I have made a NSDictionary HospitalDictionary which holds latitude,longitude and distances
NSMutableArray *HospitalArray = [NSMutableArray array];
NSDictionary *HospitalDictionary = [[NSDictionary alloc]init];
NSString *LATITUDE = #"latitude";
NSString *LONGITUDE = #"longitude";
NSString *DISTANCE = #"distance";
for (int i=0; i<=100; i++) {
// calculations for coordinates and distance are done ....
HospitalDictionary = [NSDictionary dictionaryWithObjectsAndKeys:latitude, LATITUDE,
longitude, LONGITUDE,[NSNumber numberWithInt:distanceInKm], DISTANCE, nil];
[HospitalArray addObject:HospitalDictionary];
{
Then data is short using following code
// These line are added to short the Dictionary added to Array List with the Key of Distance
NSSortDescriptor *distanceDescriptor = [[NSSortDescriptor alloc] initWithKey:DISTANCE ascending:YES];
id obj;
NSEnumerator * enumerator = [HospitalArray objectEnumerator];
NSArray *descriptors = [NSArray arrayWithObjects:distanceDescriptor, nil];
NSArray *sortedArray = [HospitalArray sortedArrayUsingDescriptors:descriptors];
enumerator = [sortedArray objectEnumerator];
// this will print out the shorted list for DISTANCE
while ((obj = [enumerator nextObject])) NSLog(#"%#", obj);
// this will return the object at index 1
NSLog(#"Selected array is %#",[sortedArray objectAtIndex:1]);
Output of this is -
2012-05-30 08:24:42.784 Hospitals[422:15803]
sorted array is
{
distance = 1;
latitude = "27.736221";
longitude = "85.330095";
}
I want to get only Latitude or Longitude for the ObjectAtIndex:1 for the sortedArray. How can i get the particular value ie. latitude out of sortedArray not the complete list.
To access a property/method of an object in an array, you can use something like this:
NSLog(#"Latitude for object at index 1 is %#",[[sortedArray objectAtIndex:1] latitude]);
Related
I have an nsmutable array of friends list.each having their lat&longs.I want to sort that array with the ascending rate of their distances from the autor.I found out the distances values of the friends with the autor,Now I want to sort that array in the ascending of their distances.This is how i am doing that,`
for(int i=0;i<[searchfriendarray count];i++)
{
NSDictionary *payload =[searchfriendarray objectAtIndex:i];
NSLog(#"%#",payload);
NSString *memberid = [payload objectForKey:#"userID"];
CLLocation *locationofauthor;
CLLocation *locationoffriends;
if([memberid isEqualToString:uidstr])
{
NSString *latofauthor = [payload objectForKey:#"latitude"];
NSString *longofauthor=[payload objectForKey:#"longitude"];
double latofauthordouble = [latofauthor doubleValue];
double longofauthordouble=[longofauthor doubleValue];;
locationofauthor = [[CLLocation alloc] initWithLatitude:latofauthordouble longitude:longofauthordouble];
}
else
{
NSString *latoffriends = [payload objectForKey:#"latitude"];
NSString *longoffriends=[payload objectForKey:#"longitude"];
double latoffriendsdouble = [latoffriends doubleValue];
double longoffriendsdouble=[longoffriends doubleValue];;
locationoffriends = [[CLLocation alloc] initWithLatitude:latoffriendsdouble longitude:longoffriendsdouble];
}
CLLocationDistance distance = [locationofauthor distanceFromLocation:locationoffriends];
}
`Can any body help me to sort my array in the ascecending order of the distances?
You can supply a block of comparison code between 2 objects. NSArray will then call your block as many times as it needs to sort the array.
NSArray sortedArray = [yourUnsortedArray sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
/*some code to compare obj1 to obj2.
for instance, compare the distances of obj1 to obj2.
Then return an NSComparisonResult
(NSOrderedAscending, NSOrderedSame, NSOrderedDescending);*/
}];
p.s. to get a mutable array again, just call mutableCopy on the returned object.
