我有一些像这样的数组
$arr_dt[criteria1][alternative1] = 25;
$arr_dt[criteria1][alternative2] = 64;
$arr_dt[criteria1][alternative3] = 46;
$arr_dt[criteria2][alternative1] = 80;
$arr_dt[criteria2][alternative2] = 100;
$arr_dt[criteria2][alternative3] = 25;
如何根据标准或替代方案获得最小/最大值？
标准可能具有相同的值，如下所示
scala> val list = List(1,2,3)
list: List[Int] = List(1, 2, 3)
scala> val rdd = sc.parallelize(List(1,2,3,4))
rdd: org.apache.spark.rdd.RDD[Int] = ParallelCollectionRDD[4] at parallelize at <console>:24
scala> rdd.filter(elem => list.contains(elem)).collect
17/03/16 10:21:53 INFO SparkContext: Starting job: collect at <console>:29
17/03/16 10:21:53 INFO DAGScheduler: Got job 3 (collect at <console>:29) with 4 output partitions
17/03/16 10:21:53 INFO DAGScheduler: Final stage: ResultStage 3 (collect at <console>:29)
17/03/16 10:21:53 INFO DAGScheduler: Parents of final stage: List()
17/03/16 10:21:53 INFO DAGScheduler: Missing parents: List()
17/03/16 10:21:53 DEBUG DAGScheduler: submitStage(ResultStage 3)
17/03/16 10:21:53 DEBUG DAGScheduler: missing: List()
17/03/16 10:21:53 INFO DAGScheduler: Submitting ResultStage 3 (MapPartitionsRDD[5] at filter at <console>:29), which has no missing parents
17/03/16 10:21:53 DEBUG DAGScheduler: submitMissingTasks(ResultStage 3)
17/03/16 10:21:53 INFO MemoryStore: Block broadcast_4 stored as values in memory (estimated size 5.0 KB, free 366.3 MB)
17/03/16 10:21:53 DEBUG BlockManager: Put block broadcast_4 locally took 1 ms
17/03/16 10:21:53 DEBUG BlockManager: Putting block broadcast_4 without replication took 1 ms
17/03/16 10:21:53 INFO MemoryStore: Block broadcast_4_piece0 stored as bytes in memory (estimated size 2.5 KB, free 366.3 MB)
17/03/16 10:21:53 INFO BlockManagerInfo: Added broadcast_4_piece0 in memory on 192.168.2.123:37645 (size: 2.5 KB, free: 366.3 MB)
17/03/16 10:21:53 DEBUG BlockManagerMaster: Updated info of block broadcast_4_piece0
17/03/16 10:21:53 DEBUG BlockManager: Told master about block broadcast_4_piece0
17/03/16 10:21:53 DEBUG BlockManager: Put block broadcast_4_piece0 locally took 2 ms
17/03/16 10:21:53 DEBUG ContextCleaner: Got cleaning task CleanBroadcast(1)
17/03/16 10:21:53 DEBUG BlockManager: Putting block broadcast_4_piece0 without replication took 2 ms
17/03/16 10:21:53 DEBUG ContextCleaner: Cleaning broadcast 1
17/03/16 10:21:53 DEBUG TorrentBroadcast: Unpersisting TorrentBroadcast 1
17/03/16 10:21:53 INFO SparkContext: Created broadcast 4 from broadcast at DAGScheduler.scala:996
17/03/16 10:21:53 INFO DAGScheduler: Submitting 4 missing tasks from ResultStage 3 (MapPartitionsRDD[5] at filter at <console>:29)
17/03/16 10:21:53 DEBUG DAGScheduler: New pending partitions: Set(0, 1, 2, 3)
17/03/16 10:21:53 INFO TaskSchedulerImpl: Adding task set 3.0 with 4 tasks
17/03/16 10:21:53 DEBUG TaskSetManager: Epoch for TaskSet 3.0: 0
17/03/16 10:21:53 DEBUG TaskSetManager: Valid locality levels for TaskSet 3.0: NO_PREF, ANY
17/03/16 10:21:53 DEBUG TaskSchedulerImpl: parentName: , name: TaskSet_3.0, runningTasks: 0
