How Java, PHP, Python, JS and other developers draw statistical charts
Abstract: At present, many programmers basically use the back-end to generate data and pass it to the front-end, and then the front-end renders the data to the drawing library for display, so as to get the various results we finally saw. kind of graph, but sometimes we find that there is a lot of data that needs to be transferred. At this time, it is very slow to pass the data to the front end for analysis and display, so it is necessary to generate various statistical graphs on the back end, as follows Let’s talk about how various programmers make pictures? PHP programmers who have used PHP to create statistical charts should know that JqGraph is the golden partner of PHP. Using JqGraph we can complete the production of many charts, such as scatter charts, bar charts, line charts, stock charts, and pie charts. Wait, and the library currently supports PHP7, so we can use it with confidence. Currently, many programmers basically use the back-end to generate data and pass it to the front-end, and then the front-end renders the data to the drawing library for display, thereby obtaining the various pictures we finally see. But sometimes, we find…
How to choose among the five major programming languages: Java, Python, C++, PHP, and JavaScript
This article mainly introduces how to choose the five major programming languages of Java, Python, C++, PHP, and Javascript. It has certain reference value. Interested friends can refer to it. I hope that after reading this article There is a lot to gain, let the editor take you to understand it together. Before I help you solve this problem, let us first take a look at what these five languages are used for? This might help you make a decision faster! 1. Java What Java can do: App development for Android and IOS , video game development, desktop GUI, software development, etc.; Java has the characteristics of cross-platform, object-oriented, and generic programming. It is very popular among enterprises and is widely used in enterprise-level web application development and mobile applications. Application development. Java has developed to the present and is mainly divided into three major parts according to application: J2SE, J2ME, and J2EE. The three areas of application are different, but they complement each other. It is widely used in PCs, data centers, game consoles, scientific supercomputers, mobile phones and the Internet, and has a global developer professional community. Java has developed with the rapid development of the Internet and…
storm installation (2) Installation of ZeroMQ, JZMQ, Python, Java environment
2.ZeroMQ installation Copy the installation file zeromq-2.1.7.tar.gz to the home file path. Add permissions to files chmod +x /home/ zeromq-2.1.7.tar.gz unzip files tar -xzf /home/ zeromq-2.1.7.tar.gz Enter the file path to install cd /home/ zeromq-2.1.7 ./configure make sudo make install Installed （ An error uuid not found will be reported here. At this time, you need to install the util-linux-2.21.1.tar.gz file. Unzip it with the same installation steps, and then enter the decompressed folder ./configure –without-ncureses make sudo make install Then just install zeromq ） 3.JZMQ installation First enter the home path cd /home Download installation files git clone https://github.com/nathanmarz/jzmq.git Enter the jzmq file cd jzmq Install ./autogen.sh ./configure make sudo make install Installed 4.Python installation Copy the file to the home folder Enter the home folder cd /home Add permissions chmod +x Python-2.7.6.tgz unzip files tar zxvf Python-2.7.6.tgz Install cd Python-2.6.6 ./configure make make install After the installation is complete, test whether the installation is successful python -V Python 2.7.6 Installed 5. I have already installed the Java environment when building Hadoop before, so I won’t go into details here.
Top ten classic sorting algorithms – bubble sort (implemented in Java, JavaScript, PHP, Python, Go language)
One of the ten classic sorting algorithms – Bubble sort This article mainly introduces “bubble sort” among the top ten classic sorting algorithms, and attaches the Java, Javascript, PHP, Python, and Go language implementations of the bubble sort algorithm. 1. Introduction to the top ten classic sorting algorithms Sorting algorithms can be divided into internal sorting and external sorting. Internal sorting is to sort data records in memory, while external sorting is because the sorted data is very large and cannot accommodate all the sorted records at one time. Access is required during the sorting process. External storage. Common internal sorting algorithms include: Insertion sort, Hill sort, selection sort, bubble sort, merge sort, quick sort, heap sort, radix sort, etc. 2. Comparison of the top ten classic sorting algorithms Note: About time complexity 1. Square order (O(n2)) sorting Various types of simple sorting: direct insertion, direct selection and bubble sorting. 2. Linear logarithmic order (O(nlog2n)) sorting: quick sort, heap sort and merge sort. 3.O(n1+§)) sorting, § is a constant between 0 and 1. Hill sort. 4. Linear order (O(n)) sorting, radix sorting, in addition to bucket and bin sorting. Note: About stability Stability: the order of two equal key values…
