相关疑难解决方法(0)

目前我正试图找到一种平均矩阵的简洁方法.显而易见的解决方案是对矩阵求和,然后除以元素的数量.但是,我在苹果开发者网站上遇到了一种方法,声称可以使用valueForKeyPath以更简单的方式完成此操作.这与以下内容相关联:

http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/KeyValueCoding/Articles/CollectionOperators.html

以下是我正在努力尝试使其工作的示例:

-(void)arrayAverager
{
   NSMutableArray *myArray = [NSMutableArray arrayWithCapacity:25];
   [myArray addObject:[NSNumber numberWithInteger:myValue]];
   NSNumber *averageValue = [myArray valueForKeyPath:@"@avg.self"];
   NSLog(@"avg  = %@", averageValue);

} 

的问题是:代替平均它仅通过1打印出阵列1中的元素阵列.

UPDATE

-(void) pixelAverager

{
    //Put x-coordinate value of all wanted pixels into an array
    NSMutableArray *xCoordinateArray = [NSMutableArray arrayWithCapacity:25];
    [xCoordinateArray addObject:[NSNumber numberWithInteger:xCoordinate]];
    NSLog(@"avg = %@", [xCoordinateArray valueForKeyPath:@"@avg.intValue"]);
 }