Programming #1
development embedded system
7/16/2023
11/15/2022
XMLHttpRequest JSON.parser 정리
>>ajax사용하는 방법 또는 XMLHttpRequest자바스크립트를 사용/
var xhr = new XMLHttpRequest();
//xhr.responseType = 'json';
xhr.open("GET", "t_01_01.do", true);
xhr.onload = function () {
if (this.readyState === 4 && this.status == 200)
{
// status 는 HTTP 통신의 결과를 의미
// 200 은 통신이 성공했다는 뜻
console.log(this.responseType); // 요청 반환 jsp 의 정확한 처리 필요.
console.log("succ... response Text [" + this.responseText + "]" );
//document.getElementById("result").innerHTML = this.responseText;
//var ob = jQuery.parseJSON(this.responseText);
//console.log(ob);
//var tempArr =
<%
//=helloWorld(<script> this.responseText </script>);
%>
var jjj = JSON.parse(this.responseText); // json 파싱.
var tempArr = [];
tempArr[0] = jjj[0]['n1'];
tempArr[1] = jjj[0]['n2'];
tempArr[2] = jjj[0]['n3'];
draw_refresh( tempArr );
}
10/02/2022
Kalman Filter c# UKF
>> 칼만필터.
class Program
{
static void Main(string[] args)
{
var filter = new UKF();
List<double> measurements = new List<double>();
List<double> states = new List<double>();
Random rnd = new Random();
for (int k = 0; k < 100; k++)
{
var measurement = Math.Sin(k * 3.14 * 5 / 180) + (double)rnd.Next(50) / 100;
measurements.Add(measurement);
filter.Update(new[] { measurement });
states.Add(filter.getState()[0]);
}
GraphPane myPane = new GraphPane(new RectangleF(0, 0, 3200, 2400), "Unscented Kalman Filter", "number", "measurement");
PointPairList measurementsPairs = new PointPairList();
PointPairList statesPairs = new PointPairList();
for (int i = 0; i < measurements.Count; i++)
{
measurementsPairs.Add(i, measurements[i]);
statesPairs.Add(i, states[i]);
}
myPane.AddCurve("measurement", measurementsPairs, Color.Red, SymbolType.Circle);
myPane.AddCurve("estimate", statesPairs, Color.Green, SymbolType.XCross);
Bitmap bm = new Bitmap(200, 200);
Graphics g = Graphics.FromImage(bm);
myPane.AxisChange(g);
Image im = myPane.Image;
im.Save("result.png", ImageFormat.Png);
}
}
9/29/2022
스프링부트
>> 11
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
--> build.gradle 항목에 JPA 또는 mysql driver 사용중인 경우에는
application.properties 항목에 db 연결 설정.
>>
Spring Web, Spring Data JPA, and MySQL Driver.
#spring.jpa.hibernate.ddl-auto=update # update 기본 부트 실행시 에러가 남. ( 관련 클래스 없이..)실행시
spring.jpa.hibernate.ddl-auto=none
#spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:3306/board
spring.datasource.url=jdbc:mysql://localhost:3306/board
spring.datasource.username=spring
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.show-sql=true
스르핑부트 초기 진입. --> 컨트롤러
>> phpmyadmin. root 암호.
디렉터리 phpmyadmin 아래의
config.inc.php
/* Authentication type and info */
$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = ''; /* root 암호 */
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['AllowNoPassword'] = true;
$cfg['Lang'] = '';