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How to find all occurrences of an element in a list?
...umpy really shines for this sort of thing:
import numpy as np
values = np.array([1,2,3,1,2,4,5,6,3,2,1])
searchval = 3
ii = np.where(values == searchval)[0]
returns:
ii ==>array([2, 8])
This can be significantly faster for lists (arrays) with a large number of elements vs some of the other ...
How do I properly compare strings in C?
...
You can't compare arrays directly like this
array1==array2
You should compare them char-by-char; for this you can use a function and return a boolean (True:1, False:0) value. Then you can use it in the test condition of the while loop.
Try...
Why does a RegExp with global flag give wrong results?
...r expression match of string
against the regular expression and
returns an Array object containing the
results of the match, or null if the
string did not match The string
ToString(string) is searched for an
occurrence of the regular expression
pattern as follows:
Let R be this RexExp object.
Let...
Does pandas iterrows have performance issues?
...ically typed language, so there is runtime overhead for each element in an array. However, Numpy (and thus pandas) perform calculations in C (often via Cython). The type of the array is determined only at the start of the iteration; this savings alone is one of the biggest wins.
Better caching: Iter...
How does this milw0rm heap spraying exploit work?
... lot of nop instructions before it and jump to somewhere there. The memory array will hold the actual x86 code along with the jumping mechanism. We'll feed the crafted XML to the library which has a bug. When it's being parsed, the bug will cause the instruction pointer register to be assigned to so...
What are the differences between Rust's `String` and `str`?
...g's data.
On the stack: e.g. the following creates a stack-allocated byte array, and then gets a view of that data as a &str:
use std::str;
let x: &[u8] = &[b'a', b'b', b'c'];
let stack_str: &str = str::from_utf8(x).unwrap();
In summary, use String if you need owned string...
jQuery Ajax POST example with PHP
...ant to send a value back to the success of the Ajax below
echo json_encode(array('returned_val' => 'yoho'));
And then you can get it like:
ajaxRequest.done(function (response){
alert(response);
});
There are a couple of shorthand methods. You can use the below code. It does the same ...
How to get JSON objects value if its name contains dots?
I have a very simple JSON array (please focus on "points.bean.pointsBase" object):
5 Answers
...
Determine the number of lines within a text file
...hich lazily enumerates lines rather than greedily reading them all into an array like ReadAllLines. So now you can have both efficiency and conciseness with:
var lineCount = File.ReadLines(@"C:\file.txt").Count();
Original Answer
If you're not too bothered about efficiency, you can simply writ...
Single quotes vs. double quotes in C or C++
...a string literal containing an 'a' and a null terminator (that is a 2 char array).
In C++ the type of a character literal is char, but note that in C, the type of a character literal is int, that is sizeof 'a' is 4 in an architecture where ints are 32bit (and CHAR_BIT is 8), while sizeof(char) is 1...