Large homework collection

r Language ：
requirement
Will use Excel Sort out the original data provided 、 Put it in order - A data
1
Set , And read in R As - A data frame , For statistical analysis to be carried out
use .
Student source quality analysis : The quality of students can be compared with that of the current year through the scores of the college entrance examination
One . This score line ( nothing - - Provinces in this line can use the score line of independent enrollment ) Of
2
Differences to reflect . Please analyze the science and engineering admitted in each province by year 、 Students of literature and history
Quality of students , Compare the same - - Is there any significant difference in the quality of students in the two years in the province
2019 New student enrollment data for students to complete the course
change . Through descriptive statistical analysis , Combine visualization to express your
2020 Enrollment data of Freshmen in - Students end the class with
Conclusion , Try to use the methods we have learned .
Analysis of students' characteristics : The gender of students enrolled in each major shall be counted by year 、 year
3
age 、 nation 、 The current and previous 、 Political outlook and other data and proportions , And make use of
Visual representation of the learned methods .
mathematics 、 Analysis of foreign language single subject performance : The number of students admitted to each major by year
4
learn 、 Descriptive statistical analysis of foreign language scores , Combine the visualization effect to show
Now your conclusion , Try to use the methods we have learned .
The map shows : (1) Use the map of China , Set up... At the location of the provincial capital
5
Set icon , Click to show 2020 Annual enrollment and minimum score .(2) In use
A map of China , Set a circular label at the location of the provincial capital , Move the mouse to the
Show... In the area 2019 Annual enrollment and minimum score .

It needs to be added qq1975728171

data structure C Language ：

* Lesson design task 2: The application of Huffman tree
◆ Functions and requirements :
1. Read a large block of text from a file ( character , Does not contain special characters #), Count the frequency of different characters
degree ( percentage ), Store these characters and the corresponding frequency statistical results in the file . Read the frequency from the file and press this
Create Huffman tree with frequency .
2. Create a Huffman tree and save it in a file hfimTree in ( Store in sequence , Node structure ( A weight , double
Pro - , Left , Right )); Display the Huffman tree in memory on the terminal in an intuitive way ( For example, you can use the concave table of the tree
Display the Huffman tree on the screen ).
3. Use the built Huffman tree ( If not in memory , From the file htmTree Middle reading ), For each character
Huffman code , And save the encoding result in another - In a file .
4. Output the... Of the Huffman tree WPL value .
5. Enter another... From the keyboard - Segment character , Perform the following processing on the characters that appear : If a character is not in ha
In the ffman code table , Then the character remains unchanged ; If exist , Then binary coding is carried out according to the Huffman code determined above
Replace ; Save the encoding results in the file ( The character encoding or the original characters in the file can be separated by # Separate ), meanwhile
Also displayed on the terminal .
6. Read out the Huffman encoded result from the file and then decode it , Get the original body content and display it
Show output .
● explain : The concave representation of the tree is mainly used for the screen or printout of the tree , The basic idea of its expression is : Output from
The root node starts , Then output each subtree from left to right : Brothers are equal in length , A node is not less than its child node
The length of . Binary tree can also be expressed in this way , Suppose the length of the leaf node is 1, The length of a non leaf node is equal to its left
The sum of the lengths of the right subtree .

