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# Binbin Qi

### China University of Petroleum

Last seen: 1 day ago Active since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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Draw 'P' !!!
Draw a n by n matrix 'P' using 0s and 1s. (n is odd and greater than 4) if n=5 , then the output will be [1 1 1 1 1 1 0 0 0...

3 days ago

Solved

Find the summation, mean, median, mode and standard deviation of a given array.
An array is given. Find out the summation, mean, median, mode and standard deviation of a given array. If x=[1,2,2,3,3,3,4,4,4,...

3 days ago

Solved

Sum of two number using (regexp, varargin) comand?
Sum two number a &b and get there result in c using the rexp and varargin comand.

6 days ago

Solved

Draw matrix 'Swiss flag'( Euro 2020)
Draw a x-by-x matrix 'Swiss flag' using '0' and '1'.(x is odd and bigger than 4) Example x=5 ...

6 days ago

Solved

Easy Sequences 5: Project Euler Problem 1 - Again!
We are all familiar with Project Euler Problem 1. This time let's try it on bigger multiples and larger range. Find the sum of ...

6 days ago

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Easy Sequences 4: Eliminate the Days of Confusion
If a date is written in purely numeric format some dates can be confusing, if we don't know the date format used. For example, "...

6 days ago

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Easy Sequences 3: Prime 44-number Squares
The positive integers 62 and 238 are related. Their squares (3844 and 56,644) both end in '44'. In fact, 62 and 238 are the 3rd ...

7 days ago

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Easy Sequences 2: Trigonometric function with integral input and output
The function 'F', defined as: , will always return an integer if the input is a natural number (in radian...

8 days ago

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Easy Sequences 1: Find the index of an element
The nth element of a series is defined by: . Obviously, the first element . Given the nth element , find the value of the corre...

8 days ago

Solved

Total resistance of resistors in parallel
What is the total resistance of a number of resistors in parallel? A vector R contains the resistances (in Ohm) of n resistors,...

9 days ago

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Total resistance of resistors in series
What is the total resistance of a number of resistors in series? A vector R contains the resistances (in Ohm) of n resistors, w...

9 days ago

Solved

Basic: fft
Calculate the value using fft

9 days ago

Solved

UICBioE240 problem 1.12
The mathematical quantities e^x, ln x, and log x are calculated in Matlab using the expressions exp(x), log(x), and log10(x), re...

10 days ago

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Leftovers? Again?!
I am thinking of a positive number X. To determine what number I am thinking of, I will give you two 1xN vectors. The first ve...

10 days ago

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Find the largest number
Find the largest number |x| among 4 numbers given as variables |a|, |b|, |c|, and |d|. Example: Input: a = 4; b = 7; c ...

10 days ago

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Create a vector
Create a vector from 0 to n by intervals of 2.

10 days ago

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make histogram
You probably know the function hist(x,n) to get the histogram. Now try to write the function yourself! For the cheaters wanting...

10 days ago

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A little bit of luck needed
This one may require a little bit of guess work, but it is possible. Hints: - The same solution might fail the tests once and ...

10 days ago

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ICFP2021 Hole-In-Wall: Calculate Score
The ICFP held its annual 3-day contest in July 2021 with Hole-In-Wall. Contest Specification. The contest folds the figure in R...

10 days ago

Solved

Which Prime
Given two prime numbers, specify the relation between them i.e. - 'Twin Prime', 'Cousin Prime', 'Sexy Prime' or 'None'

10 days ago

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Create array of all Distances between two Sets of Points
This Challenge is a subsection of Martian Pranks based on Tim's efficient Distance calculation between sets of points. Given Po...

11 days ago

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Find the maxmum value of N*N Matrix
Input x=[1 2 3; 4 5 6; 7 8 9] output: y=9

12 days ago

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Sum the rows
Sum the rows of the given matrix. Example x = [ 1 2 3 4 ] y = [ 3 7 ]

1 month ago

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Plotting Practice
Plot cos(x) vs x as shown in the figure below. Include the appropriate title, x-label, and y-label. Note, it is case sensitive. ...

2 months ago

Solved

arrayfun bomb

2 months ago

Equivalent of c++'s NULL or python' s None in MATLAB
I think you can use class.empty for null in matlab classdef A < handle properties empty = A.empty; end end...

2 months ago | 0

Solved

Divisible by n, prime divisors (including powers)
For this problem, you will be provided an array of numbers (not necessarily in order). Return the array of numbers with only pri...

3 months ago

Solved