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dplyr: “Error in n(): function should not be called directly”
...ons with masking functions, it is clear to use the "package::function" specification, like example below:
delay <- dplyr::summarise(by_tailnum,
count = n(),
dist = mean(distance, na.rm = TRUE),
delay = mean(arr_delay, na.rm = TRUE))
...
Is it possible to make anonymous inner classes in Java static?
...'t recall having seen any obvious errors in the Java Glossary before. From now on, I take it with a grain of salt.
– Michael Myers♦
Apr 17 '09 at 15:17
2
...
How to make a .jar out from an Android Studio project
..., but no release folder. What version of the plugin are you using? Do you know if this is documented anywhere?
– Cameron Lowell Palmer
Apr 7 '17 at 14:01
...
How to hide first section header in UITableView (grouped style)
...(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
if (section == 0)
return 1.0f;
return 32.0f;
}
- (NSString*) tableView:(UITableView *) tableView titleForHeaderInSection:(NSInteger)section
{
if (section == 0) {
return nil;
} else {
/...
Debug Error \"pure virtual function call\" 原因解析 - 更多技术 - 清泛...
...
public:
virtual void virtualFunc(){}
};
Base* pB = new Derived;
__try
{
delete pB; // . . . b)
pB = NULL;
}
__except(EXCEPTION_EXECUTE_HANDLER){
}
pB->virtualFunc(); // . . . c)
在b)处析构Derived对象的时候，在其基类析构函数中a)处抛出了...
How to reduce iOS AVPlayer start delay
... any given time have a maximum of 2 AVPlayers loaded.
Of course I don't know whether the switching can be done so smoothly that it does not disturb playback.
(Would have added this as a comment if I could.)
Best, Peter
...
Return XML from a controller's action in as an ActionResult?
...ublic override void ExecuteResult(ControllerContext context)
{
if (this.objectToSerialize != null)
{
context.HttpContext.Response.Clear();
var xs = new System.Xml.Serialization.XmlSerializer(this.objectToSerialize.GetType());
context.HttpContex...
What is the difference between integration and unit tests?
I know the so-called textbook definition of unit tests and integration tests. What I am curious about is when it is time to write unit tests... I will write them to cover as many sets of classes as possible.
...
How do you set the Content-Type header for an HttpClient request?
...
Just so folks know, using MediaTypeHeaderValue will return an error if attempting to set the charset, like so; response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/xml; charset=utf-8");
– MBak
...
How to fix: android.app.RemoteServiceException: Bad notification posted from package *: Couldn't cre
...ferences changed. The integer that used to reference the correct drawable now referenced either the incorrect drawable or none at all (none at all - causing this crash)
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