移動平均法サンプル

gistfile1.m

//
//  CYMainViewController.h
//  IdoAvg
//
//  Created by tikitikipoo on 11/12/12.
//  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
//

#import "CYFlipsideViewController.h"

@interface CYMainViewController : UIViewController <CYFlipsideViewControllerDelegate>

@property (nonatomic, strong) NSMutableDictionary* loopCnt;

- (IBAction)showInfo:(id)sender;
- (IBAction)tapButton:(id)sender;

@end


//
//  CYMainViewController.m
//  IdoAvg
//
//  Created by tikitikipoo on 11/12/12.
//  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
//

#import "CYMainViewController.h"

@implementation CYMainViewController


@synthesize loopCnt;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}





#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    // 移動平均のインデックスポインタ
    self.loopCnt = [[NSMutableDictionary alloc] init];
    
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
	[super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
	[super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

#pragma mark - Flipside View

- (void)flipsideViewControllerDidFinish:(CYFlipsideViewController *)controller
{
    [self dismissModalViewControllerAnimated:YES];
}

- (IBAction)showInfo:(id)sender
{    
    CYFlipsideViewController *controller = [[[CYFlipsideViewController alloc] initWithNibName:@"CYFlipsideViewController" bundle:nil] autorelease];
    controller.delegate = self;
    controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller animated:YES];
}

// 移動平均を格納するインデックス値
int _loopIndex = -1;

- (IBAction)tapButton:(id)sender
{
    // 現在のタイムスタンプ値を取得
    NSTimeInterval timestamp = [[NSDate date] timeIntervalSince1970];
    NSNumber* timeNum = [NSNumber numberWithDouble:timestamp];
    NSInteger timeInt = [timeNum intValue];
    
    // 0~5の範囲で移動平均を保持
    _loopIndex = (_loopIndex + 1) % 5;
    [self.loopCnt setValue:[NSNumber numberWithInt:timeInt] 
                    forKey:[NSString stringWithFormat:@"%d", _loopIndex]];

    // 昇順にソート
    NSMutableArray* tempArray = [NSMutableArray arrayWithArray:[self.loopCnt allValues]]; 
    tempArray = (NSMutableArray*)[tempArray sortedArrayUsingSelector:@selector(compare:)];
    NSLog(@"tempArray:%@", tempArray);
    
    NSInteger minValue = [[tempArray objectAtIndex:0] intValue];
    NSInteger maxValue  = [[tempArray objectAtIndex:[tempArray count]-1] intValue];
        
    // 最初のタップは計算しない
    if ([tempArray count] < 2) return;
    
    // 差の絶対値から平均を求める
    NSInteger avg = 0;
    NSInteger sub = abs(maxValue - minValue);
    avg = ceil(sub / ([tempArray count] -1));
    NSLog(@"avg:%d", avg);
}

@end