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Binbin Qi


Last seen: Today

China University of Petroleum

4,845 total contributions since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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  • Cody 5th Anniversary Finisher
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  • Knowledgeable Level 2
  • Thankful Level 1
  • First Answer
  • Logic
  • Computational Geometry I Master
  • Matrix Patterns II Master
  • Personal Best Downloads Level 1
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  • Introduction to MATLAB Master
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Solved


Matrix convolution
A certain convolution step involves an elementwise multipication between two 3x3 matrices and taking the resulting sum of the el...

15 hours ago

Solved


Matrix Indexing
Given a matrix A and scalars r,c,i, find the product of two elements, with the first element located at row r and column c (doub...

5 days ago

Solved


Stacking vectors into a matrix
Given a 4x1 vector a, and a 2x2 matrix b, create a matrix M in which the first 2 rows are each identical to a and the last two r...

14 days ago

Solved


Vector creation using colon operator
Create a vector y containing n uniformly spaced values between a and b, with a < b. Use the colon (:) operator.

14 days ago

Solved


Vector creation using linspace
Create a vector y containing n uniformly spaced values between a and b, with a < b. Use linspace.

14 days ago

Solved


Logarithmically spaced vector creation using logspace
Create a vector y containing n logarithmically spaced values between a and b, with a < b. Use the logspace operator.

14 days ago

Solved


Logarithmically spaced vector creation using linspace
Create a vector y containing n logarithmically spaced values between a and b, with a < b. Avoid using logspace and use the linsp...

14 days ago

Solved


Right shift an array n times with constant space.
Right shift an array n times with constant space, that is, no extra array can be used. Right shift operation: Last element com...

14 days ago

Solved


Function - Cylinder Surface Area
The goal

16 days ago

Solved


Find the number of days in a given year
Given a year number (eg. 2000) as input, find how many days are there in the given year.

16 days ago

Solved


Find the sum of the following series
A(n)=(n*(n-1)!)/(n-2)!

24 days ago

Solved


Count unique orderings of vertices of a polygon
Cody Problem 2671 asks us to determine whether four points can be the corners of a rectangle. The points are not necessarily inp...

25 days ago

Solved


Create the flag of Ramumbia
The little known nation of Ramumbia has a very simple flag. It is made up of vertical stripes, Red, Green, Blue, that are equall...

27 days ago

Solved


Sales Tax

27 days ago

Solved


Sum the Infinite Series II
For any x in the range 0 < x and x < 2*pi radians, find the sum of the following infinite series: c = 1 + 1/2*cos(x) + 1/2*3...

27 days ago

Solved


Count alternating permutations
In an alternating permutation of numbers 1 to n, the numbers are arranged so that they alternately increase and decrease. For ex...

1 month ago

Solved


Solve an ODE: equation A

1 month ago

Solved


Flip coins

1 month ago

Solved


Logic 11

2 months ago

Solved


Similar triangles

2 months ago

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