Styjun

I am working on an iOS app in objective-c (calculating inbreeding coefficient). I have a for loop nested in a for loop to create a matrix. I am getting strange output when looking for a value in the matrix so I added some logs to see if I could figure out what was going on. Trying to get the diagonal value of the matrix I printed the values being used in the calculation at one specific row/column value. Somehow my code is generating the diagonal value twice with two different values. I cannot understand how one diagonal value is being calculated twice in this code:

for(x = 0; x < results.count; x++) 
 //Loop through all animals to create matrix columns
 NSMutableArray *rows = [[NSMutableArray alloc] init];
 i = 0;

for (i = 0; i < results.count; i++) 
 //Loop through all animals to create matrix rows
 int maleID = [[[results objectAtIndex:i] objectAtIndex:1] intValue];
 int femaleID = [[[results objectAtIndex:i] objectAtIndex:2] intValue];
 //NSString *animalID = [[results objectAtIndex:i] objectAtIndex:3];
 //NSLog(@"animal = %@ male = %d, female = %d",animalID,maleID,femaleID);

 if (i > x)
 //Above diagonal calculation
 //If male unknow tfemale male coefficient = 0
 if (maleID==-1) 
 maleCOE = 0;
 else 
 maleCOE = [[rows objectAtIndex:maleID] floatValue];
 

 //If female unknown tfemale female coefficient = 0
 if (femaleID==-1) 
 femaleCOE = 0;
 else 
 femaleCOE = [[rows objectAtIndex:femaleID] floatValue];
 

 //Calculate breeding pair COE
 float breedingCOE = (maleCOE + femaleCOE)/2;
 [rows addObject:[NSNumber numberWithFloat:breedingCOE]];
 if (x==7 && i==15) 
 NSLog(@"femaleID = %d, maleID = %d, femaleCOE = %f, maleCOE = %f, breedingCOE = %f",femaleID,maleID,femaleCOE,maleCOE,breedingCOE);
 


 if (i < x) 
 //If below diagonal, use prior calculated breedingCOE from above diagonal
 float breedingCOE = [[[columns objectAtIndex:i] objectAtIndex:x]floatValue];
 [rows addObject:[NSNumber numberWithFloat:breedingCOE]];
 

 if (i == x) 

 //NSLog(@"row %d count = %lu",x,(unsigned long)rows.count);
 NSString *str = [rows componentsJoinedByString:@", "];
 //NSLog(@"%@",str);
 //Add row to column
 [columns addObject:rows];