Andrea Busi
a9f16bca4a
- Move to Models folder - Improve code and nullability notation - Rename class with typo in name
66 lines
1.5 KiB
Objective-C
66 lines
1.5 KiB
Objective-C
//
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// EQNMath.m
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// Earthquake Network
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//
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// Created by Luca Beretta on 14/09/18.
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// Copyright © 2018 Luca Beretta. All rights reserved.
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//
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#import "EQNMath.h"
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#import "Costanti.h"
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#include <math.h>
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@implementation EQNMath
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#pragma mark - Public
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+ (float)powSum:(CMAccelerometerData *)accelerometerData {
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return sqrt(pow(accelerometerData.acceleration.x, 2.0)+pow(accelerometerData.acceleration.y, 2.0)+pow(accelerometerData.acceleration.z, 2.0));
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}
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+ (NSNumber *)meanOf:(NSArray *)array
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{
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double runningTotal = 0.0;
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for (NSNumber *number in array)
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{
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runningTotal += [number doubleValue];
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}
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return [NSNumber numberWithDouble:(runningTotal / [array count])];
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}
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+ (NSNumber *)standardDeviationOf:(NSArray *)array
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{
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if (![array count]) {
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return nil;
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}
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double mean = [[self meanOf:array] doubleValue];
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double sumOfSquaredDifferences = 0.0;
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for (NSNumber *number in array)
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{
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double valueOfNumber = [number doubleValue];
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double difference = valueOfNumber - mean;
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sumOfSquaredDifferences += difference * difference;
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}
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return [NSNumber numberWithDouble:sqrt(sumOfSquaredDifferences / [array count])];
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}
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+ (NSDictionary *)rLimiti:(NSArray *)array
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{
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float xmax = -MAXFLOAT;
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float xmin = MAXFLOAT;
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for (NSNumber *num in array) {
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float x = num.floatValue;
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if (x < xmin) xmin = x;
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if (x > xmax) xmax = x;
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}
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return @{rMax : @(xmax), rMin : @(xmin)};
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}
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@end
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