Parabolic Fit Test

ParabolicFitTest.m

#import "ParabolicFitTest.h"

@interface ParabolicFitTest ()

- (NSInteger)functionOne:(NSInteger)index;
- (NSInteger)functionTwo:(NSInteger)index;

@end

@implementation ParabolicFitTest {
  // Function variables
  NSInteger _maxPeakHeight;
  NSInteger _numberOfFrames;
}

- (id)init
{
  if ((self = [super init])) {
    self.repetitions = 1000; // Default number of repetitions
    
    _maxPeakHeight = 32768;
    _numberOfFrames = 1000;
  }
  return self;
}

- (void)runBatch
{
  for (NSInteger r=0; r < self.repetitions; r++) {
    [self runSingle];
  }
}

- (void)runSingle
{
  for (NSInteger i=0; i < _numberOfFrames; i++) {
    [self functionOne:i];
    [self functionTwo:i];
  }
}

#pragma mark - Actual to-test functions

- (NSInteger)functionOne:(NSInteger)index
{
  NSInteger result = -(index - _numberOfFrames/2)^2 / (_numberOfFrames/2)^2*_maxPeakHeight + 
  _maxPeakHeight;
  return result;
}

- (NSInteger)functionTwo:(NSInteger)index
{
  NSInteger result = sinf((float)index/_numberOfFrames*M_PI)*_maxPeakHeight;
  return result;
}

@end