17/03/16 10:21:53 INFO TaskSetManager: Starting task 0.0 in stage 3.0 (TID 12, localhost, executor driver, partition 0, PROCESS_LOCAL, 5886 bytes)
17/03/16 10:21:53 INFO TaskSetManager: Starting task 1.0 in stage 3.0 (TID 13, localhost, executor driver, partition 1, PROCESS_LOCAL, 5886 bytes)
17/03/16 10:21:53 INFO TaskSetManager: Starting task 2.0 in stage 3.0 (TID 14, localhost, executor driver, partition 2, PROCESS_LOCAL, 5886 bytes)
17/03/16 10:21:53 INFO TaskSetManager: Starting task 3.0 in stage 3.0 (TID 15, localhost, executor driver, partition 3, PROCESS_LOCAL, 5886 bytes)
17/03/16 10:21:53 INFO Executor: Running task 0.0 in stage 3.0 (TID 12)
17/03/16 10:21:53 DEBUG Executor: Task 12's epoch is 0
17/03/16 10:21:53 DEBUG BlockManager: Getting local block broadcast_4
17/03/16 10:21:53 DEBUG BlockManager: Level for block broadcast_4 is StorageLevel(disk, memory, deserialized, 1 replicas)
17/03/16 10:21:53 INFO Executor: Running task 2.0 in stage 3.0 (TID 14)
17/03/16 10:21:53 INFO Executor: Running task 1.0 in stage 3.0 (TID 13)
17/03/16 10:21:53 DEBUG BlockManagerSlaveEndpoint: removing broadcast 1
17/03/16 10:21:53 DEBUG BlockManager: Removing broadcast 1
17/03/16 10:21:53 DEBUG BlockManager: Removing block broadcast_1
17/03/16 10:21:53 INFO Executor: Running task 3.0 in stage 3.0 (TID 15)
17/03/16 10:21:53 DEBUG Executor: Task 13's epoch is 0
17/03/16 10:21:53 DEBUG MemoryStore: Block broadcast_1 of size 5112 dropped from memory (free 384072627)
17/03/16 10:21:53 DEBUG BlockManager: Removing block broadcast_1_piece0
17/03/16 10:21:53 DEBUG MemoryStore: Block broadcast_1_piece0 of size 2535 dropped from memory (free 384075162)
17/03/16 10:21:53 INFO BlockManagerInfo: Removed broadcast_1_piece0 on 192.168.2.123:37645 in memory (size: 2.5 KB, free: 366.3 MB)
17/03/16 10:21:53 DEBUG BlockManagerMaster: Updated info of block broadcast_1_piece0
17/03/16 10:21:53 DEBUG BlockManager: Told master about block broadcast_1_piece0
17/03/16 10:21:53 DEBUG BlockManager: Getting local block broadcast_4
17/03/16 10:21:53 DEBUG BlockManager: Level for block broadcast_4 is StorageLevel(disk, memory, deserialized, 1 replicas)
17/03/16 10:21:53 DEBUG Executor: Task 14's epoch is 0
17/03/16 10:21:53 DEBUG BlockManager: Getting local block broadcast_4
17/03/16 10:21:53 DEBUG BlockManager: Level for block broadcast_4 is StorageLevel(disk, memory, deserialized, 1 replicas)
17/03/16 10:21:53 DEBUG Executor: Task 15's epoch is 0
17/03/16 10:21:53 DEBUG BlockManager: Getting local block broadcast_4
17/03/16 10:21:53 DEBUG BlockManager: Level for block broadcast_4 is StorageLevel(disk, memory, deserialized, 1 replicas)
17/03/16 10:21:53 DEBUG BlockManagerSlaveEndpoint: Done removing broadcast 1, response is 0
17/03/16 10:21:53 DEBUG ContextCleaner: Cleaned broadcast 1
17/03/16 10:21:53 DEBUG ContextCleaner: Got cleaning task CleanBroadcast(3)
17/03/16 10:21:53 DEBUG ContextCleaner: Cleaning broadcast 3
17/03/16 10:21:53 DEBUG TorrentBroadcast: Unpersisting TorrentBroadcast 3
