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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
... OCR 图片文字识别全方案总结
【FTP】App Inventor 2 FTP 上传下载全方案总结
【手机管理器】App Inventor 2 TaifunTM拓展：获取本机手机号码
【AI模型】Personal Image Classifier (PIC) 拓展：自行训练AI图像识别模型，开发图像识别分类App
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How to make shallow git submodules?
... if you put branch = mybranch on the .gitmodules as well.
Git 2.20 (Q4 2018) improves on the submodule support, which has been updated to read from the blob at HEAD:.gitmodules when the .gitmodules file is missing from the working tree.
See commit 2b1257e, commit 76e9bdc (25 Oct 2018), and comm...
Encrypt & Decrypt using PyCrypto AES 256
... base64
import hashlib
from Crypto import Random
from Crypto.Cipher import AES
class AESCipher(object):
def __init__(self, key):
self.bs = AES.block_size
self.key = hashlib.sha256(key.encode()).digest()
def encrypt(self, raw):
raw = self._pad(raw)
iv = Ran...
wget/curl large file from google drive
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Unfortunately that doesn't work any longer as of 2018.
– Calimo
Feb 13 '18 at 8:56
3
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程序员之网络安全系列（三）：数据加密之对称加密算法 - 更多技术 - 清泛网...
...一块数据用三个不同的密钥进行三次加密，强度更高。
AES（Advanced Encryption Standard）：高级加密标准，是下一代的加密算法标准，速度快，安全级别高；
RC4，也是为 RSA Data Security, Inc. 开发的密码系统的商标名称。
传统的DES...
How to add texture to fill colors in ggplot2
...friendly. So mabe something like this will work for you?
ggplot(diamonds, aes(x=cut, y=price, group=cut))+
geom_boxplot(aes(fill=cut))+scale_fill_brewer(palette="OrRd")
in this case OrRd is a palette found on the colorbrewer webpage: http://colorbrewer2.org/
Photocopy Friendly: This indicates...
Android encryption / decryption using AES [closed]
... a good example of how to encrypt and decrypt image and other files with AES on Android?
11 Answers
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AES vs Blowfish for file encryption
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Probably AES. Blowfish was the direct predecessor to Twofish. Twofish was Bruce Schneier's entry into the competition that produced AES. It was judged as inferior to an entry named Rijndael, which was what became AES.
Interesting as...
Comparison of DES, Triple DES, AES, blowfish encryption for data
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Use AES.
In more details:
DES is the old "data encryption standard" from the seventies. Its key size is too short for proper security (56 effective bits; this can be brute-forced, as has been demonstrated more than ten years a...
Scatterplot with too many points
... in ggplot2:
df <- data.frame(x = rnorm(5000),y=rnorm(5000))
ggplot(df,aes(x=x,y=y)) + geom_point(alpha = 0.3)
Another convenient way to deal with this is (and probably more appropriate for the number of points you have) is hexagonal binning:
ggplot(df,aes(x=x,y=y)) + stat_binhex()
And ...