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How to estimate how much memory a Pandas' DataFrame will need?
...718016/1024/1024 = 392.6, so df.info(memory_usage="deep") may use 2^10 to convert byte to MB, which makes me confused. Thanks for your help anyway :D.
– Catbuilts
Oct 30 '18 at 4:01
...
Timer function to provide time in nano seconds using C++
...e for the clock period. This constant only comes into play if you want to convert the number of clock ticks into some real-time unit such as nanoseconds. And in that case, the more accurate you are able to supply the clock speed, the more accurate will be the conversion to nanoseconds, (millisecon...
Sql query to insert datetime in SQL Server
...f you are married to the dd-mm-yy hh:mm:ss xm format, you will need to use CONVERT with the specific style.
insert into table1 (approvaldate)
values (convert(datetime,'18-06-12 10:34:09 PM',5));
5 here is the style for Italian dates. Well, not just Italians, but that's the culture it's attr...
c++ 写日志通用类，可设置日志级别 - C/C++ - 清泛网 - 专注C/C++及内核技术
...e LEVEL_INFO 3
#define LEVEL_VERBOSE 4
#define LEVEL_DEBUG 5
static int nLoggerLevel = LEVEL_INFO;
void SetLoggerLevel(int nLevel);
void Log(int nLevel, LPCSTR func, INT line, LPCTSTR fmt, ...);
static const char * const LOGGER_LEVEL_NAME[] = {"崩溃", "错误", "警告", "信息", "详...
TSQL - Cast string to integer or return default value
...
If you are on SQL Server 2012 (or newer):
Use the TRY_CONVERT function.
If you are on SQL Server 2005, 2008, or 2008 R2:
Create a user defined function. This will avoid the issues that Fedor Hajdu mentioned with regards to currency, fractional numbers, etc:
CREATE FUNCTION dbo.T...
In-memory size of a Python structure
... sys
>>> import decimal
>>>
>>> d = {
... "int": 0,
... "float": 0.0,
... "dict": dict(),
... "set": set(),
... "tuple": tuple(),
... "list": list(),
... "str": "a",
... "unicode": u"a",
... "decimal": decimal.Decimal(0),
... "objec...
Maximum value for long integer
How can I assign the maximum value for a long integer to a variable, similar, for example, to C++'s LONG_MAX .
7 Answers
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varbinary to string on SQL Server
How to convert a column value from varbinary(max) to varchar in human-readable form?
7 Answers
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What do 'real', 'user' and 'sys' mean in the output of time(1)?
...up in the jump table; the kernel has a finite number of controlled entry points.
The 'system' calls in the C library (particularly those described in Section 2 of the man pages) have a user-mode component, which is what you actually call from your C program. Behind the scenes, they may issue one o...
Representing and solving a maze given an image
...
Here is a solution.
Convert image to grayscale (not yet binary), adjusting weights for the colors so that final grayscale image is approximately uniform. You can do it simply by controlling sliders in Photoshop in Image -> Adjustments -> B...