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# Binbin Qi

### China University of Petroleum

3.737 total contributions since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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leap year
find the number of leap years within the given time interval

3 dagen ago

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Last non-zero digit
Given a number n, find the last non-zero digit of the factorial of that number. You need to take care of the large values of n....

9 dagen ago

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Positive Definiteness of a Matrix
Determine if input matrix is positive definite or not.

9 dagen ago

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Find index of non empty cell array
This question aims to understand the characteristics of MATLAB programs. Educational problem. Please find empty index of cell...

15 dagen ago

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MinMax
* x=[2 4 3 1 6 4 6] * output , y=[1 6 2 4 3] here,y(1) is the minimum of x, y(2) is the maximum of x, y(3) is the 2nd mini...

17 dagen ago

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Find the Best Hotels
Given three input variables: * |hotels| - a list of hotel names * |ratings| - their ratings in a city * |cutoff| - the rat...

24 dagen ago

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Find the centroid of triangle
Imagine that you want to calculate the *centroid* of some _triangles_ given in matrix form. First the coordinates of the vertice...

28 dagen ago

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Calculate triangle area
Imagine that you want to calculate the areas of some triangles given in matrix form. First the coordinates of the vertices of th...

28 dagen ago

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Solve Sudoku puzzle step by
Sudoku is a famous puzzle. <https://en.wikipedia.org/wiki/Sudoku> Give a standard sudoku by a matrix (9*9), You need give a ...

28 dagen ago

Problem

Solve Sudoku puzzle step by
Sudoku is a famous puzzle. <https://en.wikipedia.org/wiki/Sudoku> Give a standard sudoku by a matrix (9*9), You need give a ...

28 dagen ago | 0

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Find the sequence
Find the nth number of a sequence. Check the test suite to determine the sequence. * hint: it is closely related to familiar ...

ongeveer een maand ago

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Zero
given an integer a, find the smallest possible integer b(b>0) such that their bitwise logical AND is zero. * if a=11(1011) t...

ongeveer een maand ago

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Subdivide the Segment
Two points, P1 and P2, with integer x-y coordinates are given. These uniquely determine a third point, P0, on the extended line...

ongeveer een maand ago

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Remove duplicated vertices
First input V_in is a vertices list (X Y Z coordinates) which may contain duplicata (identical rows). Second input T_in is th...

ongeveer een maand ago

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Rotate a matrix without using rot90
rotate the input square matrix by certain degrees (e.g. 270 or 450 etc.) without using rot90 or flip function. its an extension...

ongeveer een maand ago

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Query edges list
Input T is a triangulation connectivity indices list (triplet list of indices -positive integers-, each index refering to a vert...

ongeveer een maand ago

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Find neighbor triangle indices
First input T is a triangulation (triplet list of indices -positive integers-, each index refering to a vertex number in a corre...

ongeveer een maand ago

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Query a vertex neighbors
First input T is a triangulation connectivity indices list (triplet list of indices -positive integers-, each index refering to ...

ongeveer een maand ago

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Find triangles from edge
First input is T, a Triplet list of indices -whom each row actually contains the three indices of a triangle vertices-. size(T) ...

ongeveer een maand ago

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Remove duplicated triangles
Input T is a triangulation (triplet list of indices -positive integers-, each index refering to a vertex number in a correspondi...

ongeveer een maand ago

Solved

ongeveer een maand ago

Solved

Query every vertices neighbor indices
Input T is a <https://fr.mathworks.com/help/matlab/ref/triangulation.html triangulation>. The purpose of this function is to ...

ongeveer een maand ago

Solved

Alternate list of elements
Write a function that combines two lists by alternating the elements, e.g. ['a','b','c'], ['1','2','3'] → 'a1b2c3'.

ongeveer een maand ago

Solved

ongeveer een maand ago

Solved

This problem is <https://www.mathworks.com/matlabcentral/cody/problems/45252 Restricted Addition v1> with more restrictions. Als...

ongeveer een maand ago

Solved

Add two numbers without use of common arithmetic operations. Unfortunately, in order to enforce this restriction, other restrict...

ongeveer een maand ago

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Frugal number
check whether n is a frugal number

ongeveer 2 maanden ago

Solved

The length of the equal sides of an isoceles triangle is 'a'.For all the possible (integer) values of the remaining side,find the associated angles between the two equal sides.
the remaining side may have many possible values.only assume integer ones for simplicity.

ongeveer 2 maanden ago

Solved

An n-sided regular polygon is drawn within a circle whose radius is 'r', what will be the area of the polygon?
area of a polygon is p*a/2. where, p is the perimeter and a is the apothem i.e. the normal distance from center to any of the ...

ongeveer 2 maanden ago