Python, Java, GoLang Web-based performance testing
I have been studying the Go language recently, and the most mentioned one is the high performance & high concurrency of GoLang, so in line with the principle of no comparison, no harm, I am going to compare it with the other two I have mastered. A simple performance comparison of languages (Python, Java). Test environment My MacBook Pro, 12 logical CPUs + 16G memory Testing Tools https://github.com/wg/wrk wrk -t8 -c100 -d30s –latency http://www.baidu.com Simulate 8 threads, 100 concurrency, performance test lasting 30 seconds Implementation The complete source code of the following program has been placed on GitHub: https://github.com/Panmax/web-benchmark Python Framework: Flask Container: Gunicorn Operating environment: Docker Core code: # -*- coding: utf-8 -*- from flask import Flask app = Flask(__name__) @app.route(“/”) def hello(): return “Hello Python!” if __name__ == ‘__main__’: app.run() Dockerfile FROM ubuntu:14.04 ADD sources.list /etc/apt/sources.list ADD pip.conf ~/.pip/pip.conf #Update OS # RUN sed -i ‘s/# \(.*multiverse$\)/\1/g’ /etc/apt/sources.list RUN apt-get update RUN apt-get -y upgrade #InstallPython RUN apt-get install -y python-dev python-pip # Add requirements.txt ADD requirements.txt /webapp/requirements.txt #Install gunicorn Python web server RUN pip install gunicorn==19.6.0 #Install app requirements RUN pip install -r /webapp/requirements.txt # Create app directory ADD ./webapp # Set the default directory for our…
Wu Yuxiong’s artificial intelligence java, javascript, HTML5, python, oracle – implementation of a concise version of the WEB side review code of the intelligent medical system
import sys import os import time importoperator import cx_Oracle import numpy as np import pandas as pd import tensorflow as tf conn=cx_Oracle.connect(‘doctor/admin@localhost:1521/tszr’) cursor = conn.cursor() def printHistory(userid): sql = “select username,sex,age,province,area,bumen,ke,result,chufang,jianyi,yiyuaan,yisheng,jianchaxiang,zhenduanriqi from zhenduanjilutable where userid= ‘%d'” % userid cursor.execute(sql) rows = cursor.fetchall() zhenduanjilu = [] for row in rows: temp = [] temp.append(row[0]) temp.append(row[1]) temp.append(row[2]) temp.append(row[3]) temp.append(row[4]) temp.append(row[5]) temp.append(row[6]) temp.append(row[7]) temp.append(row[8]) temp.append(row[9]) temp.append(row[10]) temp.append(row[11]) temp.append(row[12]) temp.append(row[13]) zhenduanjilu.append(temp) print(“====================Print diagnostic history=== ==================”) for i in range(len(zhenduanjilu)): print(“————–>>No.: ” +str(i+1)+”Diagnosis<<——————- “) print(” Name: “+zhenduanjilu[i][0]) print(” Gender: “+zhenduanjilu[i][1]) print(” Age: “+str(zhenduanjilu[i][2 ])) print(” Province: “+zhenduanjilu[i][3]) print(” Urban area: “+zhenduanjilu[i][4] ) print(” Outpatient department: “+zhenduanjilu[i][5] ) print(” Outpatient subjects: “+zhenduanjilu[i][6] ) print(” Diagnosis result: “+zhenduanjilu[i][7] ) print(” Medical prescription: “+zhenduanjilu[i][8] ) print(” Health advice: “+zhenduanjilu[i][9] ) print(” Recommended hospital: “+zhenduanjilu[i][10] ) print(” Recommended doctor: “+zhenduanjilu[i][11] ) print(” Suggested check items: “+zhenduanjilu[i][12 ]) print(” Diagnosis date: “+str(zhenduanjilu[i][13])) # printHistory(6) <%– Document: ALSelectHistory Created on : 2018-10-9, 21:28:13 Author: acer –%> <%@page import=”java.util.Iterator “%> <%@page import=”java.util.ArrayList “%> <%@page import=”java.util.List “%> <%@page import=”java.io.InputStreamReader “%> <%@page import=”java.io.Bpan >> <h2>Please enter the number of the follow-up record you need: <input type=”text” name=”hisid” value= “”/></h2> <input type=”hidden” name=”userid” value=””/> <input type=”hidden” name=”username” value=””/> <input type=”hidden” name=”province” value=””/> <input type=”hidden” name=”administr”…
Scripting language Scripting language: Shell, JavaScript, VBScript, Perl, PHP, Python, Ruby, Lua
