Community Profile # Binbin Qi

### China University of Petroleum

Last seen: Today Active since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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Create a column vector of n elements between a and b (both included)
Given lower limit a and an upper limit b, create a column vector of n elements inclusive of a and b. For example: a = 1, b = 4,...

ungefär 6 timmar ago

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Gaussian elimination
Get the Gussian elimination of the Matrix Given You cannot use built-in Matlab functions triu :)

ungefär 6 timmar ago

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Find the outcast
All pairs have the same difference except for one. Output the index of the latter Example: input =[0 1; 1 0; ...

ungefär 6 timmar ago

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Count the peaceful queens
In a 5x5 chessboard with a queen of one color (white, say) on the perimeter, one can place 12 black queens on the board such tha...

ungefär 7 timmar ago

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Length of shortest path in a directed graph.
Given a directed graph and a start and end node in the graph, return the minimum number of hops required to reach the end node f...

ungefär 7 timmar ago

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Determine roll pitch yaw angles from a 3D rotation matrix
Consider an aerospace application where the world reference coordinate frame {W} and a body-fixed coordinate frame {B}. The ori...

ungefär 7 timmar ago

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determine skid distance of car
Determine the distance a car skids to a stop given initial velocity (v) and time (t).

ungefär 8 timmar ago

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Convert vector datasets to plot with imagesc instead of scatter
For large datasets this allows much faster plotting. An irregular 2D spatial sampling is provided in x and y vectors with a d...

ungefär 8 timmar ago

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Chain multiplication - 03
Following up the problem in 55305, you found the minimum number of multiplications needed to multiply a chain of matrices. In ...

ungefär 12 timmar ago

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Sum of 2 numbers in array
Given an array and a target sum, return true if any 2 numbers in the array sum up to the given target sum. Both numbers cannot h...

ungefär 13 timmar ago

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Draw 'S'
draw S using nxn matrix, where n is odd and greater than 4 S = [1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 0 0 0 0 1 ...

ungefär 13 timmar ago

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Define an arithmetic sequence
Given three numbers n, a, and d, define an arithmetic sequence of n terms with a being the initial term of the sequence and d be...

ungefär 13 timmar ago

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Return longest string in 1-D array of strings
Find the longest string in an array of strings. Return an empty string if the initial array is empty. If there are multiple stri...

ungefär 13 timmar ago

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Higher! Lower! Correct!

ungefär 13 timmar ago

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Merge structs on fields
Merge a bunch of structs into one, containing the field names and corresponding values of all input structs. For duplicate field...

en dag ago

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Undocumented MATLAB tricks No. 1 - Save a function-returned struct
Often we face the case when we want to save a function-returned struct to a mat file with each of its field as individual variab...

en dag ago

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Exhaust all possible logical vectors
Input a length argument and list all possible logical vectors of that length. My solution is of size 29. Can you find an even s...

en dag ago

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Count of Unique Elements of a Vector
Count the number of times each unique element appears in a vector. Example: Input x = [2 9 1 2 4 9 2] Output y = [1 1; 2 3; 4...

en dag ago

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Find two numbers that add up to the target value
Given a vector A and target n, return the indices of two numbers that add up to n. If there are multiple solutions, return the f...

en dag ago

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Mix it up!
Given an input string S, return a new string B, that is created by taking one character from the front and then the end iterativ...

en dag ago

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Sort vector by number of prime factors of each element
Sort a given array based on how many prime factors each term has. Sort from least to greatest and output original values. Ex: ...

en dag ago

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String Manipulator
Write a script that takes a string as an input and returns a cell array containing – I. the count of vowels. II. Find the ind...

en dag ago

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Weird Diagonal Matrix!!
**If you have loved the problem, please like it below(Request)** Given an integer n, create a matrix whose diagonal elements wi...

en dag ago

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Create a v-notch vector without "sort" function
Given a vector vec, create a v-shaped vector as shown below: vec = [ 10 2 3 89 5 7 90 0 12] Output vector = [90 89 12 10 7 5 3 ...

en dag ago

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Draw 'Y'
Draw 'Y' in an x-by-x matrix (where x is odd and x >= 3) Examples: x = 3 y = [1 0 1 0 1 0 0 1 0] x = 5 y = [1...

en dag ago

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Given an input string, generate a variable name out of it
Given an input string, generate a variable name out of it in easy to read format by a programmer. If the input string contains ...

2 dagar ago

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Draw a triangle of ones
For any given n, return a matrix that includes a triangle of ones of height n: Example n = 3 output = [0,0,1,0,0 ...

2 dagar ago

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Area of a regular hexagon
Given the length of a side of a regular hexagon, return its area rounded to two decimal places.

2 dagar ago

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string comparision
compare two strings if both are same return 1 else return 0

2 dagar ago

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Draw a X
Given an input , create a square matrix of zeros with an X of ones. Ex. n = 3 drawX(3) [ 1 0 1 0 1 0 1 0 1 ] ...

2 dagar ago