Category "numpy"

How to calculate values in Pandas Dataframe itself?

You can see my dataframe below, x values are different value, but other values are same with left values, for example, column 15 and column 16 are same value. I

Any efficient analogue of argsort for array of indices with NumPy?

I have an array of indices like a = [2, 4, 1, 0, 3] and I want to transform it into np.argsort(a) = [3, 2, 0, 4, 1]. The problem is that argsort has O(n*log(n))

What is the best way in numpy to use a vector of positions as indexes in a an nd array?

I have a numpy array of agents positions: positions = np.array([[row_0, col_0], [row_1, col_1], [row_2, col_2]]) I

Calculate the pair-wise correlation between distinct class pairs over two feature columns and the target variable?

Most similar questions relating to calculating this involve a single correlation value for each feature column, showing how the features in a dataset correlate

How to use dictionary data initialized in a "class" object

I expose the problem quickly: I have to create 3 classes. X Y and Z, inside X y and z are initialized as variables of class x but not as objects Y and Z. What i

convert matplotlib figure to 2-D Array to show in pyqtgraph.ImageItem

i find an example in this Link which show 2-D array in pyqtgraph.ImageItem. import matplotlib.pyplot as plt import numpy as np import pyqtgraph as pg def main(

Assign values from irregular grid points to standard grid points using interpolation

I have (a lot of) data like below y = [1, 3, 4, 5] which corresponds to the grid points x = [1, 2, 3, 4] On the other hand, I have a standard grid X = [1, 3]

Cosine similarity and cosine distance formulas relation

Can someone explain these two formulas? Do they have any relationship? def _cosine_distance(a, b, data_is_normalized=False): if not data_is_normalized:

Numpy Array is not copying over all values of the array to csv file

I'm having trouble with the formatting of my array when it it saved to a csv file, each time I run the program I get a different result, sometimes the string "c

How to iterate over rows of each column in a dataframe

My current code functions and produces a graph if there is only 1 sensor, i.e. if col2, and col3 are deleted in the example data provided below, leaving one col

np.histogram outputs?? - Python

Trying to understand what kind of output do I get from the histogram function. phase = mod(phase,Nper*2*pi) cl_phase = arange(0,Nper*2*pi+step,step) c,p = histo

Why is not the following 3D polar plot of Array Factor being plotted?

import numpy as np import math as mt import matplotlib.pyplot as plt import mpl_toolkits.mplot3d.axes3d as axes3d #############################################

How to plot some datasets in pandas based on different thresholds in python

I have a data frame that has 3 columns and I want to plot a line graph based on some thresholds. Here is the data frame date income ratio 0 2022-0

Get two neighboring non-nan values in numpy array

Let's say I have a numpy array my_array = [0.2, 0.3, nan, nan, nan, 0.1, nan, 0.5, nan] For each nan value, I want to extract the two non-nan values to the lef

GCloud compute tunnel always shows warning telling to install numpy

I am setting up a tunnel with gcloud from a remote machine with: gcloud compute start-iap-tunnel ... Everything used to be fine until a few days ago when it st

Polynomial Expansion without sklearn

I want to try and recreate this functions from scratch (without using sklearn): # The matrix is M which is 1000x10 matrix. from sklearn.preprocessing import Po

Filtering out rows in multidimensional numpy arrays

Let's say that I have an array like this: array([[ 1, 2], [-1, -2], [ 0, 0], [-1, 2], [ 2, -1]]) I want to filter out all rows t

How to select 3d array elements with another 3-d array of coordinates?

Let's say I have two array, one with all zero elements and the second one with indices that should be filled with 1. This can be done with the following code: A

Customized search for consequtive values in numpy array

Please assume the following NumPy array: A = array([1, 1, 0, 1, 0, 0, 0, 0, 0, 0]) I would like to find the indices of this array that N consecutive values are

Trying to save image from numpy array with PIL, getting errors

trying to save an inverted image, saved inverted RGB colour data in array pixelArray, then converted this to a numpy array. Not sure what is wrong but any help