Below shows the output from numpy.ix_() function. What is the use of the output? It’s structure is quite unique. Answer According to numpy doc: Construct an open mesh from multiple sequences. This function takes N 1-D sequences and returns N outputs with N dimensions each, such that the shape is 1 in all but one dimension and the dimension with
Tag: arrays
How to save Python 1D, 2D or 3D NumpPy array into MATLAB .mat
Python’s SciPy package has a function that saves Python variable into MATLAB’s .mat file https://docs.scipy.org/doc/scipy/reference/generated/scipy.io.savemat.html However, the documentation lacks examples, and I don’t know what is the dictionary of variables it wants as an input. Say I have a 2D NumPy array A and a 3D NumPy array B, how do I save them into a .mat file called my_arrays.mat?
How to ignore numbers after specific number in the list/array in Python?
I’m stuck on this problem: I was trying to return sum of list of numbers in the array ignoring sections of numbers starting with a 6 and extending to the next 9 (every 6 will be followed by at least one 9). Return 0 for no numbers. Here are my test cases: I came up with something like: Answer i
Finding immediate smaller than X
So, we have been provided with a list and a value X. In the given list we have to find the immediate smaller value than X. Here is my code. Where am I doing it wrong? I am also attaching the provided test cases and the test case which I am not able to pass. I was able to pass
Detect duplicate elements python
I get continuously data from a server and can receive the data via the following line of code: After that I would like to write them into a file via: Now the case is, that the same id can appear multiple times, but the value will be a different one. Therefore I would like to extend the out.write into the
Improvement on copy array elements numpy
I have a question regarding variable assignation and memory allocation in a simple case. Imagine that I am initialising a state vector x, with initial value x0. I am then making iterative updates on that state vector with buffer array X and after each iteration, I store the new state vector in a storage list L. An outline of my
How to add 2D np array to front of 3D np array?
I have a 3D numpy array and I want to add a 2D np array of 0’s to the front of it. I want to add another array B so that: I’ve tried np.append(B,A) but it returns a 2D array. Answer You can do it using numpy.vstack and by reshaping your array. For instance: By the way, you can create
Binary Insertion Sort vs. Quicksort
I was looking at different sorting algorithms and their performance (link) and then I tried to implement some sorting algorithms myself. I wanted to improve them as well and so, as I was coding the insertion sort, I thought why not to use binary search, as the first part of array is already sorted, and in order to get rid
Leetcode problem to remove instances of a value in an array
The instructions were: Given an array nums and a value val, remove all instances of that value in-place and return the new length. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. The order of elements can be changed. It doesn’t matter what you leave beyond the
You are given an array consisting of n integers. Print the last two digits of the product of its array values [duplicate]
This question already has answers here: Get a list of numbers as input from the user (11 answers) Returning the product of a list (16 answers) Last 2 digits of an integer? Python 3 (5 answers) Closed 11 months ago. Input The first line of input contains an integer n, which is the number of elements in the given array.