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Comparing a dataframe on string lengths for different columns

由 好久不见. 提交于 2019-12-10 14:51:43
问题 I am trying to get the string lengths for different columns. Seems quite straightforward with: df['a'].str.len() But I need to apply it to multiple columns. And then get the minimum on it. Something like: df[['a','b','c']].str.len().min I know the above doesn't work, but hopefully you get the idea. Column a , b , c all contain names and I want to retrieve the shortest name. Also because of huge data, I am avoiding creating other columns to save on size. 回答1: I think you need list

Is there any efficiency advantage in using minmax_element over min_element and max_element together?

由 我是研究僧i 提交于 2019-12-10 13:54:19
问题 std::minmax_element : returns a pair consisting of an iterator to the smallest element as the first element and an iterator to the greatest element as the second. std::min_element : returns an iterator to the smallest element in the range [first, last). std::max_element : returns an iterator to the largest element in the range [first, last). Does std::minmax_element uses sorting of complete list to achieve this? Is the overhead of processing returned pair from std::minmax_element worthy

Using Min, Max and Count on HQL

由 ⅰ亾dé卋堺 提交于 2019-12-10 13:32:32
问题 Does hibernate HQL queries support using select min, max, count and other sql functions? like: select min(p.age) from person p Thanks 回答1: Yes, min() , max() and count() are supported in HQL. see aggregate functions in the Hibernate Doc. 回答2: thats how I am using max in Hibernate : public long getNextId(){ long appId; try{ Session session = HibernateUtil.getAdmSessionFactory().getCurrentSession(); Transaction t = session.beginTransaction(); String sequel = "Select max(JAdmAppExemptionId) from

Efficient way to find min value in Map

由 为君一笑 提交于 2019-12-10 13:16:14
问题 I am trying to find key with minimum value in Map shown below. Map<Node, Integer> freeMap = new TreeMap<>(); Node minNode = null; for (Map.Entry<Node, Integer> entry : freeMap.entrySet()) { if (minNode == null) { minNode = entry.getKey(); } else { if (entry.getValue() < freeMap.get(minNode)) { minNode = entry.getKey(); } } } Firstly, Is there a straight forward way to find key with minimum value than using foreach loop. Secondly, can you suggest some alternate data structure approach which

Oracle - With a one to many relationship, select distinct rows based on a min value

由 孤街醉人 提交于 2019-12-10 12:12:58
问题 This question is the same as In one to many relationship, return distinct rows based on MIN value with the exception that I'd like to see what the answer looks like in other dialects, particularly in Oracle. Reposting from the original description: Let's say a patient makes many visits. I want to write a query that returns distinct patient rows based on their earliest visit. For example, consider the following rows. patients ------------- id name 1 Bob 2 Jim 3 Mary visits ------------- id

T-SQL: Finding the closest location of an object on a map grid

由 心已入冬 提交于 2019-12-10 10:34:16
问题 I have grid showing on a map. I know your location and the location of 2 objects on the map. Objects appear where grid lines cross. Consider the world flat and not round since the area on the map is only a short distance. I want to determine which object is closest to you without using trigonometry and multiplication for performance reasons. I'm not looking for accuracy as much as just getting a ballpark indication. I should be able to determine the shortest distance between the difference in

min(column) is not returning me correct data of other columns

由 扶醉桌前 提交于 2019-12-09 22:58:39
问题 Below is what I have +++++++++++++++++++++++++++ id + myDate + name +++++++++++++++++++++++++++ 'A'+ '2012-06-05' + 'baz' 'A'+ '2012-06-04' + 'bar' 'B'+ '2012-06-05' + 'foo' 'C'+ '2012-06-05' + 'bla' 'C'+ '2012-06-04' + 'blah' 'C'+ '2012-06-06' + 'bleh' +++++++++++++++++++++++++++ Query I am using is SELECT id, min(myDate) as Date, name FROM myTable GROUP BY id; I am getting output as below +++++++++++++++++++++++++++ id + myDate + name +++++++++++++++++++++++++++ 'A'+ '2012-06-04' + 'baz' 'B

Python-How to determine largest/smallest int/long/float/complex numbers my system can handle [duplicate]

由 爱⌒轻易说出口 提交于 2019-12-09 12:45:07
问题 This question already has answers here : Maximum and Minimum values for ints (8 answers) Closed 6 years ago . Specs: Python 3.3.1 What I was trying to do: "Using Python, determine the largest and smallest ints, longs, floats, and complex numbers that your system can handle." What I did: I went through Python's math modules and all built-in functions relating to math and numbers, but couldn't find a way to do this. I also tried something like max(range(0,)) but it returned ValueError: max()

How to find min/max values from rows and columns in Python?

由 ￣綄美尐妖づ 提交于 2019-12-09 02:10:30
I was wondering how can I find minimum and maximum values from a dataset, which is basically a text file. It has 50 rows, 50 columns. I know I can set up a control loop (for loop to be specific) to have it read each row and column, and determine the min/max values. But, I'm not sure how to do that. I think the rows and columns need to be converted to list first and then I need to use the split() function. I tried setting something up as follows, but it doesn't seem to work: for x in range(4,50): # using that range as an example x.split() max(4,50) print x New to Python. Please excuse my

jquery UI slider min/max values

由 别说谁变了你拦得住时间么 提交于 2019-12-08 21:23:13
问题 HI guys I have one simple question. Can I put text min/max values for jquery ui slider and when scroll to appear digits? Here is an example, the left slider for max value has "no limit" and when you scroll it, appear digits. 回答1: You are looking for the range slider. I hope the range slider demo helps. The min and max values can be set while initialising the slider. Edited Sorry for misunderstanding the question. If you look at the source code of the demo you will see a small script that
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