Questions tagged [numpy]
NumPy is one of the many modules in Python that adds support of large multidimensional arrays and matrixes, along with a large library of high-level mathematical functions for operations with these arrays.
numpy
114,449
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Will the NumPy broadcast array ever be created during a binary operation?
I have two numpy.ndarray instances with different shapes. If I add these two arrays, broadcasting will occur between them:
import numpy as np
x = np.array([1, 2, 3])
y = np.array([[2, 3, 5],
...
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1
answer
45
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Calculate distances in a shape with python
I want to calculate the min vertical distance and max horizontal distance of this image.
Like the lines.
I was trying:
_, binary_image = cv2.threshold(image, 0, 255, cv2.THRESH_BINARY)
...
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num_samples = set(int(i.shape[0]) for i in tree.flatten(data)) IndexError: tuple index out of range (Tensorflow)
When trying to train an Tensorflow LSTM I am getting the following error:
File "C:\Users\user\Documents\LSTM_Volatility.py", line 66, in <module>
model.fit(x_train , ...
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Python: Diagonalize a matrix of very high dimension?
Currently I am working on a problem which involves diagonalizing a matrix to get the eigen values and eigen vector. But now I want to expand the problem to a dimension of 200,000 x 200,000 in size.
I ...
2
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1
answer
61
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Why do NumPy scalars multiply with custom sequences but not with lists?
I have a question to NumPy experts. Consider a NumPy scalar: c = np.arange(3.0).sum(). If I try to multiply it with a custom sequence like e.g.
class S:
def __init__(self, lst):
self....
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1
answer
31
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Lattice-boltzmann simulation runs over the object mask, simulating areas that should be just black
I'm trying to simulate a tesla valve using the method, starting from
this code.
The problem is that the mask, the boundaries, or the bounce-back are not being applied correctly.
If I reverse the ...
- 21
1
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2
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27
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sharex and imshow do not produce plots of the same width
Context: I have the x,y and x,z projection of an image. I want the two images to be stacked vertically sharing the same width.
My trial: I tried the following:
import numpy as np
import matplotlib....
- 2,318
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1
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32
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Pandas apply is turning matrices into nan/None
I am running the following code on a dataset trying to tally the rows from one data set that match a varied set of criteria. I am using the apply function to store this tally inside of a matrix, where ...
0
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25
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How to interpolate a 2D Scatter plot in python
I have the following problem: I am working with ultrasonic data from a sector scan. An example is shown in the following:
From the file I am reading I receive a 2D array. One dimension is the phase ...
- 69
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34
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How to solve Process finished with exit code -1073741819 (0xC0000005) in Python? [closed]
I am using Python 3.8 in Pycharm. I have Windows 10 and wanted to reproduce this publicly available code:
#!/usr/bin/env python
# -*- encoding: utf-8 -*-
import sys
sys.setrecursionlimit(4000)
import ...
1
vote
1
answer
18
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Jax vs numpy for generating Heston paths
I have this python code (from QuantPy) which generates stock paths under the Heston model using numpy. I am trying to convert it to using Jax. For some reason, the numpy version runs in about 2 ...
- 23
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1
answer
48
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How to combine type hint using bound type variable and static types for maximum flexibility?
I would like to add type hints to a simple function. Since it internally only uses numpy calls, it is very flexible with its inputs. Basically, it accepts all array-like objects, for which there is ...
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i am in the process of using pandasai, but keep getting this error from pandas.compat import is_numpy_dev as _is_numpy_dev
from pandas.compat import is_numpy_dev as _is_numpy_dev # pyright: ignore # noqa:F401
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
i am running numpy version 2
python version 3.11
pandas 1....
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2
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2
answers
35
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Dictionary indexing with Numpy/Jax
I'm writing an interpolation routine and have a dictionary which stores the function values at the fitting points. Ideally, the dictionary keys would be 2D Numpy arrays of the fitting point ...
- 482
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1
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65
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Python numpy, math: Any way raising a negative number to a decimal power without resulting in Nan?
