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Writing data into CSV file in C#
...re the values
var allLines = (from trade in proposedTrades
select new object[]
{
trade.TradeType.ToString(),
trade.AccountReference,
trade.SecurityCodeType.ToString(),
trade.SecurityC...
Apply multiple functions to multiple groupby columns
... group. When aggregating, g will be a Series. Passing g.index to df.ix[] selects the current group from df. I then test if column C is less than 0.5. The returned boolean series is passed to g[] which selects only those rows meeting the criteria.
In [95]: cust = lambda g: g[df.loc[g.index]['C']...
How can I efficiently select a Standard Library container in C++11?
... },
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true,enableSnippets:true
});
}
});
...
How can I determine installed SQL Server instances and their versions?
...To do this...
At command line:
svrnetcn
In the enabled protocols list, select 'TCP/IP', then click properties. There is a check box for 'Hide server'.
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IIS Express Windows Authentication
...
and the <UseGlobalApplicationHostFile> option in the project file selects the default or solution-specific config file.
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Paste in insert mode?
... where register can be:
+ for the clipboard,
* for the X clipboard (last selected text in X),
" for the unnamed register (last delete or yank in Vim),
or a number of others (see :h registers).
Ctrl-R {register} inserts the text as if it were typed.
Ctrl-R Ctrl-O {register} inserts the text wit...
Getting “Lock wait timeout exceeded; try restarting transaction” even though I'm not using a transac
...heck your database transaction isolation level in the mysql cli:
mysql> SELECT @@GLOBAL.tx_isolation, @@tx_isolation, @@session.tx_isolation;
+-----------------------+-----------------+------------------------+
| @@GLOBAL.tx_isolation | @@tx_isolation | @@session.tx_isolation |
+----------------...
Differences between INDEX, PRIMARY, UNIQUE, FULLTEXT in MySQL?
...e - which are typically implemented internally using b-trees (allowing for selecting, sorting or ranges starting from left most column) or hash tables (allowing for selection starting from left most column).
Where the other index types are general-purpose, a FULLTEXT index is specialised, in that it...
Differences between detach(), hide() and remove() - jQuery
....empty()
The .empty() method removes all child nodes and content from the selected elements. This method does not remove the element itself, or its attributes.
Note
The .empty() method does not accept any argument to avoid memory leaks. jQuery removes other constructs, such as data and event hand...
Converting an array of objects to ActiveRecord::Relation
...e clause will generate a SQL statement with IN that looks something like:
SELECT .... WHERE `my_models`.id IN (2, 3, 4, 6, ....
Keep in mind that the ordering of the array will be lost - But since your objective is only to run a class method on the collection of these objects, I assume it won't b...