Multidimensional NSArray: How to find min value with valueForKeyPath ?

Question

Hi,
I've setup a multidimensional NSArray with columns and rows. The data is read from a file and are float values.
I can easily access the data like this:
NSLog(@"Row[0][0] %f", [[[rows objectAtIndex:0] objectAtIndex:0] doubleValue] );
NSLog(@"Row[0][1] %f", [[[rows objectAtIndex:1] objectAtIndex:0] doubleValue] );
NSLog(@"Row[0][2] %f", [[[rows objectAtIndex:2] objectAtIndex:0] doubleValue] );
etc.
However I don't know how to get the min/max values for a column in a 2 dimensional NSArray.
With a simple NSArray it's easy to retrieve the min/max value:
NSArray *array = [NSArray arrayWithObjects:[NSNumber numberWithInt:16], [NSNumber numberWithInt:4], [NSNumber numberWithInt:128], nil);
NSLog(“Min value : %@", [array valueForKeyPath:@"@min.intValue"]);
Now, does someone know how to retrieve min/max values with valueForKeyPath: ?
Any help is greatly appreciated.
Cheers,
Gilles

Answer 1

#import <Foundation/Foundation.h>
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSMutableArray * array = [[NSMutableArray alloc]init];
NSMutableArray * another = [[NSMutableArray alloc]init];
NSNumber * num1 = [NSNumber numberWithFloat:1.1];
NSNumber * num2 = [NSNumber numberWithFloat:1.2];
NSNumber * num3 = [NSNumber numberWithFloat:1.3];
[another addObject:num1];
[another addObject:num2];
[another addObject:num3];
[array addObject:another];
NSLog(@"%@",[[array objectAtIndex:0] valueForKeyPath:@"@min.floatValue"]);
[another release];
[array release];
[pool drain];
return 0;
Maybe I'm not 100% clear on the question your asking, but doesn't the above code get the min(or max if you wanted) value for the second array