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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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数据
对每个块的纠错码
1
1
67 85 70 134 87 38 85 194 119 50 6 18 6 103 38
213 199 11 45 115 247 241 223 229 248 154 117 154 111 86 161 111 39
2
246 246 66 7 118 134 242 7 38 86 22 198 199 146 6
87 204 96 60 202 182 124 157 200 134 27 129 209 17 163 163...
Colors in JavaScript console
...hsl(1258.2, 100%, 50%), 52px 234px hsl(1263.6, 100%, 50%), 53px 235px hsl(1269, 100%, 50%), 54px 236px hsl(1274.4, 100%, 50%), 55px 237px hsl(1279.8, 100%, 50%), 55px 238px hsl(1285.2, 100%, 50%), 56px 239px hsl(1290.6, 100%, 50%), 57px 240px hsl(1296, 100%, 50%), 57px 241px hsl(1301.4, 100%, 50%), ...
Extracting numbers from vectors of strings
...gexpr puts it between Andrew's and Arun's solutions (second fastest) on a 1e6 set. Perhaps also interesting, using sub in Andrew's solution does not improve the speed.
– Matthew Lundberg
Jan 27 '13 at 16:42
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How to correct TypeError: Unicode-objects must be encoded before hashing?
...dbits(256)).encode('utf-8')).hexdigest()
'cd183a211ed2434eac4f31b317c573c50e6c24e3a28b82ddcb0bf8bedf387a9f'
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Linux反编译全攻略 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...D9F 81 C6 04 00 00 00 add esi, 0x4
08048DA5 E2 E6 loop 08048D8D ; (near 0xE6)
08048DA7 BE 8F A0 04 08 mov esi, " cracked ohh yeah !!" (0804A08F)
08048DAC E8 42 00 00 00 call Fun...
How does this giant regex work?
...5\x36\x34\x5F\x64\x65\x63\x6F\x64\x65\x28
is acutally:
eval(gzinflate(base64_decode(
This is the code will print out the source code for this backdoor. However i would not execute the resulting PHP code, unless it is on a disposable virtual machine.
<?php
print gzinflate(base64_decode("7b...
Format floats with standard json module
...o, '.2f')
print(json.dumps(23.67))
print(json.dumps([23.67, 23.97, 23.87]))
emits:
23.67
[23.67, 23.97, 23.87]
as you desire. Obviously, there should be an architected way to override FLOAT_REPR so that EVERY representation of a float is under your control if you wish it to be; but unfortunat...
How to make a great R reproducible example
...thing on larger objects, you can try
my.df2 <- data.frame(a = sample(10e6), b = sample(letters, 10e6, replace = TRUE))
If you're working with spatial data via the raster package, you can generate some random data. A lot of examples can be found in the package vignette, but here's a small nugge...
Arduino101（Genuino 101）&App Inventor – RGB LED控制 - 创客硬件开...
繁体中文原文：https://blog.cavedu.com/2017/02/ ... %e6%8e%a7%e5%88%b6/
本文將介紹如何取得觸碰點的 RGB 參數之後透過 BLE 送給 Arduino 101 來點亮 RGB LED。
App InventorDesigner使用 Canvas 來取得觸碰點座標。兩個連線斷線用的按鈕：Btn_Connect /&n...
Android phone orientation overview including compass
... 'degrees' from the compass seem to run from 0-275 (going clockwise) above 269 ( between west and north) it counts backwards from -90 to 0, then forwards from 0 to 269. 270 becomes -90
Still In landscape but with the device lying on its back my sensor gives 0-360.
and in portrait mode it runs 0-360...