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How do you calculate the average of a set of circular data? [closed]
...a[i]-x
c = subset of a where the correct (angular) difference (a[i]-360)-x
cn = size of c
d = subset of a where the correct (angular) difference (a[i]+360)-x
dn = size of d
y = sum((b[i]-x)^2) + sum(((c[i]-360)-b)^2) + sum(((d[i]+360)-c)^2)
= sum(b[i]^2 - 2*b[i]*x + x^2)
+ sum((c[i]-360)^2 - 2*(c...
BLE 接收BLE模块发来的信息 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...并显示呢 求指教ble 设备连接，发送数据到硬件请参考：https://bbs.tsingfun.com/thread-1844-1-1.html
读取ble数据并显示在App上请参考文档：https://www.fun123.cn/reference/ ... ml#RegisterForBytes
请先自行研究一下，如果遇到具体的问题，请再继...
Python equivalent of D3.js
...dated more recently. Though the examples are all static D3.
more info:
https://github.com/wrobstory/vincent
https://pypi.python.org/pypi/vincent/0.1.6
The graphs can be viewed in Ipython, just add this code
vincent.core.initialize_notebook()
Or output to JSON where you can view the JSON o...
Does Git publicly expose my e-mail address?
...
Millions of GitHub commit emails leaked
https://github.com/cirosantilli/all-github-commit-emails extracted from GitHub Archives https://www.githubarchive.org exports commit.
GitHub Archive gets data from GitHub's events API: https://developer.github.com/v3/activit...
create a trusted self-signed SSL cert for localhost (for use with Express/Node)
...server.js:
const express = require('express')
const app = express()
const https = require('https')
const fs = require('fs')
const port = 3000
app.get('/', (req, res) => {
res.send("IT'S WORKING!")
})
const httpsOptions = {
key: fs.readFileSync('./security/cert.key'),
cert: fs.readF...
App Inventor 2 网络微数据库你用对了吗？ - App Inventor 2 中文网 - 清泛...
...
下面推荐2个中文网站，体验差不多，网站如下：
https://tinywebdb.cn/ 经测试，单个键值的容量大小约为 64KB 字节，超过则会保存失败。
https://tinywebdb.appinventor.space/ 经测试，单个键值的容量大小约为 9000 字节（9KB），超...
DendritasMqtt 拓展：用于 websocket 的Mqtt扩展 - App Inventor 2 拓展 - ...
...应该是原始版本，支持原生的TCP协议，用最新版本即可：https://www.fun123.cn/reference/iot/MQTT.html
请自行通过demo研究。
参考来源：https://community.appinventor.mi ... -with-service/14365
https://groups.google.com/d/msg/ ... cn5PzY/Kg8BJEPGAQAJ
Get output parameter value in ADO.NET
...ad]
static void Main(string[] args)
{
using( SqlConnection cn = new SqlConnection("server=(local);Database=Northwind;user id=sa;password=;"))
{
SqlCommand cmd = new SqlCommand("CustOrderOne", cn);
cmd.CommandType=CommandType.StoredProcedure ;
SqlParam...
Select where count of one field is greater than one
...
I give an example up on Group By between two table in Sql:
Select cn.name,ct.name,count(ct.id) totalcity
from city ct left join country cn on ct.countryid = cn.id
Group By cn.name,ct.name
Having totalcity > 2
s...
XmlSerializer giving FileNotFoundException at constructor
...ation of serialization assemblies described below.
– Quarkly
Nov 22 '13 at 15:44
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