It needs to be added qq1975728171

python：
Python Major operation requirements and instructions
-、 The goal is
The goal is to develop professional practical projects , Through big homework , send
Students have the ability of project analysis and design , And have good programming skills
force .
Two 、 Knowledge content
1. code
Use PyCharm、Spyder or IDLE And so on Tools .
(2) Follow code specification and code performance optimization ; ;
(3) Be able to skillfully use debugging technology in the process of coding .
Write standard software functions and design documents .
3、 ... and 、 The basic requirements
It is required to complete the analysis and design process of a small project , And report
It's reflected in . The basic requirements are as follows :
Complete an information management system : Store data in a file or data
In the data table of the library , And can add relevant data 、 modify 、
Delete 、 Inquire about 、 Statistical analysis and other related functions .
Be careful :
(1) When adding and modifying data , To check the validity of the data
sex ;
(2) Use the exception handling structure , Enhance the robustness of the program .
Four 、 Topic selection and results submission
(1) Topic selection . Recommended items can be used for large assignment questions , It's fine too
Choose your own topic , The difficulty and workload of topic selection are moderate . Suggest 1~2
Students complete a topic ,2 One person - The division of labor shall be clearly defined when organizing , Everyone finish
Become a part of the task .
(2) Submit results . Submit on the network teaching platform 1 Copy source program and
Data files ( It is required to operate normally )、1 Share Python Big job design
file . Print a paper version Python Big job design document .
5、 ... and 、 Introduction to recommended projects
This design provides the following items for students to choose , And provide some functions to
seek
1. College English vocabulary learning system
(1) Project description : It is required to design a college English vocabulary learning system ,
Implement input 、 Inquire about 、 Show 、 Maintenance and other module functions .
(2) The basic requirements
① Use a friendly user interface ;
② Data maintenance function : Realize input 、 Add and modify vocabulary
Content ;
③ Query statistics function : Set multiple query methods .
(3) Select the module : Properly join the system password management 、 Data preparation
And other functions .
2. Teacher information management system
(1) Project description : Design teacher information management system , Realize the output
Enter into 、 Inquire about 、 Show 、 Maintenance and other functions .
(2) The basic requirements :
① User interface friendly ;
② Data maintenance function , Realize input 、 Add and modify teacher letters
Rest ;
③ Query statistics function , Set multiple query methods , To achieve the goal of teachers
The teaching situation of 、 Workload statistics, etc .
(3) Optional requirements : Properly join the system password management 、 Data preparation
And other functions .
3. Student management information system
(1) Problem description : Design student management information system , Learning from each other .
Management of health information .
(2) The basic requirements :
① User interface friendly ;
② Data maintenance function , Realize input 、 Add and modify students into
performance ;
③ Query statistics function , Set multiple query methods , Realize to students
And so on .
(3) Optional requirements : Properly join the system password management 、 Data preparation
And other functions .
4. Student dormitory management system
(1) Problem description : This project mainly completes the management of students' dormitories and the division
Configuration work .
(2) The basic requirements :
① User interface friendly ;
② Data maintenance function , Realize input 、 add to 、 Browse and modify learning
Student's accommodation letter , Rest ;
③ Inquire about : Student accommodation information inquiry, etc .
(3) Optional requirements :
① Students apply for 、 Repair request feedback query, etc ;
② Administrator login : Administrator login authentication , After the verification is passed , root
Perform background operations according to the permissions of the administrator role , Then you can
To complete the query of student information of each dormitory 、 A letter of application from students in each dormitory
Information and feedback after maintenance , Finally, I can make statistics - Some basic letters
5. The book management system
Still working .
(1) Problem description : This project mainly completes book management and borrowing
(2) The basic requirements :
① User interface friendly ;
② Data maintenance function , Realize book information input 、 add to 、 Browse
And modify ;
③ Inquire about : Book information inquiry, etc .
(3) Optional requirements :
① Reader information maintenance ;
② Borrow books 、 Book return subsystem .
6. Hotel Management System
(1) Problem description : The project mainly completes the routine management of the hotel
(2) basic requirement :
User interface friendly ;
Role management : Identity management for administrators and customers
Data maintenance function : Realize the basic information of the hotel , Room information
The input of 、 add to 、 Browse and modify ;
Query function : Realize the regular query function of rooms ;
Accommodation management : Room reservation 、 Check in Management 、 Check out management 、 junction
(3) Optional features :
Realize the monthly management of the hotel , Annual financial data statistics .
6、 ... and 、 Evaluation rules for major operation items
1. Human computer interaction must be realized , Be able to connect to the database or
file , Realize the database management / Addition, deletion, modification and query of data stored in the file
do . This part of the function has not been completed , It is rated as “ fail, " achievement .
2. There is no graphical interface operation , The basic rating is “ pass ” achievement ,
If the function is completed very well , Adjust it to “ secondary " achievement .
3. Realize graphical interface , But it only implements the addition and deletion of databases or files
Change query operation , Less functions are realized , The basic rating is “ secondary ” achievement .
4. The graphical interface layout is beautiful 、 Well designed , In the implementation of the database
Or the basis of document addition, deletion, modification and query . On , The project has complete functions , basic
It is rated as “ good " achievement .
5. In the meet “ good " On the basis of the basic requirements for grading , Added to
The application of autonomous learning knowledge and technology , Good completion , Basic rating
by " good ’” achievement .
6. The project needs to be completed by individuals or groups . The final information is incomplete 、 straight
Copy others' projects 、 Know nothing about the completed project , Are judged as not
pass ,2 One person - Group time , Due to the reduction of per capita workload , Relative to independence
The scores of the completed students will be reduced appropriately .
Refer to the above requirements for self selected topics , Be sure to consult with the teacher before confirming
set .
<>
3、 ... and