I am getting errors trying to raise a negative number to a decimal power. For example, I want to calculate this
(-2)^(4.8) which should result in valid, real number output (27.85 from my TI-89).
I ...
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0
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14
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Deep learning problem for boundary detections [closed]
import numpy as np
#Reference: https://stackoverflow.com/questions/55890813/how-to-fix-object-arrays-cannot-be-loaded-when-allow-pickle-false-for-imdb-loa
np_load_old = np.load
# modify the default ...
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answers
23
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numpy.dtype size changed, may indicate binary incompatibility. Expected 96 from C header, got 88 from PyObject error
I am trying to import pmdarima but it gives the error ValueError: numpy.dtype size changed, may indicate binary incompatibility. Expected 96 from C header, got 88 from PyObject
I uninstalled numpy ...
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1
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45
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Issue with Custom Rounding Function in Python Pandas
I have implemented a custom rounding function in Python using Pandas, but it's not producing the expected results in certain cases. It basically should always round down to the nearest step.Here's the ...
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how can I compute the striking force of a football player using python [closed]
in a football match between England and Spain Julius Fueke needs a decisive goal, write a Python program that can compute the striking force of each of the players
i tried using the import numpy but ...
- 1
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18
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How to "average out" multiple curves with sklearn Lasso regression?
The lecture slides here: https://www.cs.cmu.edu/~ggordon/10725-F12/slides/09-acceleration.pdf on page show multiple lines on a convergence plot apparently "averaged out" with Lasso ...
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1
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60
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Generate n random 2D points within a valid region
I want to generate a fixed number of random-uniformly distributed xy points within a valid mask.
The generated points should be continuous, i.e. can be "between pixels".
I'm looking for an ...
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1
answer
24
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How to extract graph edges in a specific order from networkx?
I am trying to find the shortest path that passes through a set of points that are pretty much aligned. This needs to work in all directions, so I can't just sort them by x or y values.
The solution I ...
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1
answer
54
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image to ascii art with edge detection using the sobel filter in python using pygame not rotated correctly
I have to layers of ascii art, one for the sobel filter, one for the general ascii art. I then overlap then and, because the sobel filter is initially only 0, using a simpe filter. The code works for ...
- 25
-3
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0
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30
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Neural Network cost not changing [closed]
I can't seem to figure out why my cost print function is giving me the same cost every time and my weights and biases are not changing. Help would be greatly appreciated and I have tried putting it ...
-1
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0
answers
25
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A problem with Importing Matplotlib (A module that was compiled using NumPy 1.x) [duplicate]
When I'm trying to import matplotlib by the following standard code:
import matplotlib.pyplot as plt
I'm getting the following error massage:
A module that was compiled using NumPy 1.x cannot be run ...
- 19
3
votes
1
answer
44
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Why the addion of float32 array and float64 scalar is float32 array in Numpy?
If one add float32 and float64 scalars, the result is float64: float32 is promoted to float64.
However, I find that, adding a float32 array and a float64 scalar, the result is a float32 array, rather ...
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22
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Numpy dependency errors while installing the RPM Package
I've created a RPM Package for a python application using setuptools and rpmbuild,
the application need few modules like numpy,flask..etc,I've install all the modules in the package itself.
but while ...
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0
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38
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A property of Python class returns an empty numpy array with pybind11
I adopted a project that was abandoned by it's original creator on GH: pybind11 bindings for whispercpp. I had to update Python version from 3.8 to 3.11.8 in CI and discovered that some of the test ...
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1
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41
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Sobel filter implementation in Pygame is not detecting vertical edges but only horizontal ones
I wanted to apply the Sobel filter to an image for edge detection with the vectors and tried it on some test images, but it only marked the vertical edges despite seeing the horizonal edges.
The full ...
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42
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How can I build my Flutter app to use Python for OpenCV and Numpy? [closed]
I'm developing a Flutter app for iOS that requires image processing using Python, specifically with OpenCV and NumPy. I'm facing several challenges and would appreciate guidance on the best approach:
...
