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
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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 ...
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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
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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 ...
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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....
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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 ...
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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 ...
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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
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1
answer
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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 ...
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1
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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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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 ...
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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 ...
