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What is more efficient? Using pow to square or just multiply it with itself?
...second parameter to pow is an int, then the std::pow(double, int) overload from <cmath> will be called instead of ::pow(double, double) from <math.h>.
This test code confirms that behavior:
#include <iostream>
namespace foo
{
double bar(double x, int i)
{
std::c...
Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...nolog
SQL> conn / as sysdba
SQL> startup
查看数据库状态
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
READ WRITE
查看数据库字符集
SQL> select userenv('language') from dual;
SQL> select * from props$ where name='NLS_CHARACTERSET';
SQL> select * ...
Should I put input elements inside a label element?
...he first example given here by superUntitled for textboxes, textareas, and selects. But for radio buttons and checkboxes, I usually use the third example, where I want the input before the accompanying text and don't want the same kind of fixed width and/or floating that the rest of the labels and f...
Finding local maxima/minima with Numpy in a 1D numpy array
...s taken from the documentation itself.
Using the height argument, one can select all maxima above a certain threshold (in this example, all non-negative maxima; this can be very useful if one has to deal with a noisy baseline; if you want to find minima, just multiply you input by -1):
import matp...
Is there a way to detect if an image is blurry?
...k of a way to tell if such a smooth area is "blurry", or to distinguish it from an out-of-focus area. You should ask this as a separate question (maybe on DSP.SE). Maybe someone else has better ideas.
– Niki
Nov 2 '12 at 8:28
...
Why isn't `int pow(int base, int exponent)` in the standard C++ libraries?
...s based, also had no use for powers (it didn't have floating point at all, from memory).
As an aside, an integral power operator would probably have been a binary operator rather than a library call. You don't add two integers with x = add (y, z) but with x = y + z - part of the language proper ...
How can I trim all strings in an Array? [duplicate]
...
exp: array('a'=>' A', 'b'=>' B ', 'c'=>array(0=>'2')); it will return array('a'=>' A', 'b'=>' B ', 'c'=>null)
– Imran Khan
Jun 17 '14 at 10:49
...
windows异常处理 __try __except - C/C++ - 清泛网 - 专注C/C++及内核技术
...CEPTION_POINTERS结构如下，
typedef struct _EXCEPTION_POINTERS { // exp
PEXCEPTION_RECORD ExceptionRecord;
PCONTEXT ContextRecord;
} EXCEPTION_POINTERS;
其中EXCEPTION_RECORD类型，它记录了一些与异常相关的信息；而CONTEXT数据结构体中记录了异常发生时，...
When to use ' (or quote) in Lisp?
...WITH-STRING (LENGTH STRING))
Hey! That's not what we wanted. We want to selectively evaluate some arguments, and leave the others as symbols. Try #2!
(defun mess-with (number string)
(list 'value-of-number (1+ number) 'something-with-string (length string)))
Lisp> (mess-with 20 "foo")
(VAL...
Why is __dirname not defined in node REPL?
From the node manual I see that I can get the directory of a file with __dirname , but from the REPL this seems to be undefined. Is this a misunderstanding on my side or where is the error?
...