# Binbin Qi

### China University of Petroleum

Professional Interests: Machine Learning/ Math/ Geophysics

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Solved

Sort Except Zeros

Sort the numbers in a vector. But the position of zeros should not be changed. Example: sort_except_zeros( [5 3 0 0 2 4] ) == [...

2 months ago

Solved

UICBioE240 problem 1.11

Store a series of numbers into a 4 by 4 matrix, starting with the first few positions going right and down, and leaving the rest...

2 months ago

Solved

MATLAB Basics: Complex Conjugates

For a given complex number, x, return the complex conjugate, y.

3 months ago

Solved

MATLAB Basics: Complex Argument

For a given complex number, x, return the argument, y, in degrees.

3 months ago

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MATLAB Basics: Complex Numbers

For a given complex number, x, return the real and imaginary parts as a vector, y = [Real Imaginary].

3 months ago

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Matrix convolution

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

3 months ago

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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...

3 months ago

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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...

4 months ago

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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.

4 months ago

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Vector creation using linspace

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

4 months ago

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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.

4 months 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...

4 months 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...

4 months ago

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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.

4 months ago

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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...

4 months ago

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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...

4 months 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...

4 months 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...

4 months ago