Npoi simple read write Excel

What is NPOI? In short, NPOI can read and write Word or Excel documents without Office. Usage: 1. Prepare the dll file of NPOI Download link: https://npoi.codeplex.com/releases 2. Import the downloaded dll file into the project 3. Reference namespace       Notice: 1. Excel table is divided into: WorkBook - > sheet - > Row: Row ...

Posted on Fri, 22 Nov 2019 10:42:31 -0500 by MeanMrMustard

Simple priority queue implemented by golang

The following is a simple priority queue implemented by golang. For reference information, please refer to https://golang.org/pkg/container/heap/ or https://golang.google.cn/pkg/container/heap/, which is also an official website. For instructions on this page, please refer to https://blog.golang.org/hello-china. package queue import "cont ...

Posted on Fri, 22 Nov 2019 10:40:26 -0500 by mtorbin

CSS3 Transition & Animation

At present, there are two ways to use animation effect in CSS3:transition and animation 1.transitionMain attributes:Transition delay transition animation delay timeTransition duration transition animation durationTransition timing function: linar transition curve Example: <!DOCTYPE html> <html> <head> < ...

Posted on Fri, 22 Nov 2019 10:33:51 -0500 by irishjohnny24

Notes on machine learning -- iris classification

·Training and test data To verify the success of the model, we usually divide the collected labeled data into two parts: one is used to build machine learning model, which is called training data, and the other is used to test, which is called test data. The train ﹣ test ﹣ split function in scikit learn generally takes 75% of the data ...

Posted on Fri, 22 Nov 2019 10:30:29 -0500 by debigmac

Factory method of python design pattern factory pattern

python environment python==3.7.2 Brief introduction of factory method mode Factory Method, also known as polymorphism factory mode. In the Factory Method pattern, the core factory class is no longer responsible for the creation of all products, but the creation of specific work to the subclass to do. The core class becomes an ...

Posted on Fri, 22 Nov 2019 10:26:08 -0500 by border20

openCV+python for global threshold segmentation

Global threshold (also known as simple threshold)   As the name implies, the whole image adopts a threshold value. When the pixel value of a point is greater than the threshold value, a new value is given to the point, otherwise another value is given. The function cv2.threshold() is used.   cv2.threshold(src, thresh, maxva ...

Posted on Fri, 22 Nov 2019 10:20:11 -0500 by rtown

Java B date of the 8th Blue Bridge Cup

Java B date of the 8th Blue Bridge Cup Title: Date issue Xiao Ming is sorting out a batch of historical documents. There are many dates in these historical documents. Xiao Ming knows that these dates are from January 1, 1960 to December 31, 2059. What bothers Xiaoming is that the format of these dates is very different, There ...

Posted on Fri, 22 Nov 2019 10:20:40 -0500 by bogdan

Java8 [from nothing to have, from have to no], [F1] interface default method (flexibly adjust the changes between interface and implementation class)

1. introduction An interface can have an implementation method, without the need for an implementation class to implement its methods Purpose: to solve the problem that the interface modification is not compatible with the existing implementation The keyword default is used before the method return value in the interface 2. ...

Posted on Fri, 22 Nov 2019 10:12:34 -0500 by Mortier

Research on the source code of Chrome little dinosaur game

Preface Last article:< Research on the source code of Chrome little dinosaur game three -- enter the arcade mode >Realized opening animation and arcade mode. In this article, the random drawing of clouds will be realized. Cloud like cloud Define Cloud like Cloud: /** * Clouds * @param {HTMLCanvasElement} canvas canvas * @param {Object} ...

Posted on Fri, 22 Nov 2019 10:03:21 -0500 by welshy123

Efficiency comparison between mysql in and or

What I have seen on the Internet is that there is no difference between the efficiency of or and in, and I always feel that it is the same. I just read the article "36 military regulations for mysql database development" a few days ago, which mentioned the efficiency of or and in. The article mentioned that the efficiency of or is O(n ...

Posted on Fri, 22 Nov 2019 09:59:52 -0500 by bazza84