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Selecting only numeric columns from a data frame
... R's particular quirks, and more straightforward, and robust to use on database-back-ended tibbles:
dplyr::select_if(x, is.numeric)
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Multiple constructors in python? [duplicate]
...to pass in different kinds of argument I would try to avoid the isinstance-based approach mentioned in another answer, instead using keyword arguments. If using just keyword arguments becomes unwieldy you can combine it with classmethods (the bzrlib code likes this approach). This is just a silly ex...
Add margin above top ListView item (and below last) in Android
..."false"/>
android:clipToPadding is an XML attribute of ViewGroup, the base class for layouts and views containers.
The related method call is:
public void setClipToPadding (boolean clipToPadding)
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What is the recommended way to delete a large number of items from DynamoDB?
...story of starting with a limited feature set first and evaluate extensions based on customer feedback), but here is what you should do to avoid the cost of a full scan at least:
Use Query rather than Scan to retrieve all items for user_id - this works regardless of the combined hash/range primary ...
How to check for the type of a template parameter?
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You can specialize your templates based on what's passed into their parameters like this:
template <> void foo<animal> {
}
Note that this creates an entirely new function based on the type that's passed as T. This is usually preferable as it ...
Toggle Checkboxes on/off
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This can get tangly as it bases the status off of the first one (so if the user checks the first one, then uses the toggle, they'll get out of sync). Slightly tweaked so it bases the status off of the toggle, not the first checkbox in the list: $("in...
Creation timestamp and last update timestamp with Hibernate and MySQL
... exclusive behaviours to your entities (and you can't extend more than one base class). afaik the only way to obtain the same effect without a base class is though aspectj itd or event listeners see @kieren dixon answer
– gpilotino
Feb 2 '12 at 0:49
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Mean per group in a data.frame [duplicate]
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I describe two ways to do this, one based on data.table and the other based on reshape2 package . The data.table way already has an answer, but I have tried to make it cleaner and more detailed.
The data is like this:
d <- structure(list(Name = structure...
Get selected text from a drop-down list (select box) using jQuery
...ng. They're not random at all, they're structural and follow strict rules (based on things like whether you put an ID on your control, and if not then based on the index of where they occur in the current level of the tree, etc)
– freefaller
Mar 9 '17 at 14:03
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Where is the WPF Numeric UpDown control?
... }
#endregion
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
_UpButton = Template.FindName("Part_UpButton", this) as RepeatButton;
_DownButton = Template.FindName("Part_DownButton", this) as RepeatButton;
_UpButton.Click += _UpButton_Clic...