Recent questions tagged numpy

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numpy - Python finite difference functions?

I've been looking around in Numpy/Scipy for modules containing finite difference functions. However, the closest thing I ... which I don't have. 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 "an intermediate result is being cached" mean?

I have a set of n vectors stored in the 3 x n matrix z. I find the outer product using np.einsum. When ... , but the slowest maybe more typical. 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 - Load just part of an image in python

This might be a silly question, but... I have several thousand images that I would like to load into Python and ... arrays data = np.array(imc) 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 vectorizing nested for loops

I'd appreciate some help in finding and understanding a pythonic way to optimize the following array manipulations in ... and radius is an int 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 - Multivariate spline interpolation in python/scipy?

Is there a library module or other straightforward way to implement multivariate spline interpolation in python? ... really appreciate it. 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 - LogisticRegression: Unknown label type: 'continuous' using sklearn in python

I have the following code to test some of most popular ML algorithms of sklearn python library: import numpy as np from ... (15.72 vs 3.95)? 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 to overplot a line on a scatter plot in python?

I have two vectors of data and I've put them into matplotlib.scatter(). Now I'd like to over plot a ... tried using scikitlearn and np.scatter. 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 - Counting Cars OpenCV + Python Issue

I have been trying to count cars when crossing the line and it works, but the problem is it counts one ... The individual frames of the video look as follows: Question&Answers:os...

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

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numpy - Finding the nearest value and return the index of array in Python

I found this post: Python: finding an element in an array and it's about returning the index of an array through ... in Python? Thank you so much for your help! Question&Answers:os...

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

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numpy - Saving to hdf5 is very slow (Python freezing)

I'm trying to save bottleneck values to a newly created hdf5 file. The bottleneck values come in batches of shape ... if works perfectly and ends within a min. Question&Answers:os...

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

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numpy - TypeError: only length-1 arrays can be converted to Python scalars while plot showing

I have such Python code: import numpy as np import matplotlib.pyplot as plt def f(x): return np.int(x) x = ... be converted to Python scalars How can I fix it? Question&Answers:os...

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

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numpy - selecting across multiple columns with python pandas?

I have a dataframe df in pandas that was built using pandas.read_table from a csv file. The dataframe has ... ? How are these implemented in pandas? Thanks. Question&Answers:os...

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

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numpy - Inverse Distance Weighted (IDW) Interpolation with Python

The Question: What is the best way to calculate inverse distance weighted (IDW) interpolation in Python, for point ... with the aid of scipy a wise choice? Question&Answers:os...

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

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numpy - InfogainLoss layer

I wish to use a loss layer of type InfogainLoss in my model. But I am having difficulties defining it properly ... read only once for all the training process? Question&Answers:os...

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

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numpy - What does "three dots" in Python mean when indexing what looks like a number?

What is the meaning of x[...] below? a = np.arange(6).reshape(2,3) for x in np.nditer(a, op_flags=['readwrite']): x[...] = 2 * x Question&Answers:os...

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

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numpy - how to extract frequency associated with fft values in python

I used fft function in numpy which resulted in a complex array. How to get the exact frequency values? Question&Answers:os...

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

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numpy - Calculating Pearson correlation and significance in Python

I am looking for a function that takes as input two lists, and returns the Pearson correlation, and the significance of the correlation. Question&Answers:os...

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

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numpy - How to implement the Softmax function in Python

From the Udacity's deep learning class, the softmax of y_i is simply the exponential divided by the sum of ... and time complexity? Which is more efficient? Question&Answers:os...

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

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numpy - Plotting a fast Fourier transform in Python

I have access to NumPy and SciPy and want to create a simple FFT of a data set. I have two lists, one that ... Spacing is just equal to xInterp[1]-xInterp[0]. Question&Answers:os...

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

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numpy - What's the fastest way in Python to calculate cosine similarity given sparse matrix data?

Given a sparse matrix listing, what's the best way to calculate the cosine similarity between each of the ... could best be accomplished? Thanks in advance. Question&Answers:os...

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

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numpy - Multiple linear regression in Python

I can't seem to find any python libraries that do multiple regression. The only things I find only do simple regression. I ... + a4x4 + a5x5 + a6x6 + +a7x7 + c Question&Answers:os...

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

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numpy - How to apply piecewise linear fit in Python?

I am trying to fit piecewise linear fit as shown in fig.1 for a data set This figure was obtained by setting ... range. How can this be done in Python? Question&Answers:os...

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

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numpy - How do you use the ellipsis slicing syntax in Python?

This came up in Hidden features of Python, but I can't see good documentation or examples that explain how the feature works. Question&Answers:os...

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

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numpy - understanding matplotlib.subplots python

This question already has answers here: Question&Answers:os...

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

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numpy - How to solve a pair of nonlinear equations using Python?

What's the (best) way to solve a pair of non linear equations using Python. (Numpy, Scipy or Sympy) eg ... snippet which solves the above pair will be great Question&Answers:os...

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

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numpy - Automatically import modules when entering the python or ipython interpreter

I find myself typing import numpy as np almost every single time I fire up the python interpreter. How ... interpreter so that numpy is automatically imported? Question&Answers:os...

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

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numpy - How to install python modules without root access?

I'm taking some university classes and have been given an 'instructional account', which is a school account ... administrator. How can I do the installation? Question&Answers:os...

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

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numpy - How to do exponential and logarithmic curve fitting in Python? I found only polynomial fitting

I have a set of data and I want to compare which line describes it best (polynomials of different orders, ... there any? Or how to solve it otherwise? Question&Answers:os...

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

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