17/03/16 10:21:53 DEBUG BlockManagerSlaveEndpoint: removing broadcast 3
17/03/16 10:21:53 DEBUG BlockManager: Removing broadcast 3
17/03/16 10:21:53 DEBUG BlockManager: Removing block broadcast_3_piece0
17/03/16 10:21:53 DEBUG MemoryStore: Block broadcast_3_piece0 of size 3309 dropped from memory (free 384078471)
17/03/16 10:21:53 DEBUG BlockManagerSlaveEndpoint: Sent response: 0 to 192.168.2.123:40909
17/03/16 10:21:53 INFO BlockManagerInfo: Removed broadcast_3_piece0 on 192.168.2.123:37645 in memory (size: 3.2 KB, free: 366.3 MB)
17/03/16 10:21:53 DEBUG BlockManagerMaster: Updated info of block broadcast_3_piece0
17/03/16 10:21:53 DEBUG BlockManager: Told master about block broadcast_3_piece0
17/03/16 10:21:53 DEBUG BlockManager: Removing block broadcast_3
17/03/16 10:21:53 DEBUG MemoryStore: Block broadcast_3 of size 6904 dropped from memory (free 384085375)
17/03/16 10:21:53 INFO Executor: Finished task 1.0 in stage 3.0 (TID 13). 912 bytes result sent to driver
17/03/16 10:21:53 DEBUG BlockManagerSlaveEndpoint: Done removing broadcast 3, response is 0
17/03/16 10:21:53 DEBUG BlockManagerSlaveEndpoint: Sent response: 0 to 192.168.2.123:40909
17/03/16 10:21:53 DEBUG TaskSchedulerImpl: parentName: , name: TaskSet_3.0, runningTasks: 3
17/03/16 10:21:53 DEBUG TaskSetManager: No tasks for locality level NO_PREF, so moving to locality level ANY
17/03/16 10:21:53 INFO TaskSetManager: Finished task 1.0 in stage 3.0 (TID 13) in 36 ms on localhost (executor driver) (1/4)
17/03/16 10:21:53 INFO Executor: Finished task 2.0 in stage 3.0 (TID 14). 912 bytes result sent to driver
17/03/16 10:21:53 DEBUG ContextCleaner: Cleaned broadcast 3
17/03/16 10:21:53 DEBUG TaskSchedulerImpl: parentName: , name: TaskSet_3.0, runningTasks: 2
17/03/16 10:21:53 INFO Executor: Finished task 0.0 in stage 3.0 (TID 12). 912 bytes result sent to driver
17/03/16 10:21:53 INFO TaskSetManager: Finished task 2.0 in stage 3.0 (TID 14) in 36 ms on localhost (executor driver) (2/4)
17/03/16 10:21:53 INFO Executor: Finished task 3.0 in stage 3.0 (TID 15). 908 bytes result sent to driver
17/03/16 10:21:53 DEBUG TaskSchedulerImpl: parentName: , name: TaskSet_3.0, runningTasks: 1
17/03/16 10:21:53 DEBUG TaskSchedulerImpl: parentName: , name: TaskSet_3.0, runningTasks: 0
17/03/16 10:21:53 INFO TaskSetManager: Finished task 3.0 in stage 3.0 (TID 15) in 36 ms on localhost (executor driver) (3/4)
17/03/16 10:21:53 INFO TaskSetManager: Finished task 0.0 in stage 3.0 (TID 12) in 45 ms on localhost (executor driver) (4/4)
17/03/16 10:21:53 INFO TaskSchedulerImpl: Removed TaskSet 3.0, whose tasks have all completed, from pool
17/03/16 10:21:53 INFO DAGScheduler: ResultStage 3 (collect at <console>:29) finished in 0.045 s
17/03/16 10:21:53 DEBUG DAGScheduler: After removal of stage 3, remaining stages = 0
17/03/16 10:21:53 INFO DAGScheduler: Job 3 finished: collect at <console>:29, took 0.097564 s
res4: Array[Int] = Array(1, 2, 3)
如何获得标准1和标准2的最大值。
非常感谢你。
答案 0 :(得分：0)
获取最大值：
$value = max($array);
获取相应的密钥：
$key = array_search($value, $array);
试试这个。