Today I have been studying issues such as scripting languages, and I just have the opportunity to share it with you this morning. Scripting language: Shell, Javascript, Vbscript, Perl, PHP, Python, Ruby, Lua Job control language and shell Shell script Such scripts are used for automated job control, i.e. starting and controlling the behavior of system programs. Most scripting language interpreters are also command line interfaces, such as Unix shell and MS-DOS command. Others, such as AppleScript, can add a scripting environment to the system, but there is no command line interface. Detailed categories include: 1.4NT 2.AppleScript 3.ARexx(Amiga Rexx) 4. bash 5.csh 6. DCL 7. JCL 8.ksh 9.Cmd.exe batch(Windows, OS/2) 10.command batch(DOS) 11. REXX 12. tcsh 13.sh 14.Winbatch 15. Windows PowerShell 16.Windows Script Host 17. zsh GUI script GUI emergence brings a professional scripting language for controlling computers. It interacts between the user and the graphical interface, menus, buttons, etc. It is often used to automate repetitive actions, or to set a standard state. In theory it can be used to control all applications running on a GUI-based computer, but in fact whether these languages are supported depends on the application and the operating system itself. When interacting…
gopythonjavascala_[Transfer] Comparison of R, Python, Java, and Scala Go Language Chinese Community
Data Science，An exciting field just thinking about it，combines the most beautiful statistical knowledge with programming ability through different wisdom，a 1+1>2 field，and all the developments this year indicate that the glorious day of data science has arrived，whether it is big data,artificial intelligence,deep learning or data analysis， All are inseparable from data science. Data science is widely used in various fields，All programming languages are also accepting data science，So what is the best data science？ Although there is no absolute Answer，But there are a few things to consider，After all, becoming a data scientist depends on many aspects： 1. Applicability In In data science we talked about, “if you want to go further”, it’s obviously not feasible to reinvent the wheel every time. It is necessary to learn and master the various software packages and tools provided in the chosen language – and a language with broad applicability and many packages will be a good choice. 2. Speed In the often fast-paced world of commercial data science ， it is necessary to complete a job quickly，therefore， The speed of technology is taken into consideration – not only the speed of operation – but also the speed of learning. 3. Performance In some cases, it…
Which one is faster, C++, Java, Python, or Fortran?
In the article “C” is 2.1% faster than Java – Comparison of experimental data from calculating prime numbers within 1 million”, C” and Java are compared Speed - Now use the same method to compare the speed of python and fortran by counting prime numbers within 1,000,000. Python code import time import datetime t =time.time() #print(int(round(t * 1000))) i=2 j=2 for i inrange(2,1000000): for j in range(2, (int(i/j)+2) ): #print(i,”*”,j,(int(i/j)+1) ) if(i%j==0): #print(i,j,” **”) break # if(j >int (i/j)): #print(i) t1 =time.time () print(int(round(t1 * 1000))-int(round(t * 1000)) ,”********** ” ) ######################################## ！！！！！！！！！！！ #xff01;！！！！！！！ ;！ fortran code program main implicit none integer::i,j Real :: r1 = 0.0 Real :: r2 = 0.0 p> Real :: r3 = 0.0 Real :: r4 = 0.0 Real :: : ra1 = 0.0 Real :: ra2 = 0.0 Real :: ra3 = 0.0 Real :: ra4 = 0.0 character(8)::date character(10)::time character(5 )::zone integer,dimension(8)::values character(8)::datea character( 10)::timea character(5)::zonea integer,dimension(8)::valuesa ! using keywordarguments calldate_and_time(date,time,zone,values) calldate_and_time(DATE=date,ZONE=zone) calldate_and_time(TIME& #61;time) calldate_and_time(VALUES=values) print '(a,2x,a,2x,a) ',date,time,zone print '(8i5))',values outer: do i& #61;2,1000000 inner:do j=2, i/j !print “(3i5)”, i/j ,i,j if( j*(i/j)==i)then end if end do inner if(j > (i/j)) then print “(3i10)”,i endif end do outer calldate_and_time(datea,timea,zonea,valuesa) calldate_and_time(DATE=datea,ZONE& #61;zonea)…
leetcode2017. Grid game (C++, java, python)
Give you a two-dimensional array with subscripts starting from 0 grid ，The size of the array is 2 x n ， Where grid[r][c] represents the number of points at the (r, c) position in the matrix. Two robots are currently participating in a game on the Matrix. The initial positions of both robots are (0, 0) ，The target position is (1, n-1). Each robot will only move right ((r, c) to (r, c + 1)) or Down ((r, c) to (r + 1, c)) . The game starts，The first robot moves from (0, 0) to (1, n-1) ，And collect all points of the cells on the path. For all cells on the path (r, c) ，After passing through, grid[r][c] will be reset to 0 . Then ，the second robot moves from (0, 0) to (1, n-1) ，Similarly Collect all points of units on the path. Note that their paths may intersect. The first robot wants to defeat its competitors ， minimize the points collected by the second robot strong>. In contrast, the second robot wants to maximize the points it has collected. On the premise that both robots have performed to their best level， return the points <em collected by…
