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Select first 4 rows of a data.frame in R
... character (matching the respective names):
df[row.index, column.index]
Read help(`[`) for more detail on this subject, and also read about index matrices in the Introduction to R.
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Bitwise operation and usage
...ion hardware. In this case, in order to find the frames, you will need to read the raw bytes in the file and try to find some kind of synchronization words, by scanning the data bit by bit. After identifying the synchronization words, you will need to get the actual frames, and SHIFT them if necess...
How to benchmark efficiency of PHP script
... a great tool for production and it's safe to run it there (as long as you read the instructions). The results of any one single page load aren't going to be as relevant as seeing how your code performs while the server is getting hammered to do a million other things as well and resources become sc...
Maven command to determine which settings.xml file Maven is using
... something like this:
...
[INFO] Error stacktraces are turned on.
[DEBUG] Reading global settings from c:\....\apache-maven-3.0.3\conf\settings.xml
[DEBUG] Reading user settings from c:\....\.m2\settings.xml
[DEBUG] Using local repository at C:\....\repository
...
(Original directory names are re...
How to extract img src, title and alt from html using php? [duplicate]
...exps :
<img[^>]+>
We apply it on all html web pages. It can be read as every string that starts with "<img", contains non ">" char and ends with a >.
(alt|title|src)=("[^"]*")
We apply it successively on each img tag. It can be read as every string starting with "alt", "title...
Encrypting & Decrypting a String in C# [duplicate]
... cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
var plainTextBytes = new byte[cipherTextBytes.Length];
var decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTe...
NOW() function in PHP
... be working and yours is also nice, but does not help, as the guy asking already knew a way how to do it, but wanted an easier, single-purpose function, which yours is not :)
– Asped
Jan 22 '15 at 11:24
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String.Empty versus “” [duplicate]
...e a lot of time thinking about it. Choose based on whatever you find more readable, or whatever convention is already being used in your project.
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How to use OpenSSL to encrypt/decrypt files?
... Do not use the above command since there is no key derivation. Read more here: openssl weak key derivation
– jonasl
Apr 29 '16 at 13:25
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Embedding DLLs in a compiled executable
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Wow - I thought I finally found it, then I read this comment. It seems to be gone totally. Are there any forks?
– Mafii
Oct 8 '16 at 16:19
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