How to Make Python remember a list created inside a function for future use

Python
Below is an iterative calculation of Fibonacci Sequence. def fibonacci(n): if n < 0: raise ValueError("invalid index!") if n=...
3 years ago

Image transparency and alpha when merging images with PHP

PHP
So I found some code on PHP Doc, and edited it slightly to merge two images I have. The image is then saved in a folder on the server. However there i...
3 years ago

Python: Check whether list is sequential or not

Python
Want a function / statement, to check whether all the values of mylist are sequential or not, which is hexadecimal list. For example: def checkmylist...
3 years ago

Multiply specific columns of one matrix with specific columns of another matrix for many indices

R
I have two large matrices P and Q around (10k x 50k dim in both, but to test this yourself a random 10x10 matrix for P and Q is sufficient). I have a ...
3 years ago

Reset row selection for DT::renderDataTable() in Shiny R

R
I reproduced an example shiny app written by Yihui Xie (https://yihui.shinyapps.io/DT-rows/). The app uses DT::renderDataTable() which allows a row se...
3 years ago

Serving react-routes with Express

React JSX
I'm using react-router-dom and load components on rotes like this: <Switch> <Route exact path="/home" component={Home} /> ...
3 years ago

How to reference a composite primary key in SQL

SQL
I have created the following 3 tables using the following code. CREATE TABLE BUILDING( BUILDINGNO CHAR(2), BUILDINGWING VARCHAR2(15), BUILDINGLANE VA...
3 years ago

SQL joining tables and merging columns of different type

SQL
This may not be usual and probably is not good thing to do, but I would like to know if it is possible. So let's say I got two tables that look like t...
3 years ago

Swift button state info

Swift
the question is similar to "how to pass data from different viewController" but in this case i need another information, i know how to pass the data f...
3 years ago

CreateMeasurementGraphics issue

Vb.net
On a specific web server I'm taking the default printer and using it to create a device context for printing; I'm facing the following issue using Cre...
3 years ago

How i can find child in Firebase?

Android
I have a structure of Firebase database: DB -User --UID ----UsersMessages -------uniqueID -------textMessage -------typeOfMessage Code priva...
3 years ago

How to get control to other item in recyclerview?

Android
I have a horizontal recyclerView,when I clicked on each of the element,a LinearLayout inside it setVisibility(VISIBLE) ,this work fine. So what I wan...
3 years ago

Why aren't datepicker values assigning the form input a value

ASP.NET (C#)
I am having a similar if not the same problem as this question: Jquery datepicker selected date not assigning the value However the answer given is n...
3 years ago

How can multiple threads have the same thread ID?

C
I've got a question: can multiple threads have the same thread_id? (Of course not.) But my code is doing so. How is this possible? #include<stdio....
3 years ago

Spire.Doc, saving input overwrites previous input, windows forms

C#
I have a form that asks questions and you write an answer in a text box. When you hit 'next' or 'add' it should save the input and cycle like this unt...
3 years ago

Specified cast is not valid error when sql column is null or tinyint

C#
I have a DataTable that's filled with data from the database. And one of the column is either int or null. Int the DataBase the column appear under th...
3 years ago

Invoking a pure virtual method within a thread

C++
I have the requirement of invoking a pure virtual method implementation when spawning a thread from within a base class method as shown below. #inclu...
3 years ago

do I need a return after throwing exception (c++ and c#)

C++
I have a function that generate an exception. For example the following code: void test() { ifstream test("c:/afile.txt"); if(!test) { ...
3 years ago

Hide div when it's affected with parents 'overflow:hidden;'

CSS
I am working on dynamic timeline, parent element is pushing child elements 200px on every click, problem is that, because of design, there is no chanc...
3 years ago

Making a full height and width menu bar when pressing on button

CSS
I want to when I press a menu button on the top right, something slides from the left to the right full screen (full height and width) and everything ...
3 years ago