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# Binbin Qi

### China University of Petroleum

Last seen: 1 giorno ago Active since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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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...

4 giorni 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...

8 giorni 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...

18 giorni 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.

18 giorni ago

Solved

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

18 giorni 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.

18 giorni 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...

18 giorni 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...

18 giorni ago

Solved

Function - Cylinder Surface Area
The goal

20 giorni 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.

20 giorni ago

Solved

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

27 giorni 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...

28 giorni 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...

circa un mese ago

Solved

Sales Tax

circa un mese 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...

circa un mese 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...

circa un mese ago

Solved

List the titles of Cody problems

circa un mese ago

Solved

Solve an ODE: equation A

circa un mese ago

Solved

Flip coins

circa un mese ago

Solved

Logic 11

circa 2 mesi ago

Solved

Similar triangles

circa 2 mesi ago