I want to iterate over some inner dimensions of an array without knowing in advance how many dimensions to iterate over. Furthermore I only know that the last two dimensions should not be iterated over. For example assume the array has dimension 5 and shape (i,j,k,l,m) and I want to iterate over the second an…
Tag: numpy
Insert $ in front of numbers in column using Pandas
I wish to add dollar symbol in front of all the values in my column. Data Desired Doing I believe I have to map this, not 100% sure. Any suggestion is appreciated. Answer You can also try
Derivative using Numpy or Other Library for lambda sin function
So i have this newton optimation problem where i must found the value f'(x) and f”(x) where x = 2.5 and the f = 2 * sin(x) – ((x)**2/10) for calculating, but i tried using sympy and np.diff for the First and Second Derivative but no clue, cause it keep getting error so i go back using manual deriv…
How to prevent np.where from turning 0 into ‘0’?
I want to create an array with np.where that has strings and 0s in it. So usually its dtype would be ‘object’. Minimal example: As a result I get I would like those ‘0’s to be 0s. Since np.where has no argument for dtype, I don’t know how to do this except by replacing them after…
Why are python dates such a mess and what can I do about it?
A common source of errors in my Python codebase are dates. Specifically, the different implementations of dates and datetimes, and how comparisons are handled between them. These are the date types in my codebase You can print them to see: Is there a canonical date representation in Python? I suppose x7: date…
Optimize conversion of numpy ndarray to string
I am currently doing a python program to convert from image to hex string and the other way around. I need two functions, one that takes an image and returns a hex string that corresponds to the RGB values of each pixel, and another function that takes a hex string, two ints, and generates a visible image of …
How do I generate a small image randomly in different parts of the big image?
Let’s assume there are two images. One is called small image and another one is called big image. I want to randomly generate the small image inside the different parts of the big image one at a time everytime I run. So, currently I have this image. Let’s call it big image I also have smaller imag…
Count the number of complex, real and pure imaginary numbers in a numpy matrix
Given a Numpy array/matrix, what is pythonic way to count the number of complex, pure real and pure imaginary number: Note: Please ignore the fact that complex numbers are superset of Imaginary and Real numbers. Answer complex A number is complex if and only if its imaginary part is not zero, and its real par…
Sorting lists with multiple tie breakers
I have data in an array like so: I want to sort it by the amount of non-10 values, and I also want to sort it in ascending order for rows, and in descending order of number of 10s: Output: I want to implement a tie breaker system so that if the amount of 10s the same, it now orders
How do i convert a modified list of The Alphabet into a number?
i want to convert the sentence from variable (salam) into numbers. The conversion table is like a modified alphabet just like in (char2). My expected output is a 3×3 matrix, inside is the converted number from(salam) using (char2) and the output is here is the image for clarity Answer The problem is from…