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Binbin Qi


China University of Petroleum

3,607 total contributions since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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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 ...

18 hours 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 ...

1 month 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...

1 month 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...

1 month 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...

1 month 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 ...

1 month 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/...

1 month 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...

1 month 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 ...

1 month 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]

1 month 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 ...

1 month 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...

1 month ago

Solved


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

3 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...

3 months ago

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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...

3 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)

3 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.

3 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...

4 months ago

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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...

4 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...

4 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...

4 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...

4 months ago

Solved


Pose from bearing angles in 2D
A robot moving on the plane has a sensor that measures the bearing angle to two mapped landmarks, that is, the world frame coord...

4 months ago

Solved


Composing relative poses in 2D: problem 1
We consider a world reference frame denoted by {0} which has its x-axis pointing east and its y-axis pointing north. There i...

4 months ago

Solved


Just another sum (JAS)
*Task:* Write a function that takes a vector X and returns the alternating sum of X: X(1)-X(2)+X(3)-X(4)+... *Example...

4 months ago

Solved


Homogeneous lines and points in 2D: problem 1
In high school we learn the line equation y = mx + c where m is the gradient and c is the intercept. However this form is prob...

5 months ago

Solved


Generate Convolution Matrix of 2D Kernel with Different Convolution Shapes (Full, Same, Valid)
In this problem the challenge is to build the Matrix Form equivalent of the function `conv2()` of MATLAB. The function to be ...

5 months ago

Solved


Find The Difference
Vector x is given.calculate the difference between the biggest and the smallest number that we can create from elements of x. f...

5 months ago

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