Recent questions tagged numpy

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numpy - A long term puzzle, how to optimize multi-level loops in python?

I have written a function in python to calculate Delta function in Gauss broadening, which involves 4-level ... script to increase efficiency? 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 - python code for multiple ode

I want to write a fourth order Adams Bashforth to solve the system. And the following is what I have : ... : too many values to unpack 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 - Python np.lognormal gives infinite results for big average and St Dev

I am trying to draw the lognormal distribution for my data. using the following code: mu, sigma = 136519., 50405. ... , linewidth=2, color='r') 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 - Python: Sliding windowed mean, ignoring missing data

I am currently trying to process an experimental timeseries dataset, which has missing values. I would like to calculate ... using a for loop? 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 implement Conflation for probability distribution in python?

I looked online for performing the combining several continuous probability distributions into one continuous probability ... import quad, simps, quad_vec, nquad, cumula...

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

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numpy - Understanding the error for scipy.optimize.minimize() function

I have a simple equation that I plotted via def chernoff_bound(beta): return 0.5 * np.exp(-beta * (1-beta) ... point me to the right track here! 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 - Reset cumsum if over limit (python)

The following numpy snippet will return a cumsum of the input array, which resets every time a NaN is encountered. v = np. ... 4,5,1,2,3,4,5] 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 np.roll() faster?

I'm using np.roll() to do nearest-neighbor-like averaging, but I have a feeling there are faster ways. ... to understand NumPy better. 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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numpy - Python multi-dimensional notation transpose automatically

I have the following minimal example: a = np.zeros((5,5,5)) a[1,1,:] = [1,1,1,1,1] print(a[1,:, ... what can I do to get the output I expected? 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 - Perform matrix multiplication between two arrays and get result only on masked places

I have two dense matrices, A [200000,10], B [10,100000]. I need to multiply them to get matrix C. ... and will contain only the needed elements? See Question&Answers more detail:os...

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

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708 views

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numpy - How to get X-coordinate of Path depending on the Y-coordinate when X-coordinate values are unknown using python

How I can get a point on the curve plotting when I have only one known Y-coordinate equation i.e. P = a * b ( ... (x_val,y_val, '--') 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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numpy - ValueError: index must be monotonic increasing or decreasing

ser3 = Series(['USA','Mexico','Canada'],index = ['0','5','10']) here ranger = range(15) I ... : index must be monotonic increasing or decreasing 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 - Python Pandas: Increase Maximum Number of Rows

I am processing a large text file (500k lines), formatted as below: S1_A16 0.141,0.009340221649748676 0.141,4 ... a greater number of rows? See Question&Answers more detail:os...

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

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640 views

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numpy - python difference between the two form of matrix x[i,j] and x[i][j]

i want to understand the difference between x[i,j] and x[i][j] where x is a matrix x = np.zeros((N,M)) ... ) there is a number of j (users) 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 - scipy.optimize.curve_fit: not a proper array of floats error

I'm trying to use optimization.curve_fit to find the least square solution between two arrays, but I keep ... curve_fit(func, pcone, pctwo) 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 - Find minimum cosine distance between two matrices

I have two 2D np.arrays let's call them A and B, both having the shape. For every vector in 2D array A I ... way to achieve what I want faster? See Question&Answers more detail:os...

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

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820 views

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numpy - Coverting Back One Hot Encoded Results back to single Column in Python

I was doing Multi-class Classification using Keras.It contained 5 classes of Output. I converted the single class vector to ... [3,4,0,3,2] 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 - python convolution with different dimension

I'm trying to implement convolutional neural network in Python. However, when I use signal.convolve or np. ... to do convolution efficiently? See Question&Answers more detail:os...

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

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808 views

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numpy - How can I make a greyscale copy of a Surface in pygame?

In pygame, I have a surface: im = pygame.image.load('foo.png').convert_alpha() im = pygame.transform.scale( ... data to grayscale? I have numpy. See Question&Answers more detail:os...

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

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778 views

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numpy - Display a .png image from python on mint-15 linux

I am trying to display a .png file I constructed using the following. import pydot, StringIO dot_data = StringIO. ... titanic.png") image.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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1.3k views

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numpy - Python - read text file with weird utf-16 format

I'm trying to read a text file into python, but it seems to use some very strange encoding. I try the usual ... to deal with this crazy file. See Question&Answers more detail:os...

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

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981 views

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numpy - Python fsolve() complains about shape. Why?

Having the function f(x,y,z), I need to solve the restriction f(x,y,z) = 0 and then plot it. I ... returns True. Why does fsolve() complain? See Question&Answers more detail:os...

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

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855 views

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numpy - How to find PSNR and SSIM of two video files in python using openCV and other libraries?

I want to find out PSNR and SSIM of two video files in python using openCv and numpy. How to find PSNR in python I tried ... ), (0, 0, 255), 2) See Question&Answers more detail:os...

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

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893 views

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numpy - Fitting with constraints on derivative Python

While trying to create an optimization algorithm, I had to put constraints on the curve fitting of my set. Here ... help me achieve this task ? See Question&Answers more detail:os...

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

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922 views

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numpy - Solve system of linear integer equations in Python

I am looking for a method to solve a system of linear equations in Python. In particular, I am looking for ... s algorithm will work for 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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763 views

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numpy - Passing structured array to Cython, failed (I think it is a Cython bug)

Suppose I have a = np.zeros(2, dtype=[('a', np.int), ('b', np.float, 2)]) a[0] = (2,[3,4]) a[ ... got 1 My question is how to fix it? Thank you. See Question&Answers more detail:os...

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

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723 views

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numpy - Cython function taking more time than pure python

I am trying to accelerate my code and this part of it is giving me problems, I tried to use Cython and then ... wrong ? Thanks for your help, See Question&Answers more detail:os...

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

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880 views

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numpy - Floating point precision in Python array

I apologize for the really simple and dumb question; however, why is there a difference in precision displayed for ... > t [0.23999999999999999] See Question&Answers more detail:os...

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

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