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How to correctly use the extern keyword in C
...
The definition is needed if you call the function at line 100 and instanciate it at line 500. Line 100 would declare undefined prototype. So, you add the prototype near the top.
– Christian Gingras
Apr 21 '18 at 19:23
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Is it possible to use argsort in descending order?
... equal items will get reversed).
Example timings:
Using a small array of 100 floats and a length 30 tail, the view method was about 15% faster
>>> avgDists = np.random.rand(100)
>>> n = 30
>>> timeit (-avgDists).argsort()[:n]
1.93 µs ± 6.68 ns per loop (mean ± std. d...
String concatenation in Ruby
... overrides the first object with the new object.
require 'benchmark'
N = 1000
BASIC_LENGTH = 10
5.times do |factor|
length = BASIC_LENGTH * (10 ** factor)
puts "_" * 60 + "\nLENGTH: #{length}"
Benchmark.bm(10, '+= VS <<') do |x|
concat_report = x.report("+=") do
str1 = ""
...
How to fix “Headers already sent” error in PHP
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+100
No output before sending headers!
Functions that send/modify HTTP headers must be invoked before any output is made.
summary ⇊
Ot...
多点触控使用指导 · App Inventor 2 中文网
...旋转；单指快速滑动在标签上显示方向：
global 基准宽 = 100
global 基准高 = 100
global 基准角 = 0
when 多点触控1.TouchDown(组件, 触摸点序号, x坐标, y坐标) {
if 多点触控1.PointerCount(画布1) == 2 {
基准宽 = 图像精灵1.Width
基准高 = ...
Detecting programming language from a snippet
...d to add language detection to code snippets for forum software. It worked 100% of the time, except in ambiguous cases:
print "Hello"
Let me find the code.
I couldn't find the code so I made a new one. It's a bit simplistic but it works for my tests. Currently if you feed it much more Python cod...
Java logical operator short-circuiting
... For example, consider the following statement:
if ( c==1 & e++ < 100 ) d = 100;
Here, using a single & ensures that the increment operation will be applied to e whether c is equal to 1 or not.
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Set background color of WPF Textbox in C# code
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100
If you want to set the background using a hex color you could do this:
var bc = new BrushConv...
optional parameters in SQL Server stored proc?
...ATE PROCEDURE MyProcName
@Parameter1 INT = 1,
@Parameter2 VARCHAR (100) = 'StringValue',
@Parameter3 VARCHAR (100) = NULL
AS
/* check for the NULL / default value (indicating nothing was passed */
if (@Parameter3 IS NULL)
BEGIN
/* whatever code you desire for a missing parameter*/
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python pandas remove duplicate columns
... the number of columns you can have. For me it failed for a dataframe with 100,000 rows for instance, as this yields 100,000 columns after transposing, which is not possible
– Eelco van Vliet
Mar 3 at 10:08
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