difference between locationOfTouch:inView and locationInView

Hi Forum,

i want to see if anyone can please explain the difference between these two methods for me. I have read the apple docs over and over again but i do not understand the difference. So here is my code... in my view controller i have

Code:

 UITapGestureRecognizer *tripleTapToAdjustOrigin = [[UITapGestureRecognizer alloc]
                                                        initWithTarget:self.graphview 
                                                        action:@selector(tripleTapToAdjustOrigin:)];
    tripleTapToAdjustOrigin.numberOfTapsRequired = 3;
    [self.graphview addGestureRecognizer:tripleTapToAdjustOrigin];

and in my view class i have the method "tripleTapToAdjustOrigin" and in it i have

Code:

- (void)tripleTapToAdjustOrigin:(UITapGestureRecognizer *)gesture
{
    if((gesture.state == UIGestureRecognizerStateEnded))
       {
           self.axisOrigin = [gesture locationInView:self];
       }
}

when i use locationInView it works perfectly, if i use locationOfTouch:0 inView:self also works, but picking any number other than 0 , like 1 or 2 crashes my program. My (incomplete) understanding is that the index determines which touch we are interested it....so how does it really work? i will really appreciate the help.