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How to combine multiple conditions to subset a data-frame using “OR”?
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my.data.frame <- subset(data , V1 > 2 | V2 < 4)
An alternative solution that mimics the behavior of this function and would be more appropriate for inclusion within a function body:
new.data <- data[ which( data$V1 > 2 | data$V2 &...
Why isn't String.Empty a constant?
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OO Design in Rails: Where to put stuff
...ng one or more methods within a class that operate on a clearly-defined subset of its attributes is one way to try identifying classes that might be refactored out of your ActiveRecord-derived model.
Rails models don't have to be subclasses of ActiveRecord::Base, by the way. Or to put it another w...
Are PHP functions case sensitive?
...g is that if the change is ever made, case-sensitivity would be an option, set in php.ini. Thus preserving backwards compatibility.
– ToolmakerSteve
Aug 17 '14 at 5:48
add a ...
Check if a value is in an array (C#)
...g[] printer = {"jupiter", "neptune", "pangea", "mercury", "sonic"};
PrinterSetup(printer);
// redefine PrinterSetup this way:
public void PrinterSetup(string[] printer)
{
foreach (p in printer.Where(c => c == "jupiter"))
{
Process.Start("BLAH BLAH CODE TO ADD PRINTER VIA WINDOWS ...
GridCtrl 控件FAQ - C/C++ - 清泛网 - 专注C/C++及内核技术
...中添加如下代码：
//设置控件类似于ListCtrl的表现
m_Grid.SetListMode(TRUE);
//设置控件的初始行数和列数
m_Grid.SetRowCount(1);
m_Grid.SetColumnCount(4);
//设置控件背景颜色，这里GetDefaultCell的两个参数分别表示是否是固定行或者是固...
How to return a string value from a Bash function
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@Evi1M4chine, um...no, you can't. You can set a global variable and call it "return", as I see you do in your scripts. But then that is by convention, NOT actually tied programmatically to the execution of your code. "clearly a better way"? Um, no. Command substi...
How to check if a process is running via a batch script
... file. At the end I could find a fairly simple solution, so I share it...
SETLOCAL EnableExtensions
set EXE=myprog.exe
FOR /F %%x IN ('tasklist /NH /FI "IMAGENAME eq %EXE%"') DO IF %%x == %EXE% goto FOUND
echo Not running
goto FIN
:FOUND
echo Running
:FIN
This is working for me nicely...
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SQLAlchemy: print the actual query
...es, such as ints and strings, and furthermore if a bindparam
without a pre-set value is used directly, it won't be able to
stringify that either.
To support inline literal rendering for types not supported, implement
a TypeDecorator for the target type which includes a
TypeDecorator.process_literal_...
C# Set collection?
Does anyone know if there is a good equivalent to Java's Set collection in C#? I know that you can somewhat mimic a set using a Dictionary or a HashTable by populating but ignoring the values, but that's not a very elegant way.
...