MaxGabriel

//Draws a Cartesian Coordinate system and graphs an equation on it. 
//Equation comes from GraphViewController (data source)
- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGPoint midPoint; //center in coordinate system
    midPoint.x = self.bounds.origin.x + self.bounds.size.width/2;
    midPoint.y = self.bounds.origin.y + self.bounds.size.height/2;
    

MaxGabriel

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"graph"]) {
        [segue.destinationViewController setGraphStack:[self.brain program]];
    }
}

MaxGabriel

@class GraphView;

@protocol GraphViewDataSource
- (float)deltaY:(GraphView *)sender;
@end

@interface GraphView : UIView

@property (nonatomic) CGFloat xValue;
@property (nonatomic, weak) IBOutlet id <GraphViewDataSource> dataSource;

MaxGabriel

@interface GraphViewController() <GraphViewDataSource>
@property (nonatomic, weak) IBOutlet GraphView *graphView;

@end 

MaxGabriel

- (float)deltaY:(GraphView *)sender
{
    float xVar = sender.xValue;
    
    id xVar2 = [NSNumber numberWithFloat:xVar];
    NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];

    [dict setValue:xVar2 forKey: @"x"];
    
    float result = [CalculatorBrain runProgram:self.graphStack usingVariableValues:dict];

MaxGabriel

//Iterates through program, an array of operations and NSNumbers
//Returns human-readable list of numbers and operations in RPN
+ (NSString *)descriptionOfProgram:(id)program
{
    NSString *description = [[NSString alloc] init];
    if ([program isKindOfClass:[NSArray class]]) {
        
        for (int i=0; i<[program count]; i++) {
            
            if ([[program objectAtIndex:i] isKindOfClass:[NSNumber class]]) {

MaxGabriel

+ (BOOL)isOperation:(NSString *)argument
{
    NSSet *operations = [NSSet setWithObjects:@"+",@"-",@"/",@"*",@"sin",@"cos",@"sqrt",@"pi",nil];
    if ([operations containsObject:argument])
        return YES;
    else
        return NO;
}

//Converts variables in program to their double value

MaxGabriel

- (void)viewDidLoad
{
[super viewDidLoad];
self.title = _photoName;

_imageView.image = _image;
_imageView.frame = (CGRect){CGPointZero, _imageView.image.size};

_scroller.contentSize = _imageView.image.size;
_scroller.minimumZoomScale = .3;        

MaxGabriel

# ----------
# User Instructions:
# 
# Define a function, search() that takes no input
# and returns a list
# in the form of [optimal path length, x, y]. For
# the grid shown below, your function should output
# [11, 4, 5].
#
# If there is no valid path from the start point

MaxGabriel

# ----------
# User Instructions:
# 
# Implement the function optimum_policy2D() below.
#
# You are given a car in a grid with initial state
# init = [x-position, y-position, orientation]
# where x/y-position is its position in a given
# grid and orientation is 0-3 corresponding to 'up',
# 'left', 'down' or 'right'.