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Binbin Qi


China University of Petroleum

3,613 total contributions since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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  • Combinatorics I Master
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Parsing Expressions - Binary Arithmetic Operators I
Parse and evaluate expressions like these: '1 + 2' '51 - 78' '42 * 9' The only operators are +, -, *. Both argu...

20 days ago

Solved


anshil's problem
Only anshil should solve ans = ''

20 days ago

Solved


Write a code to give student grade
Write a code to give student ' pass' grade if he/she gets more than 49 in the exam, and 'fail' grade otherwise. ''Many of lif...

26 days ago

Solved


CowBoy
A group of cowboys standing in circle form. They have one gun. The first cowboy shoot the cowboy beside him (second one) and giv...

27 days ago

Solved


Ratio between sum of primes and sum of factors
Write a function that calculates the ratio between the sum of primes numbers lower or equal to x, and the sum of the factors of ...

28 days ago

Solved


Find left eigenvector of row stochastic matrix
Find the left eigenvector of the given stochastic matrix P that has eigenvalue 1. Normalize the vector so the sum of the entri...

29 days ago

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Rearrange the given matrix to have all its zeros climb up to the top of each column - using for loops.
Given a matrix x, *using loops only* return a matrix y, in which all the zeros have "climbed" up to the top. That is, any zeros ...

29 days ago

Solved


Get the mean digit
Write a function that gives the mean digit (round towards nearest integer) of an input and positive number. For example: x ...

2 months ago

Solved


Permutation Via Multiplication
Given two numbers a and b, determine if the product ab is a permutation of the digits of a. For example, this is always true for...

2 months ago

Solved


Angle between two vectors
Given 2 pairs of _cartesian co-ordinates_, determine the angle between the 2 vectors formed by the _points_ and the _origin_. An...

2 months ago

Solved


Guess the number I'm thinking of
In this game you are competing against two other people to guess the number that I'm thinking of. # I randomly choose an *i...

2 months ago

Solved


Alternating 1´s and 0´s in a matrix
Given an odd number n, write a function that creates a matrix y with dimension nxn alternating 1's and 0's, and starting with 1 ...

2 months ago

Solved


X O X O
On a noughts and crosses board, how many possible unique combinations are there given a square grid of length n? Assumptions/...

2 months ago

Solved


Two fractions, one sum
Given a positive number x, write a MATLAB script that will tell you how many ways that the reciprocal of that number can be writ...

2 months ago

Solved


Given a matrix A return a vector of the product of the elements in each column using a loop without using prod.
--------------------- for m: 3 1 3 3 10 1 9 1 9 4 1 4 5 6 5 ...

2 months ago

Solved


Given a matrix A (size m x n) create a matrix B (size m+2 x n+2) which consists of matrix A surrounded by zeros. See Example below:
A = [1 2 3 4 5 6] ----------- B = [0 0 0 0 0 0 1 2 3 0 0 4 5 6 0 0 0 0 0 0]

2 months ago

Solved


Given a matrix A (size m x n) create a matrix B which consists of matrix A sorted in descending order by columns and then by rows.
--------------- A= [ 2 6 -3 7 12 0 -12 5 1] --------------- B= [12 7 1 6 2 0 5 -3 ...

2 months ago

Solved


Given a Vector v1, create v2 which is the sum of each two adjacent elements in v1. {length(v2)=length(v1)-1}
if v1 is [1 2 3 4 5 6 7 8] then v2 should be [3 5 7 9 11 13 15]. if v1 is [1; 3; 5; 7] the...

2 months ago

Solved


Calculate Resistance
Calculate Resistance R of a linear conductor having resistivity p, length l and area A

4 months ago

Solved


Calculate Resistance 2
In this problem, you have to calculate Resistance R of a linear conductor having voltage V across it and current I is passing i...

4 months ago

Solved


Ratio between sum of primer numbers and non-prime numbers
Write a function that calculates the ratio between the sum of the prime numbers lower or equal than x, and the sum of the non-pr...

4 months ago

Solved


Add 3 numbers
In this problem, you have to add three numbers a, b and c. Give output d = add(a,b,c)

4 months ago

Solved


Check if is a square
Given four coordinates, write a function to check if they form a square on the XY plane.

4 months ago

Solved


Easy problem
This is an easy problem. Just click on submit.

4 months ago

Solved


Sum of a geometric series
Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.

4 months ago

Solved


Double the next!
Given two numbers, m and n, find a matrix m x n where each element value is twice the value of the previous element. Starting fr...

5 months ago

Solved


Say type of roots in quadratic equation
Given the coefficients of a quadratic equation, write a function that gives the output y='RealDifferent' if the roots are real a...

5 months ago

Solved


Mean number of letters per word (Hard)
The previous problem in this series is <https://www.mathworks.com/matlabcentral/cody/problems/44852-mean-number-of-letters-per-w...

5 months ago

Solved


Mean number of letters per word (Easy)
Given a character array, s, representing a sentence, return a, the arithmetic mean of the number of letters per word in the give...

5 months ago

Solved


Cody problems in French : Trouvez la logique Pt.2
Trouvez la logique entre x et y, aidez-vous de la test suite. Bon courage. P.S: L'utilisation de "^" est de nouveau fortement...

5 months ago

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