NSSortDescriptor * descLastname = [[NSSortDescriptor alloc] initWithKey:#"active" ascending:YES];
[livevideoparsingarray sortUsingDescriptors:[NSArray arrayWithObjects:descLastname, nil]];
[descLastname release];
videoparsing = [livevideoparsingarray copy];
livevideoparsingarray is my array which I have sort & active is my tag which is in array which I have sort. You change with your requirements.
I have input as two arrays shown below
NSArray *array1=[[NSArray alloc]initWithObjects:#"1",#"2",#"3", nil];
NSArray *array2=[[NSArray alloc]initWithObjects:#"1",#"2",#"1", nil];
the output should resemble like this.
the same element should be cancelled only one time.
NSArray *array3=[[NSArray alloc]initWithObjects:#"1",#"2", nil];
THANKS IN ADVANCE.....
NSArray *array1 = #[#"1",#"2",#"3"];
NSArray *array2 = #[#"1",#"2",#"1"];
NSMutableSet *allElemets = [NSSet setWithArray:array1];
[allElemets addObjectsFromArray:array2];
This will return you all elements without duplicates.
In this case it will be
#"1",#"2",#"3"
Edit:
This will return the intersection of the arrays
NSMutableSet *set1 = [NSMutableSet setWithArray:array1];
NSSet *set2 = [NSSet setWithArray:array2];
[set1 intersectSet:set2];
Use NSCountedSet for the above situation
NSMutableArray *array1=[[NSMutableArray alloc]initWithObjects:#"r",#"a",#"r",#"r",#"r", nil];
NSArray *array2=[[NSArray alloc]initWithObjects:#"b",#"c",#"r", nil];
NSMutableSet *setOne = [NSMutableSet setWithArray: array1];
NSSet *setTwo = [NSSet setWithArray: array2];
[setOne unionSet:setTwo];
NSArray *arrayOneResult = [setOne allObjects];
NSLog(#"%#",arrayOneResult);
NSMutableArray *resultArray = [[NSMutableArray alloc]init];
NSCountedSet *set = [[NSCountedSet alloc] initWithArray:arrayOneResult];
for (id item in set)
{
NSCountedSet *set1 = [[NSCountedSet alloc] initWithArray:array1];
NSCountedSet *set2 = [[NSCountedSet alloc]initWithArray:array2];
int diff = abs([set1 countForObject:item] - [set2 countForObject:item]);
for (int i = 0 ;i < diff ;i++ ) {
[resultArray addObject:item];
}
}
NSLog(#"the array : %#",resultArray );
f you are fine with sets instead of arrays, you can use NSMutableSet instead of NSArray. NSMutableSet has nice methods like intersectSet: and minusSet:
if([[array1 objectAtIndex:i] isEqualToString:[array2 objectAtIndex:i]])
{
[array2 removeObjectAtIndex: i];
NSLog(#"same element removed.");
}
array3 = [firstArray arrayByAddingObjectsFromArray:secondArray];
or
NSMutableSet *set = [NSMutableSet setWithArray:array1];
[set addObjectsFromArray:array2];
array3 = [set allObjects];
Two arrays are compared and duplicate values are removed, you get your values.
Here tHe Code goes
EDIt: This WOuld remove the Duplicate Value add Unique value.
