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Binbin Qi


Last seen: 5 days ago

China University of Petroleum

4,043 total contributions since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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Solved


What is the current time in Darwin, Australia?
Traders need to track exchange calendars and trading hours in detail, and account for time zone differences and daylight savings...

19 days ago

Solved


Function minimization - global minimum
Sequel of problem 45951 <https://www.mathworks.com/matlabcentral/cody/problems/45951> Can you do even better, within the r...

19 days ago

Solved


Function minimization - beat fminbnd!
Matlab's fminbnd function finds a minimizer of a function within an interval. If often gets stuck in local minima. Can you do...

19 days ago

Solved


Function minimization - beat fminsearch!
Sequel of problem 45948 <https://www.mathworks.com/matlabcentral/cody/problems/45948-function-minimization-beat-fminbnd> M...

19 days ago

Solved


Longest run of consecutive numbers (★★★★★)
(copy of Problem 672) Given a vector a, find the number(s) that is/are repeated consecutively most often. For example, if you...

1 month ago

Solved


Let's create histogram data by yourself.
We'd like to create histogram data, which first column shows the data, and second column shows the frequency. input = [1, 2, ...

1 month ago

Solved


Flag a convertible string
If a string is able to be entirely converted to an integer, return a "true" flag. Otherwise, return a false flag. For example: ...

2 months ago

Solved


How to locate the position of an element in a vector without using the find function
(copy of prob 105 with test for find function) Write a function posX = *locatePos* (x,y) which returns the location o...

2 months ago

Solved


Vector of digits (★★)
Given a positive integer x, construct a vector y with all the digits of x in the order of appearance in x. Thus, if x = 172...

2 months ago

Solved


GPA
Math's credit is 5 and you got x | Physics's credit 7 and you got y what is your GPA

2 months ago

Solved


counting sequence
A counting sequence is formed by "counting" the entries in a given sequence.

2 months ago

Solved


Percentage
There is x liter water and y gram => z is percentage of salt in water

2 months ago

Solved


Matrix indexing with two vectors of indices (★★)
(copy of Prob 589) Given a matrix M and two index vectors a and b, return a row vector x where x(i) = M(a(i),b(i)). Thus, if...

2 months ago

Solved


Reindex a vector (★★)
(copy of Prob. 676) You are given two vectors of equal length. Vector N has numeric values (no Inf or NaN) while vector IDX h...

2 months ago

Solved


Get the elements of diagonal and antidiagonal for any m-by-n matrix (★★★★)
(copy of prob. 859) In this problem you must submit a solution which returns the diagonal and anti-diagonal elements without ...

2 months ago

Solved


Compute the Bernoulli numbers
The <https://en.wikipedia.org/wiki/Bernoulli_number Bernoulli numbers> appear in several applications in number theory, includin...

2 months ago

Solved


Extract leading non-zero digit (★★★★★)
(Copy of Problem 47) Benford's Law states that the distribution of leading digits is not random. This is probably because man...

2 months ago

Solved


How many points lie within the rectangle and how many aren't?
Suppose, you are given the coordinates of bottom-left and top-right corners of a rectangle as *input-1, R* i.e *R=[Bottom-left c...

2 months ago

Solved


Bto
Hangisi daha büyük

2 months ago

Solved


DETERMİNE bigger input
which one is biigger x or z

2 months ago

Solved


Calculate the volume of a cone
Calculate the volume of a cone given an array containing one column of radii and one column of the height of the cone. * Reme...

2 months ago

Solved


Triangle Numbers (★★)
(copy of problem 5) Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3...

2 months ago

Solved


Make a checkerboard matrix (★★★★★)
(copy of Prob. 4) Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1...

2 months ago

Solved


sumdigits
function [p1,p2] = goldbach(n) for p1 = 1:n if isprime(p1) p2 = n - p1; if isprime(p2) re...

2 months ago

Solved


Sort even numbers from 1 to 100
Sort even numbers from 1 to 100 for ex: x=1:100

2 months ago

Solved


Times 7
Try out this test problem first. Given the variable x as your input, multiply it by seven and put the result in y. Example...

2 months ago

Solved


Times 6
Try out this test problem first. Given the variable x as your input, multiply it by six and put the result in y. Examples:...

2 months ago

Solved


Which one is More bigger?
we have two input like (x,y) our output (z) must wich one is bigger input.

2 months ago

Solved


Replicate elements in vectors (★★★)
(copy of Prob 867) Replicate each element of a row vector (with NaN) a constant number of times. Examples n=2, A=[1 2...

2 months ago

Solved


Remove the row average (★★★)
(copy of Prob. 963) Given a 2-d matrix, remove the row average from each row. Your solution MUST be vectorized. The solut...

2 months ago

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