grouping

问题 I have a dataframe that I want to bin (i.e., group into sub-ranges) by one column, and take the mean of the second column for each of the bins: import pandas as pd import numpy as np data = pd.DataFrame(columns=['Score', 'Age']) data.Score = [1, 1, 1, 1, 0, 1, 2, 1, 0, 1, 1, 0, 2, 1, 1, 2, 1, 0, 1, 1, -1, 1, 0, 1, 1, 0, 1, 0, -2, 1] data.Age = [29, 59, 44, 52, 60, 53, 45, 47, 57, 54, 35, 32, 48, 31, 49, 43, 67, 32, 31, 42, 37, 45, 52, 59, 56, 57, 48, 45, 56, 31] _, bins = np.histogram(data

问题 Suppose I have a group of bumper cars, which have a size, a color and an identifier ("car code") on their sides. class BumperCar { int size; String color; String carCode; } Now I need to map the bumper cars to a List of DistGroup objects, which each contains the properties size , color and a List of car codes. class DistGroup { int size; Color color; List<String> carCodes; void addCarCodes(List<String> carCodes) { this.carCodes.addAll(carCodes); } } For example, [ BumperCar(size=3, color

问题 I found in lucene 3.5 contrib folder two plugins: one is grouping, the other is facet. In my option, both of them were used to split my documents into different categories. Why lucene has now two plugins for this? 回答1: They are two different lucene features: Grouping was first released with Lucene 3.2, its related jira issue is LUCENE-1421: it allows to group search results by specified field. For example, if you group by the author field, then all documents with the same value in the author

问题 I'd like to SELECT rows from a database table and group them using PHP instead of SQL based on a parameter (in this case by item). SQL: Clothes table id item owner 1 shoes joe 2 pants joe 3 hat joe 4 pants joe 5 hat tom SELECT * from Clothes where owner='joe' 1 shoes joe 2 pants joe 3 hat joe 4 pants joe Here's how I'd like the results to look after using PHP instead of SQL's GROUP BY item PHP : 1 shoes joe 2 pants joe //count 2 3 hat joe I'm sure there is a PHP array function for this I'm

问题 We have a Student class as follows: class Student { private int marks; private String studentName; public int getMarks() { return marks; } public void setMarks(int marks) { this.marks = marks; } public String getStudentName() { return studentName; } public void setStudentName(String studentName) { this.studentName = studentName; } public Student(String studentName, int marks) { this.marks = marks; this.studentName = studentName; } } We have a LIST of Students as follows : List<Student>

问题 We have a Student class as follows: class Student { private int marks; private String studentName; public int getMarks() { return marks; } public void setMarks(int marks) { this.marks = marks; } public String getStudentName() { return studentName; } public void setStudentName(String studentName) { this.studentName = studentName; } public Student(String studentName, int marks) { this.marks = marks; this.studentName = studentName; } } We have a LIST of Students as follows : List<Student>

问题 We have a Student class as follows: class Student { private int marks; private String studentName; public int getMarks() { return marks; } public void setMarks(int marks) { this.marks = marks; } public String getStudentName() { return studentName; } public void setStudentName(String studentName) { this.studentName = studentName; } public Student(String studentName, int marks) { this.marks = marks; this.studentName = studentName; } } We have a LIST of Students as follows : List<Student>

问题 This question is very similar to this one Group Python list of lists into groups based on overlapping items, in fact it could be called a duplicate. Basically, I have a list of sub-lists where each sub-list contains some number of integers (this number is not the same among sub-lists). I need to group all sub-lists that share one integer or more. The reason I'm asking a new separate question is because I'm attempting to adapt Martijn Pieters' great answer with no luck. Here's the MWE: def

问题 Starting with an odd list of students, let’s say 21 total: cohort = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] I want use Python to write a function that assign pairs for group projects every day with different pairings. Since we have an odd number of students, I don’t want anyone to be working alone, so we would need to have 9 groups of 2 people and 1 group of 3 people . Every day they would change partners. For example, on day 1 and day 2, the groups would

问题 Starting with an odd list of students, let’s say 21 total: cohort = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] I want use Python to write a function that assign pairs for group projects every day with different pairings. Since we have an odd number of students, I don’t want anyone to be working alone, so we would need to have 9 groups of 2 people and 1 group of 3 people . Every day they would change partners. For example, on day 1 and day 2, the groups would