NSArray *array1=[[NSArray alloc]initWithObjects:#"1",#"2",#"3", nil];
NSArray *array2=[[NSArray alloc]initWithObjects:#"1",#"2",#"1", nil];
//Here Create nEw Array with Arra1
NSMutableArray * newArray =[[NSMutableArray alloc] initWithArray:array1];
for(int index=0; index<[array2 count];index++)
{
id object =[array2 objectAtIndex:index];
if(![newArray containsObject:object])//this methods Returns YES/NO
{
[newArray addObject: object];
}
}
I have model class which contains NSString's- studentName, studentRank and studentImage. I wanna sort the NSMutableArray according to studentRanks. what I have done is
- (void)uploadFinished:(ASIHTTPRequest *)theRequest
{
NSString *response = nil;
response = [formDataRequest responseString];
NSError *jsonError = nil;
SBJsonParser *json = [[SBJsonParser new] autorelease];
NSArray *arrResponse = (NSArray *)[json objectWithString:response error:&jsonError];
if ([jsonError code]==0) {
// get the array of "results" from the feed and cast to NSArray
NSMutableArray *localObjects = [[[NSMutableArray alloc] init] autorelease];
// loop over all the results objects and print their names
int ndx;
for (ndx = 0; ndx < arrResponse.count; ndx++)
{
[localObjects addObject:(NSDictionary *)[arrResponse objectAtIndex:ndx]];
}
for (int x=0; x<[localObjects count]; x++)
{
TopStudents *object = [[[TopStudents alloc] initWithjsonResultDictionary:[localObjects objectAtIndex:x]] autorelease];
[localObjects replaceObjectAtIndex:x withObject:object];
}
topStudentsArray = [[NSMutableArray alloc] initWithArray:localObjects];
}
}
How can I sort this topStudentsArray according to the ranks scored by the Students and If the two or more student have the same rank, How can I group them.
I did like this
TopStudents *object;
NSSortDescriptor * sortByRank = [[[NSSortDescriptor alloc] initWithKey:#"studentRank" ascending:NO] autorelease];
NSArray * descriptors = [NSArray arrayWithObject:sortByRank];
NSArray * sorted = [topStudentsArray sortedArrayUsingDescriptors:descriptors];
but this is not displaying results properly. please help me to overcome this problem. thanks in advance.
doing something like this might do the trick
Initially sort the arrGroupedStudents in the (ascending/descending) order of studentRank
//Create an array to hold groups
NSMutableArray* arrGroupedStudents = [[NSMutableArray alloc] initWithCapacity:[topStudentsArray count]];
for (int i = 0; i < [topStudentsArray count]; i++)
{
//Grab first student
TopStudents* firstStudent = [topStudentsArray objectAtIndex:i];
//Create an array and add first student in this array
NSMutableArray* currentGroupArray = [[[NSMutableArray alloc] initWithCapacity:0] autorelease];
[currentGroupArray addObject:firstStudent];
//create a Flag and set to NO
BOOL flag = NO;
for (int j = i+1; j < [topStudentsArray count]; j++)
{
//Grab next student
TopStudents* nextStudent = [topStudentsArray objectAtIndex:j];
//Compare the ranks
if ([firstStudent.studentRank intValue] == [nextStudent.studentRank intValue])
{
//if they match add this to same group
[currentGroupArray addObject:nextStudent];
}
else {
//we have got our group so stop next iterations
[arrGroupedStudents addObject:currentGroupArray];
// We will assign j-1 to i
i=j-1;
flag = YES;
break;
}
}
//if entire array has students with same rank we need to add it to grouped array in the end
if (!flag) {
[arrGroupedStudents addObject:currentGroupArray];
}
}
Finally your arrGroupedStudents will contain grouped array with equal rank. I have not test run the code so you might need to fix a few things falling out of place. Hope it helps
If you want to display in the order of ranks, you should set the ascending as YES.
NSSortDescriptor * sortByRank = [[NSSortDescriptor alloc] initWithKey:#"studentRank" ascending:YES];
static int mySortFunc(NSDictionary *dico1, NSDictionary *dico2, void *context)
{
NSString *studentName1 = [dico1 objectForKey:#"studentName"];
NSString *studentName2 = [dico2 objectForKey:#"studentName"];
return [studentName1 compare:studentName2];
}
- (IBAction)sortBtnTouched:(id)sender
{
[topStudentsArray sortUsingFunction:mySortFunc context:NULL];
}
I have a long list of places with Latitudes and Longitudes in a plist. I want to show a tableView of the places only within X distance of the user's current location. Is there a way to create objects from the lats & longs in the plist file so I can use 'distanceFromLocation'? More importantly, how do I get the array to only display the names with a distance from current less than X? I'm assuming I would need to make a series of objects from lats & longs in the plist, then do an objects in array if objects distanceFrom is less than X, correct?
