Table of Contents
The link to reproduce the question: https://buuoj.cn /challenges
Reference link: 2019CISCN web question contest-JustSoSo;love_math (reproduction)
2019 National College Stu
Category: Mathematics
Applied Mathematics is a general term for mathematical theories and methods with a clear application purpose. The study of how to apply mathematical knowledge to the branches of mathematics in other categories (especially science) can be said to be the opposite of pure mathematics. Including differential equations, vector analysis, matrix, Fourier transform, complex analysis, numerical methods, probability theory, mathematical statistics, operations research, control theory, combinatorial mathematics, information theory and many other branches of mathematics, as well as from various application fields The study of the mathematical problem presented. Computational mathematics can sometimes be regarded as part of applied mathematics.
Treat data dropwear using a characteristic vector PCA using a covariance matrix.
Take 2-dimensional features to facilitate graphic display
import matplotlib.pyplot as plt
from sklearn.decomposition import PCA
from sklearn.datasets import load_iris
data = load_iris()
View Find File Command
Command to view the specified number of lines in the file tail command (to view the data at the end of the file) 1 #The content at the end of the output file, 10 lines by default
2 tail date.l
Syntax – Is it easier to write recursive drop parsers using EBNF or BNF?
I have a grammar for BNF and EBNF. BNF is obviously more verbose. As far as building a recursive descent parser using BNF, I have a pretty good idea; there are many resources for me. Could not find
Math – Find the intersection between two vectors in matlab
I have a very simple MATLAB question. What is the easiest way to find the intersection between two vectors. I am not familiar with various MATLAB functions-it seems there should be one like this. <
Mathematics – Is it unknovable?
Don’t you know if the two functions are the same? For example, a compiler writer wants to determine whether two functions written by a developer perform the same operation. What methods can he use
Event stream —- Event bubble and event capture
Sometimes I have mixed feelings, but I have a lot of arguments. Those far away things seem to be yesterday,
Event flow-event bubbling and event capture
First of all, when we are talking
Sorting algorithm (third bomb) sorted by sorting and base (barrel)
Merge and sort
Sorting animation demo
The overall effect:
span>
Sorting details:
The principle of sorting:
Merge sorting means recursively splitting the original
Search a 2D Matrix
Question leetcode: Search a 2D Matrix | LeetCode OJ lintcode: (28) Search a 2D Matrix Problem Statement Write an efficient algorithm that searches for a value in an _m_ x _n_ matrix.
This
[Computer room test] Matrix
Find the number of n*m 01 matrices that meet the following conditions:
(1) There is exactly one 1 in the i-th row and columns 1 to li.
(2) There is exactly one 1 in the ri~m column of the i-th ro