Idiomatic way to do list/dict in Cython?

My problem: I've found that processing large data sets with raw C++ using the STL map and vector can often be considerably faster (and with lower memory footprint) than using Cython. I figure that...

What is the fastest way to output large DataFrame into a CSV file?

For python / pandas I find that df.to_csv(fname) works at a speed of ~1 mln rows per min. I can sometimes improve performance by a factor of 7 like this: def...

Fast interpolation of regularly sampled 3D data with different intervals in x,y, and z

I have some volumetric imaging data consisting of values sampled on a regular grid in x,y,z, but with a non-cubic voxel shape (the space between adjacent points in z is greater than in x,y). I...

Get possible array combinations

SO, The problem From SQL I'm getting an array with strings (flat array) - let it be $rgData = ['foo', 'bar', 'baz', 'bee', 'feo']; Now, I want to get possible combinations of pairs and triplets...

How to apply style to a specific element in JQuery array

I am learning the basics of JQuery, and can't solve this problem: given 3 green <li> elements turn 1-st and 3-rd elements to red color, and the 2-nd element to orange. Code: <!DOCTYPE...

Skip blank lines while reading .csv file using opencsv (java)

Good day everyone! My target is to make csv reader to skip the blank lines while parsing a file, do nothing basically, only get me the rows with at least one value. At the moment I have two...

General error: 1366 Incorrect string value in Laravel/Mysql

I have designed laravel app to fetch mails using php imap. In kernel I have written code to fetch all mailboxes, below is my code for fetching mails from mailbox <?php namespace App\Console; use...

How to insert zeros between elements in a numpy array?

I have an nd array, for example this: x = np.array([[1,2,3],[4,5,6]]) I would like to double the size of the last dimension, and insert zeroes between the elements to fill the space. The result...

Change css on button using CSS

I want to change the simple whatsapp green button to the glowing css nice button like this ----->>> (function ($) { $.fn.floatingWhatsApp = function (options) { var settings =...

PHP/Javascript - Add payment method with Stripe API

I am using Wordpress, but I am using an "out of the box" solution because my client requested it specifically. I have this Javascript which creates a form and when the form is submitted it creates...

Apply Filter function to select multiple rows of a CSV in D3.js

I have a data table with the following format: Month,KPI,Type,Unit,S40401,S40402,S40403 JAN,A,Units FTP,PC,2000,4000,6000 JAN,B,Invoice Sales FTP,EUR,2000,4000,6000 JAN,C,Gross...

How to convert ND array to 1D and revert it back

I need to convert n array (dimension is not known) to 1d and revert it back to nd array. I loop through the whole array and add elements to 1d to convert, but I don't know how to revert it...

Training Hidden Markov model with GMM, nan appears after some iterations in python

Problem During the training process of my continuous observation sequence data using HMM with GMM mixtures, the cost function reduces gradually and it becomes NaN after some iterations. Background...

Convert R dataframe into a 3-dimensional array

I have an R dataframe that has N rows and 6 columns. For exemplification I will use following column names: "theDate","theIndex","Component_1","Component_2","Component_3","Component_4" I am trying...

Using JavaScript functions to add dynamic HTML content

I am trying to display vehicle data from a constructor dynamically on an HTML page as individual cards (Each card will include an image, a make, a model, a colour, registration number and price)....

Scatter Plot between 2 images Google Earth Engine

I have 2 high-resolution images in Google Earth Engine. I want to plot a scatter between these 2 images. But I am getting some error Missing required arguments to function seriesByRegion():...

How to reduce the number of iterations in a program where number of elements in the test case is very large?

Please refer to this problem from Hackerrank HackerLand National Bank has a simple policy for warning clients about possible fraudulent account activity. If the amount spent by a client on a...

C++ trying to create a point from the provided coordinates

For this I should be able to construct a point from a pointer (double *coordinates_) and from the number of dimensions it has (size_t dimensions_ ) which is like 2d, 3d, #d. I have this...

Don't understand Django's ORM - Models

As I'm having some spare time these days I decided that it would be nice to learn a new language. So I picked python because of its popularity and because I got interested in Django. Some hours...

Error when I load my own data using ViSEAGO create_topGO

I have trouble creating topGO object using my own data. Wondering if someone can help me with this! I'm following a couple of tutorials and steps mentioned in the original ViSEAGO paper. Here are...

Binary matrix with (max 2) contiguous blocks of 1's as rows, calculate trace of its square

Let A be an nxn binary matrix whose rows are of the form 0^k 1^l 0^m or 1^k 0^l 1^m. Also, A has zeros along the diagonal. The dimension n can be up to 10^5. The matrix will be given by giving the...

Interactive periodic table with Tkinter & python

I have been trying to make an interactive periodic table using Tkinter & python3. However, on running the code, I don't get any output except a blank tkinter window. Can anyone point in the code...

Appending elements to a numpy nd array

I have initialized a numpy nd array like the following arr = np.zeros((6, 6)) This empty array is passed as an input argument to a function, def fun(arr): arr.append(1) # this works for arr...

Count Divisors of Product from L to R

I have been solving a problem but then got stuck upon its subpart which is as follows: Given an array of N elements whose ith element is A[i] and we are given Q queries of the type [L,R]. For...

How to generate an nd-array where values are greater than 1?

Is it possible to generate random numbers in an nd-array such the elements in the array are between 1 and 2 (The interval should be between 1 and some number greater than 1 )? This is what I...

NumPy Stack multidimensional arrays

I have 3 nD arrays as follows x = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] y = [[10, 11, 12], [13, 14, 15], [16, 17, 18]] z = [[ 19, 20, 21], [ 22, 23, 24], [...

dealing cards to players and updating dictionary with player:hand

I am trying to create a deck of cards, randomly shuffle it, and deal 3 cards to 3 players. I created a function buildDeck() that returns the 48 needed cards in deck as a list. I then tried to make...

Hexo cannot display "next" theme

Noob here. I want to build a personal blog using Hexo with theme next, but I met some problems (no problems with other themes, e.g. landscape). I typed hexo s -g Cmd line returns INFO Validating...

DSpace OAI-PMH XML Import

I am changing my OAI Data Provider from jOAI to DSpace. My expectation was that I could easily import the metadata, which is available as XML, into DSpace. But this seems not to be the case. I...

Efficient code for custom color formatting in tkinter python

So , I was trying to create a Periodic Table and its almost done from the exterior efficiently . However , I couldn't understand if there's any way I could fill in colors in individual buttons in...