How can I define a 3d array from a 2d array that depends on a parameter? Question: I have a matrix with 2 dimensions M = np.array([[0.5+t, 1, 1], [0.5, 0.5, t], [0.5, 1-t, 0.5]]) I want to compute some properties of this matrix for several values of $t$. I could do it witn a …
Vectorizing to find current number of cars in Python – loop free Question: I wish to do this without a loop (for speed and learning how to). In order to find out how many cars there currently is in the market, imagine you have sales numbers for all years from 1923 up until today. This …
Compare each string with all other strings in a dataframe Question: I have this dataframe: mylist = [ "₹67.00 to Rupam Sweets using Bank Account XXXXXXXX5343<br>11 Feb 2023, 20:42:25", "₹66.00 to Rupam Sweets using Bank Account XXXXXXXX5343<br>10 Feb 2023, 21:09:23", "₹32.00 to Nagori Sajjad Mohammed Sayyed using Bank Account XXXXXXXX5343<br>9 Feb 2023, 07:06:52", "₹110.00 to …
Vectorized calculation of new timeseries in pandas dataframe Question: I have a pandas dataframe and I am trying to estimate a new timeseries V(t) based on the values of an existing timeseries B(t). I have written a minimal reproducible example to generate a sample dataframe as follows: import pandas as pd import numpy as np …
How to use numpy instead of for loop with different vectors Question: I want to improve my code to make it faster and for now, I have a for loop that I don’t know how to replace it with numpy functions. import numpy as np N = 1000000 d = 2000 p = np.linspace(0,210,211) alpha …
Vectorization a code to make it faster than this Question: I have a little bit code which I’ll have to vectorizate it to make it faster. I’m not very attached into python and thinking that the for loop is not so efficient. Is there any way to reduce the time? import numpy as np import …
Transform 2d numpy array into 2d one hot encoding Question: How would I transform a=[[0,6], [3,7], [5,5]] into b=[[1,0,0,0,0,0,1,0], [0,0,0,1,0,0,0,1], [0,0,0,0,0,1,0,0]] I want to bring notice to how the final array in b only has one value set to 1 due to the repeat in the final array in a. Asked By: cooldude3139 || Source …
Find first occurrence of Price value which is greater than current value in Pandas dataframe using vectorization Question: lets take this example Pandas dataframe which has two columns [‘date’] and [‘price’]: [‘date’] is ascending always [‘price’] is random df = pd.DataFrame({ ‘date’:[’01/01/2019′,’01/02/2019′,’01/03/2019′,’01/04/2019′,’01/05/2019′,’01/06/2019′,’01/07/2019′,’01/08/2019′,’01/09/2019′,’01/10/2019′], ‘price’: [10,2,5,4,12,8,9,19,12,3] }) the goal is to add two more columns [‘next_date’] contains …
Vectorize a function in NumPy Question: I have the following function from numpy.random import default_rng def foo(args): [a, x, y, z, b1] = args vals = np.random.uniform(0, 10, a) rr= np.random.uniform(1, 2, a) u_1 = vals – x u_2 = vals * rr – y u_3 = vals / rr – z Q = sum(sum(u_1[None, …
numpy vectorization of cellular automata Question: Trying to optimize my current implementation of a program that generates cellular automata using Wolfram Numbering. I am having trouble applying the rule to the board after calculating the neighbors for each cell. The current example uses 2 states and is the same as Conway’s Game of Life, but …
