load-factor

Load factor of hash tables with tombstones

不羁的心 提交于 2019-12-11 02:23:33
问题 So the question came up about whether tombstones should be included when calculating the load factor of a hash table. I thought that, given that the load factor is used to determine when to expand capacity, tombstones should not be included. An obvious example is if you almost fill and then remove every value in a hash table. Here insertions are super easy (no collisions) so I believe the load factor shouldn't include them. But you could look at this and think that with all the tombstones

Lower / upper load factor in hash tables

风流意气都作罢 提交于 2019-12-04 06:03:18
问题 I am to write a chained hash set class in java. I understand the load factor is M/capacity where M is the number of elements currently in the table and capacity is the size of the table. But how does the load factor help me determine if I should resize the table and rehash or not? Also I couldn't find anywhere how to calculate the lower / upper load factors. Are they even needed? I hope this is enough information, Thank you!! 回答1: A single loadFactor used to configure standard Java hashes

Lower / upper load factor in hash tables

北城余情 提交于 2019-12-02 13:31:17
I am to write a chained hash set class in java. I understand the load factor is M/capacity where M is the number of elements currently in the table and capacity is the size of the table. But how does the load factor help me determine if I should resize the table and rehash or not? Also I couldn't find anywhere how to calculate the lower / upper load factors. Are they even needed? I hope this is enough information, Thank you!! A single loadFactor used to configure standard Java hashes (and in a number of hash APIs in other languages) is a simplification. Conceptually, it is reasonable to

What is the significance of load factor in HashMap?

我的未来我决定 提交于 2019-11-26 15:35:32
HashMap has two important properties: size and load factor . I went through the Java documentation and it says 0.75f is the initial load factor. But I can't find the actual use of it. Can someone describe what are the different scenarios where we need to set load factor and what are some sample ideal values for different cases? The documentation explains it pretty well: An instance of HashMap has two parameters that affect its performance: initial capacity and load factor. The capacity is the number of buckets in the hash table, and the initial capacity is simply the capacity at the time the

What is the significance of load factor in HashMap?

只谈情不闲聊 提交于 2019-11-26 04:29:13
问题 HashMap has two important properties: size and load factor . I went through the Java documentation and it says 0.75f is the initial load factor. But I can\'t find the actual use of it. Can someone describe what are the different scenarios where we need to set load factor and what are some sample ideal values for different cases? 回答1: The documentation explains it pretty well: An instance of HashMap has two parameters that affect its performance: initial capacity and load factor. The capacity