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Nearest neighbors in high-dimensional data?
...
First, the number of features (columns) in a data set is not a factor in selecting a distance metric for use in kNN. There are quite a few published studies directed to precisely this question, and the usual bases for comparison are:
the underlying statistical
distribution of your data;
the rel...
SQL Server Text type vs. varchar data type [closed]
...ts in your database
If you do not search on the value of the column
If you select this column rarely and do not join on it.
VARCHAR is good:
If you store little strings
If you search on the string value
If you always select it or use it in joins.
By selecting here I mean issuing any queries that ...
完美解决phpcms批量移动内容后，新闻心情、评论排行等不更新的问题 - 更多...
... if(!$_POST['tocatid']) showmessage(L('please_select_target_category'));
$tocatid = intval($_POST['tocatid']);
$modelid = $this->categorys[$tocatid]['modelid'];
if(!$modeli...
How to bind RadioButtons to an enum?
..., Converter={StaticResource enumBooleanConverter}, ConverterParameter=FirstSelection}">first selection</RadioButton>
<RadioButton IsChecked="{Binding Path=VeryLovelyEnum, Converter={StaticResource enumBooleanConverter}, ConverterParameter=TheOtherSelection}">the other selection&...
The maximum recursion 100 has been exhausted before statement completion
...@EntDt = '12/31/2009';
declare @dcnt int;
;with DateList as
(
select @STARTDATE DateValue
union all
select DateValue + 1 from DateList
where DateValue + 1 < convert(VARCHAR(15),@EntDt,101)
)
select count(*) as DayCnt from (
select DateValue,...
SQL Server String or binary data would be truncated
...ur source query and execute Max(Len( source col )) on each column. I.e.,
Select Max(Len(TextCol1))
, Max(Len(TextCol2))
, Max(Len(TextCol3))
, ...
From ...
Then compare those lengths to the data type lengths in your destination table. At least one, exceeds its destination column leng...
IIS Express Immediately shutting-down running site after stopping web application
...debugging is stopped.
Right click your project > click Properties > select the 'Web' tab on the left > uncheck the Enable Edit and Continue checkbox.
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What are “first class” objects?
...es.
In Java, for example, there are primitive types (int, bool, double, char) that aren't proper objects. That's why Java has to introduce Integer, Boolean, Double, and Character as first-class types. This can be hard to teach to beginners -- it isn't obvious why both a primitive type and a cla...
Rails: Using greater than/less than with a where statement
...s behavior.
User.where(id: 201..Float::INFINITY)
will generate the SQL
SELECT `users`.* FROM `users` WHERE (`users`.`id` >= 201)
The same can be done for less than with -Float::INFINITY.
I just posted a similar question asking about doing this with dates here on SO.
>= vs >
To avo...
What is in your Mathematica tool bag? [closed]
...pplication of Reap and Sow which mimics/extends the behavior of GatherBy:
SelectEquivalents[x_List,f_:Identity, g_:Identity, h_:(#2&)]:=
Reap[Sow[g[#],{f[#]}]&/@x, _, h][[2]];
This allows me to group lists by any criteria and transform them in the process. The way it works is that a c...