大约有 15,000 项符合查询结果（耗时：0.0256秒） [XML]
Mapping two integers to one, in a unique and deterministic way
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You're looking for a bijective NxN -> N mapping. These are used for e.g. dovetailing. Have a look at this PDF for an introduction to so-called pairing functions. Wikipedia introduces a specific pairing function, namely the Cantor pairing function:
Thr...
How can I add additional PHP versions to MAMP
...rent version of MAMP that I have only has php 5.2.17 and 5.4.4. I need 5.3.X. Is there a way to add additional versions that can be selected in the MAMP interfaces php preferences? This is for the free version of MAMP, not MAMP PRO.
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PDO Prepared Inserts multiple rows in single query
...ues Insert with PDO Prepared Statements
Inserting multiple values in one execute statement. Why because according to this page it is faster than regular inserts.
$datafields = array('fielda', 'fieldb', ... );
$data[] = array('fielda' => 'value', 'fieldb' => 'value' ....);
$data[] = array('...
What is the difference between Step Into and Step Over in the Eclipse debugger?
...llowing code with your current instruction pointer (the line that will be executed next, indicated by ->) at the f(x) line in g(), having been called by the g(2) line in main():
public class testprog {
static void f (int x) {
System.out.println ("num is " + (x+0)); // <- STEP INTO...
MySQL Data - Best way to implement paging?
... two numeric arguments, which must both be nonnegative integer constants (except when using prepared statements).
With two arguments, the first argument specifies the offset of the first row to return, and the second specifies the maximum number of rows to return. The offset of the initial row is 0 ...
Responsive image map
I have an existing image map in a responsive html layout. Images scale according to browser size, but the image coordinates are obviously fixed pixel sizes. What options do I have to resize the image map coordinates?
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Unpacking array into separate variables in JavaScript
...mple problem, and I've done it before. I just can't remember how, or what exactly it was called.
7 Answers
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Python convert tuple to string
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Use str.join:
>>> tup = ('a', 'b', 'c', 'd', 'g', 'x', 'r', 'e')
>>> ''.join(tup)
'abcdgxre'
>>>
>>> help(str.join)
Help on method_descriptor:
join(...)
S.join(iterable) -> str
Return a string which is the concatenation of the strings i...
Arguments or parameters? [duplicate]
...ngs passed as parameters.
void foo(int bar) { ... }
foo(baz);
In this example, bar is a parameter for foo. baz is an argument passed to foo.
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Ruby: How to get the first character of a string
...l as about everybody else who would like to learn from that question. For example, Mac OS X comes bundled with Ruby 1.8, so no installation is required for these users.
– Marc-André Lafortune
Apr 28 '10 at 17:11
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