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PHP append one array to another (not array_push or +)
...m doc: If the input arrays have the same string keys, then the later value for that key will overwrite the previous one
– Dusan Plavak
Feb 5 '16 at 1:53
...
Is REST DELETE really idempotent?
...issues) the
side-effects of N > 0 identical
requests is the same as for a single
request. The methods GET, HEAD, PUT
and DELETE share this property. Also,
the methods OPTIONS and TRACE SHOULD
NOT have side effects, and so are
inherently idempotent. "
The key bit there is the side...
How can I apply a function to every row/column of a matrix in MATLAB?
You can apply a function to every item in a vector by saying, for example, v + 1 , or you can use the function arrayfun . How can I do it for every row/column of a matrix without using a for loop?
...
How are virtual functions and vtable implemented?
...ever a program has a virtual function declared, a v - table is constructed for the class. The v-table consists of addresses to the virtual functions for classes that contain one or more virtual functions. The object of the class containing the virtual function contains a virtual pointer that points ...
Read a file line by line assigning the value to a variable
...xt read from file: $line"
done < my_filename.txt
This is the standard form for reading lines from a file in a loop. Explanation:
IFS= (or IFS='') prevents leading/trailing whitespace from being trimmed.
-r prevents backslash escapes from being interpreted.
Or you can put it in a bash file h...
I need to store postal codes in a database. How big should the column be?
...
Good link. Even allowing for the punctuation in US ZIP+4, 10 characters would be enough for any country as far as I could tell.
– Jonathan Leffler
Nov 28 '08 at 5:36
...
How to randomize (shuffle) a JavaScript array?
...onally correct. In the Fisher-Yates algorithm, the loop isn't meant to run for the first element in the array. Check out wikipedia where there are other implementations that also skip the first element. Also check out this article which talks about why it is important for the loop not to run for the...
Arduino Sketch upload issue - avrdude: stk500_recv(): programmer is not responding
...s problem with a Crowduino, running the Arduino IDE on OS X. The solution for me was to switch on verbose output during upload (in the Arduino IDE preferences pane).
Then, when uploading, you can see AVRDUDE sending three packets avrdude: Send: 0 [30] [20] (with corresponding RX flashes on the b...
In Java, how do I convert a byte array to a string of hex digits while keeping leading zeros? [dupli
I'm working with some example java code for making md5 hashes. One part converts the results from bytes to a string of hex digits:
...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...e256[p[3]];
You can extend this idea to 64-bit ints, or trade off memory for speed (assuming your L1 Data Cache is large enough), and reverse 16 bits at a time with a 64K-entry lookup table.
Others
Simple
unsigned int v; // input bits to be reversed
unsigned int r = v & 1; // r will b...