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'float' vs. 'double' precision
...n't doubles
have 14 significant figures?
The encoding of a double uses 64 bits (1 bit for the sign, 11 bits for the exponent, 52 explicit significant bits and one implicit bit), which is double the number of bits used to represent a float (32 bits).
...
Best way in asp.net to force https for an entire site?
...Startup.cs
app.UseHpkp(options => options
.Sha256Pins(
"Base64 encoded SHA-256 hash of your first certificate e.g. cUPcTAZWKaASuYWhhneDttWpY3oBAkE3h2+soZS7sWs=",
"Base64 encoded SHA-256 hash of your second backup certificate e.g. M8HztCzM3elUxkcjR2S5P4hhyBNf6lHkmjAHKhpGPWE=")
...
Pandas selecting by label sometimes return Series, sometimes returns DataFrame
...0
2 11
3 12
3 13
------- df.loc[2] --------
0 11
Name: 2, dtype: int64
type(df.loc[1]) : <class 'pandas.core.series.Series'>
--------- df[0] ----------
2 11
3 12
3 13
Name: 0, dtype: int64
type(df[0]) : <class 'pandas.core.series.Series'>
So, there is no sense to pre...
How to check if command line tools is installed
...n irrespective of what macOS version is
$brew config
macOS: 10.14.2-x86_64
CLT: 10.1.0.0.1.1539992718
Xcode: 10.1
This when you have Command Line tools properly installed and paths set properly.
Earlier i got output as below
macOS: 10.14.2-x86_64
CLT: N/A
Xcode: 10.1
CLT was shown as N/A in ...
Custom HTTP Authorization Header
...ols.ietf.org/html/draft-ietf-httpbis-p7-auth-16#section-2.3.1 says, "The "b64token" notation was introduced for compatibility with existing authentication schemes and can only be used once per challenge/credentials. New schemes thus ought to use the "auth-param" syntax instead, because otherwise fu...
Map function in MATLAB?
...rrayfun(@(x) x^2, 1:10)
y =
1 4 9 16 25 36 49 64 81 100
There are two other built-in functions that behave similarly: cellfun (which operates on elements of cell arrays) and structfun (which operates on each field of a structure).
However, these functions are oft...
C++11 tuple 这一篇就够了 - C/C++ - 清泛网 - 专注C/C++及内核技术
...个元素类型都可以不相同,这与其他容器有着本质的区别 是对pair的泛化。首先来介绍元组的 tuple元组定义了一个有固定数目元素的容器,其中的每个元素类型都可以不相同,这与其他容器有着本质的区别.是对pair的泛化。
首先来...
php：获取数组第一个值 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...始，即$arr[0]取数组第一个值。不过为了兼容性，建议还是采取reset(),current(),next()等函数来取数组中的值，reset($arr)后current($arr)取第一个值。自PHP 5.4版本后可以使用 [ ] 来取数据指定位置的元素，索引从0开始，即$arr[0]取数组第一...
【解决】jekyll 3.8.5 | Error: invalid byte sequence in UTF-8 - Python...
原因很简单，就是某个文件中混入了非UTF8字符，请仔细检查一定能发现的，可以采用排除法，文件逐个放入测试，就能找到具体的错误格式的文件。当然，也可能是文件名中含有非预期字符导致的报错！
非常感谢你的帮助！ ...
Installing MSBuild 4.0 without Visual Studio 2010
...2-bit:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
For 64-bit:
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
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