map

问题 From a sql database, I am reading a table with 2 fields: appName, user. So I may see: +-------------+ | appA | John | +-------------+ | appB | Mary | +-------------+ | appC | Tom | +-------------+ | appA | John | +-------------+ | appA | Mary | +-------------+ Each of these records is stored as an object of a AppClass with appName and user. Now, i want to list how many times the apps were run by different users. So : +-----------------+ | appA | John | 2 | +-----------------+ | appA | Mary |

问题 I copied this code from a book: lyst = {'Hi':'Hello'} def changeWord(sentence): def getWord(word): lyst.get(word, word) return ''.join(map(getWord, sentence.split())) I get this error: Traceback (most recent call last): File "<pyshell#4>", line 1, in <module> cambiaPronome('ciao') File "C:\Python33\2.py", line 6, in cambiaPronome return ''.join(map(getWord, list(frase))) TypeError: sequence item 0: expected str instance, NoneType found What is wrong? 回答1: The getWord function doesn't

问题 I would like to know how I can merge maps in Scala. val prevMap = Map(1-> Set("a"), 2-> Set("b")) val newMap = Map(2-> Set("a","b"),1-> Set("c")) val expected = Map(1->Set("a","c"), 2-> Set("a","b")) Basically, expected map is newMap + add all values that had a different key between prev and new Thanks 回答1: Using the standard library, like this, m1 ++ m2.map { case (k,v) => k -> (v ++ m1.getOrElse(k,Set())) } Consider the first occurrence of ++ , for appending maps. The key value pairs of the

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: How to count occurrence of an element in a List Count occurences of word in ArrayList Assume I have a List the following values emp1, emp2, emp3, emp2, emp1, emp4, emp1 I need to get the number of times a string is repeated such as the following emp1 - 3 times emp2 - 2 times emp3 - 1 times emp4 - 1 times I am trying to implement this by using map. Is this the correct way or is there any better way? 回答1: You can

问题 Recently I tried to follow these steps: website. with the casual way of adding the map to be visible into the screen using this code: GPSTrackerActivity.java public class GPSTrackerActivity extends Activity { private SDCardHandler SDTool; private ToastSender ToastObject; private FrameLayout frm_lay; private MapView myOpenMapView; private MapController myMapController; @Override protected void onCreate(Bundle in) { super.onCreate(in); setContentView(R.layout.activity_gpstracker); SDTool = new

问题 Im trying to implement a button which fills after click Latitude Longitude Street Streetnumber Postalcode City myGeoposition.CivicAddress. gives me City and Postalcode myGeoposition.Coordinate. gives me the Lati/Longitude where do I get the rest? I am using a Map-Control (not bing map!) from: Microsoft.Phone.Maps.Controls;assembly=Microsoft.Phone.Maps try { Geolocator geolocator = new Geolocator(); geolocator.DesiredAccuracy = PositionAccuracy.Default; IAsyncOperation<Geoposition>

问题 i have a map and the map have annotation , and i can see these annotation in table view as a cells then i can see the details for any cell i selected like the master details project in the xcode like this - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([[segue identifier] isEqualToString:@"showDetail"]) { NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow]; Object *object = [self.objects objectAtIndex:indexPath.row]; DetailsViewController

问题 I made sample project for map MapBox its done but when i am terrain map type set its show perfectly but issue is example(label) shown. How can i remove for this issue? Help me thanks in advance. I show issue for this image. 回答1: This library is open source. Go in and remove the label by editing the source code. There is not a public API for this. 来源： https://stackoverflow.com/questions/22608128/how-to-remove-examplelabel-for-map-backgroud-mapbox-in-android

问题 I'm working on a finite deterministic automaton based on this. From this code: public void markInitialState (int initialStateId) { State theInitialState = allStates.get(initialStateId); theInitialState.isInitial=true; allStates.add(initialStateId, theInitialState); /*DEBUG*/ System.out.println(" THE INITIAL STATE ID IS " + initialStateId); theInitialState = allStates.get(initialStateId); if ((theInitialState.isInitial)==true) System.out.println("THE STATE " + theInitialState + " IS MARKED AS

问题 I have a std::map<std::string,foo> and need to frequently find() elements when instead of a std::string , I have a const char* . However, map.find("key_value") won't work, I need a std::string . So, I would need to map.find(std::string{"key_value"}) , but this will create a temporary std::string (with its allocation and de-allocation) each time, making this potentially inefficient. Is this reasoning correct? If yes, how can I improve the situation? I was think about using a wrapper around