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Binbin Qi


China University of Petroleum

3 589 total contributions since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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  • First Answer
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  • Combinatorics I Master
  • Project Euler I
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  • Computational Geometry I Master
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  • Number Manipulation II Master
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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...

ungefär 22 timmar 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...

ungefär 22 timmar 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...

ungefär 24 timmar 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...

en dag 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...

2 dagar 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...

2 dagar 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...

2 dagar 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...

8 dagar 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...

26 dagar 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 ...

ungefär en månad 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...

ungefär en månad ago

Solved


Kaggle: Reverse Game of Life - Create Isle prior State
<http://www.kaggle.com/c/conway-s-reverse-game-of-life Kaggle's Conway's Reverse Game of Life> contest inspires this Isle Single...

ungefär en månad ago

Solved


Iccanobif numbers 1
There are a lot of problems in Cody that deal with Fibonacci numbers (1, 1, 2, 3, 5, 8, 13, 21 etc...) so let's turn things arou...

ungefär en månad ago

Solved


Calculate the square of a number (Super Easy)
The goal is to calculate the square (y) of a number (x). Good way to start MatLab for beginners.

ungefär en månad ago

Solved


Determine if input is odd or even
Determine if input is odd or even, sample problem

ungefär en månad ago

Solved


Twists in 2D
So far we have represented the pose of an object in the plane using a homogeneous transformation, a 3x3 matrix belonging to the ...

ungefär en månad 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...

ungefär en månad ago

Solved


Relative points in 2D: problem 3
The 2D pose of a robot, with respect to a world coordinate frame {O}, is described by a 3x3 homogenous transform matrix T. A la...

ungefär en månad ago

Solved


Relative points in 2D: problem 2
The 2D pose of a robot, with respect to a world coordinate frame {O}, is described by a 3x3 homogenous transform matrix T. A la...

ungefär en månad ago

Solved


Relative points in 2D: problem 1
The 2D pose of a robot, with respect to a world coordinate frame {O}, is described by a 3x3 homogenous transform matrix T. A la...

ungefär en månad ago

Solved


Relative pose in 2D: problem 3
The 2D pose of a robot, with respect to a world coordinate frame {O}, is described by a 3x3 homogenous transform matrix T. A la...

ungefär en månad ago

Solved


Relative pose 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 is a...

ungefär en månad ago

Solved


Method of Common Differences part-2
This is the inverse problem to <http://www.mathworks.com/matlabcentral/cody/problems/1485 Problem 1485>. Problem 1485 illustra...

ungefär en månad ago

Solved


Word Distance - Average Sort
Based on the method of <https://www.mathworks.com/matlabcentral/cody/problems/44815-word-distance-sum this problem>, write a fun...

ungefär en månad ago

Solved


Scalar Matrix Manipulation
Assume, input x is a scalar matrix such as, x = 2 0 0 0 2 0 0 0 2 th...

ungefär en månad ago

Solved


Calculate the dynamic time warping similarity
Dynamic time warping (DTW) is an algorithm for measuring the similarity between two time series that may have been acquired at d...

ungefär en månad ago

Solved


Graceful Double Wheel Graph
<http://en.wikipedia.org/wiki/Graceful_labeling Graceful Graphs> are the topic of the <http://www.azspcs.net/Contest/GracefulGra...

ungefär en månad ago

Solved


Relative pose in 2D: problem 2
We consider a world reference frame denoted by {0} which has its x-axis pointing east and its y-axis pointing north. There is a...

ungefär en månad ago

Solved


Wrecked Angles?
It's time for some simple geometry fun to start off the new year. You will be given the perimeter P and the area A of a recta...

ungefär en månad ago

Solved


Word Distance - Sum
Let's suppose that the distance of a word can be calculated by summing the differences between its letters, having assigned the ...

ungefär 2 månader ago

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