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
114,582
questions
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Numpy: Sum N successive array elements, where N comes from a list
Here is code I am trying to optimize:
import numpy as np
rng = np.random.default_rng()
num = np.fromiter((rng.choice([0, 1], size=n, p=[1-qEff, qEff]).sum()
for n in num), dtype='...
- 179
1
vote
1
answer
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How do I effectively compute pairwise quantities in numpy?
I want to compute pairwise quantities, e.g. distances between two points.
A simple example would be
import numpy as np
N = 9
x = np.linspace(0,1,N)
y = np.abs(x - x[:,None]) # pairwise 1d eucdlidian ...
- 23
0
votes
1
answer
35
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Unable to install numpy through terminal using pip
I'm trying to install the python package numpy with no luck. I'm using pip install numpy in the terminal, but it returns the following error message:
WARNING: Retrying (Retry(total=0, connect=None, ...
1
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0
answers
109
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ModuleNotFoundError: No module named 'numpy._core'
I am trying to load a .npy file created on my local PC with np.save() in google colaboratory. However, when I try to open it on Google Colab with np.load() I get this error: ModuleNotFoundError: No ...
- 34
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2
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68
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How to transform nested arrays by extending the dimension of the array
Suppose I have an array X with N elements. I would like then to input this array into a 2D array A as follows
X=np.array([0,1,2,3],dtype=np.float64)
A=np.array([[0,0,X],
[0,X,0]],dtype=np....
- 173
0
votes
1
answer
44
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What is the meaning of: Pandas data cast to numpy dtype of object. Check input data with np.asarray(data) and how can be solved?
I'm trying to model a time series for a stock price with the following code:
import opendatasets as od
import numpy as np
import pandas as pd
import plotly.graph_objects as go
from plotly.subplots ...
- 201
-2
votes
1
answer
42
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I'm getting an "src is not a numerical tuple" for an opencv program I'm developing that works in their official documentation but not for me [closed]
I'm creating a python program and trying to get feed from a camera and then perform a fourier transform on it to see its spectrum. I've been trying to initialize the camera with cv2.imread() but for ...
-2
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0
answers
15
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pyassimp.errors.AssimpError: assimp library not found [closed]
(CGIP) ┏[vbk16] ┖[E:\6th Sem\CG\Mini_Project]> python .\Program.py Traceback (most recent call last): File "E:\6th Sem\CG\Mini_Project\Program.py", line 7, in <module> import ...
0
votes
1
answer
55
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Efficient stochastic numerical integration over many trajectories
I am implementing a numerical method for solving stochastic differential equations using the Euler-Maruyama method.
What I have works, but it is not efficient. The reason is that because of the ...
- 173
0
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0
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20
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read parquet file in dask and convert them to correct numpy shape
I am reading a parquet file in dask and trying to reshape it to how I want it, but it seems rather impossible (I am quite new to dask too).
So, I have a parquet file which has some 8M x 384d numpy ...
- 6,996
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0
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36
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How do I solve the following error message: SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats
I have been trying to run the following code:
import pyaudio
import numpy as np
from math import pi
def make_sinewave(frequency, length, sample_rate=44100):
length = int(length * sample_rate)
...
- 99
0
votes
1
answer
42
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How can I deal with passing 360 degrees when I linearly interpolate between two headings?
A part of my python program linearly interpolates between two compass headings. It works fine as long as I don't have to deal with passing through North. Is there a good way to deal with this rather ...
0
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0
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38
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Why print(f"{variable = }") in Python 3.12 also prints numpy type?
I noticed, that with Python 3.12 and a numpy.float64 when I simply do a
x = numpy.sqrt(3) # type is <class 'numpy.float64'> now
print(f"{x = }")
# this is printed
>>>x = np....
- 1
0
votes
1
answer
33
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Computing and Visualizing Linear Trends in Ocean Temperature Data
I have a dataset containing ocean temperature values for the time period 1950-2022, covering the entire globe. My goal is to calculate the linear trend for each surface grid box and visualize the ...
- 21
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2
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82
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How can I get the subarray indicies of a binary array using numpy?
I have an array that looks like this
r = np.array([1, 0, 0, 1, 1, 1, 0, 1, 1, 1])
and I want an output of
[(0, 0), (3, 5), (7, 9)]
right now I am able to accomplish this with the following function
...
- 13.5k