Recent questions tagged Numpy

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numpy - passing c++ double pointer to python

I could pass one-dimension array to python like below. and I wonder if I can pass c++ double pointer array to ... print 'outdata: %s' % outdata See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - How to calculate the 99% confidence interval for the slope in a linear regression model in python?

We have following linear regression: y ~ b0 + b1 * x1 + b2 * x2. I know that regress function in Matlab ... /user/numpy-for-matlab-users.html). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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622 views

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numpy - Integrating functions that return an array in Python

I have a lot of data to integrate over and would like to find a way of doing it all with just matrices, and would be ... args = (a, b, c, d). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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596 views

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numpy - Python - C embedded Segmentation fault

I am facing a problem similar to the Py_initialize / Py_Finalize not working twice with numpy .. The basic ... as numpy. Thanks santhosh. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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829 views

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numpy - PIL: using fromarray() with binary data and writing coloured text

I've a basic problem with Python's library PIL. I have some .txt files containing only 0 and 1 values arranged ... . How can I change it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Any way to solve a system of coupled differential equations in python?

I've been working with sympy and scipy, but can't find or figure out how to solve a system of coupled differential ... ), v22(s), v12(s). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - How to compute cluster assignments from linkage/distance matrices in scipy in Python?

if you have this hierarchical clustering call in scipy in Python: from scipy.cluster.hierarchy import linkage # ... -- the cluster assignments? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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533 views

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numpy - Dynamically create a list of shared arrays using python multiprocessing

I'd like to share several numpy arrays between different child processes with python's multiprocessing module. I'd ... right way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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651 views

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numpy - ROC curve for binary classification in python

I am tying to plot an ROC curve for Binary classification using RandomForestClassifier I have two numpy arrays ... result in ipython? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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813 views

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numpy - ROC curve for binary classification in python

I am tying to plot an ROC curve for Binary classification using RandomForestClassifier I have two numpy arrays ... result in ipython? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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548 views

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numpy - Dynamically create a list of shared arrays using python multiprocessing

I'd like to share several numpy arrays between different child processes with python's multiprocessing module. I'd ... right way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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610 views

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numpy - ROC curve for binary classification in python

I am tying to plot an ROC curve for Binary classification using RandomForestClassifier I have two numpy arrays ... result in ipython? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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851 views

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numpy - Multivariate kernel density estimation in Python

I am trying to use SciPy's gaussian_kde function to estimate the density of multivariate data. In my code below I ... How do I visualize this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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567 views

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numpy - python pandas data frame if else without iterating thought data frame

I want to add a column to a df. The values of this new df will be dependent upon the values of the other ... () or apply () functions. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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532 views

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numpy - distance matrix of curves in python

I have a set of curves defined as 2D arrays (number of points, number of coordinates). I am calculating a distance ... i], Curves[j]) return D See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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653 views

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numpy - Saving an imshow-like image while preserving resolution

I have an (n, m) array that I've been visualizing with matplotlib.pyplot.imshow. I'd like to ... functionality already exists in matplotlib. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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814 views

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numpy - What is the fastest way to compute an RBF kernel in python?

I would like to compute an RBF or "Gaussian" kernel for a data matrix X with n rows and d columns. The ... fastest way to do this in python? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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731 views

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numpy - How to find the points of intersection of a line and multiple curves in Python?

I have data represented in the figure. The curves were extrapolated and I have a line whose equation is known. The ... ylabel('Y') plt.show() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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677 views

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numpy - Efficiently get indices of histogram bins in Python

Short Question I have a large 10000x10000 elements image, which I bin into a few hundred different sectors/bins. I ... with the number of bins. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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822 views

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numpy - Point inside polygon

I'm looking for a way to determine whether a particular point is within a polygon given its vertices using NumPy ... do this using NumPy/SciPy? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

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numpy - How to install in python 3.4 - .whl files

I recently tried to re-install numpy for python 3.4, since I got a new computer, and am struggling. I am on ... these? It was so much easier! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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744 views

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numpy - Python - Matrix outer product

Given two matrices A: m * r B: n * r I want to generate another matrix C: m * n, with each entry ... of doing this calculation to speed it up? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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988 views

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numpy - How to generate a distribution with a given mean, variance, skew and kurtosis in Python?

random.gauss(mu, sigma) Above is a function allowing to randomly draw a number from a normal distribution with a ... mu, sigma, skew, kurtosis) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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523 views

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numpy - Running Scipy on Heroku

I got Numpy and Matplotlib running on Heroku, and I'm trying to install Scipy as well. However, Scipy ... /www.scipy.org/Installing_SciPy/Linux See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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numpy - Calculate the Cumulative Distribution Function (CDF) in Python

How can I calculate in python the Cumulative Distribution Function (CDF)? I want to calculate it from an array of ... , for example, scipy has. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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644 views

1 answer

numpy - Obtaining values used in boxplot, using python and matplotlib

I can draw a boxplot from data: import numpy as np import matplotlib.pyplot as plt data = np.random.rand(100) ... , as it's already drawn. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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666 views

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numpy and scipy for preinstalled python 2.6.7 on mac OS Lion

Is there anyway to install numpy and scipy on python 2.6.7 that comes with Mac OS Lion? I am aware that Lion ... does not work on Python 2.7. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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784 views

1 answer

numpy - How to generate a randomly oriented, high dimension circle in python?

I want to generate a randomly oriented circle in R^n. I have been able to successfully generate points on the ... generate it in Python? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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