula) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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648 views

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numpy - how to read certain columns from Excel using Pandas - Python

I am reading from an Excel sheet and I want to read certain columns: column 0 because it is the row-index, and ... which is the length of s. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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