Please help.
Here's where I am now: I get an error on the double clubLatitude line
- (void)viewDidLoad {
[super viewDidLoad];
NSArray *clubArray = [NSArray arrayWithObjects:[self danceClubLocation], nil];
self.tableData = clubArray;
}
-(CLLocation *)danceClubLocation
{
NSString *plistPath = [[NSBundle mainBundle] pathForResource:#"Data" ofType:#"plist"];
NSArray *array = [NSArray arrayWithContentsOfFile:plistPath];
NSEnumerator *e = [array objectEnumerator];
id object;
while ((object = [e nextObject])) {
double clubLatitude = [[array valueForKey:#"Latitude"] doubleValue];
double clubLongitude = [[array valueForKey:#"Longitude"] doubleValue];
CLLocation *clubLocation = [[CLLocation alloc] initWithLatitude:clubLatitude longitude:clubLongitude];
if ([clubLocation distanceFromLocation:myLocation]<=50) {
return clubLocation;
}
else return nil;
}
return nil;
}
-(CLLocation *)myLocation
{
CLLocation *location = [locationManager location];
CLLocationCoordinate2D coordinate = [location coordinate];
NSNumber *myLatitude = [NSNumber numberWithDouble:coordinate.latitude];
NSNumber *myLongitude = [NSNumber numberWithDouble:coordinate.longitude];
double myLatitudeD = [myLatitude doubleValue];
double myLongitudeD = [myLongitude doubleValue];
myLocation = [[CLLocation alloc]initWithLatitude:myLatitudeD longitude:myLongitudeD];
return myLocation;
}
As #DavidNeiss said, you have to iterate over the list (an NSArray with the plist as source) and it would be something like this:
NSString *plistPath = [[NSBundle mainBundle] pathForResource:#"latlong" ofType:#"plist"];
NSArray *array = [NSArray arrayWithContentsOfFile:plistPath];
NSEnumerator *e = [array objectEnumerator];
id object;
while (object = [e nextObject]) {
// do something with object
}
Then you can do what you want (removing what's far from the user or whatever).
Read in your plist, iterate over it to pull out ones within X distance and populate any array with them that will be the data source for your table view?
i have an array like
[chapter,indent,left,indent,nonindent,chapter,chapter,indent,indent,left];
i need to find indexes of duplicates and also non duplicate elements .
how to do this...........give some sample code or logic......
thanks in advance
iam using objective c.....
NSArray *myWords = [string componentsSeparatedByString:#"class=\""];
int count_var=[myWords count];
tmp1=#"";
for(int i=1;i<count_var;i++)
{
str=[NSString stringWithFormat:#"\n%#",[myWords objectAtIndex:i]];
class=[str componentsSeparatedByString:#"\""];
NSString *tmp=[NSString stringWithFormat:#"%#",[class objectAtIndex:0]];
tmp1=[[NSString stringWithFormat:#"%#",tmp1] stringByAppendingString:[NSString stringWithFormat:#"%#",tmp]];
}
t1.editable=NO;
t1.text=tmp1;
NSArray *tempo=[[NSArray alloc]init];
tempo=[tmp1 componentsSeparatedByString:#"\n"];
tempCount=[tempo count];
this is my sample code...in this the array tempo contains all objects from that array i want to get index of duplicate stringsā„.
You could build a dictionary mapping the objects to index sets. For every index set, a -count of 1 means no duplicates, > 1 means there are duplicates.
NSArray *arr = [NSArray arrayWithObjects:...];
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for (NSUInteger i=0; i<[arr count]; ++i) {
id obj = [arr objectAtIndex:i];
NSMutableIndexSet *ids = [dict objectForKey:obj];
if (!ids) {
ids = [NSMutableIndexSet indexSet];
[dict setObject:ids forKey:obj];
}
[ids addIndex:i];
}
NSLog(#"%#", dict);