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Qin-Yong


Last seen: 6 maanden ago Active since 2020

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Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

9 maanden ago

Solved


Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Examp...

9 maanden ago

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Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

9 maanden ago

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How close to a hole
Suppose you have a description of good places (ones) and bad places (zeros). You want to know your distance from a bad place (in...

9 maanden ago

Solved


Split array into pieces according to corresponding array
An array x of length n has values 1...m with each value appearing at least once. The values are sorted (n>=m). A second...

9 maanden ago

Solved


Find the distance between runs
Another question inspired by the <http://uk.mathworks.com/matlabcentral/answers/?s_tid=gn_mlc_an answers forum>: A vector of ...

9 maanden ago

Solved


Find Elements in Range
Based on a question on <http://www.mathworks.com/matlabcentral/answers/ MATLAB Answers>. Find all the elements of a vector wh...

9 maanden ago

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Find indices of diagonal elements
Given a matrix A and a diagonal index d (where 0 indicates the main diagonal and off-diagonals are identified by positive and n...

9 maanden ago

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How to reverse spdiags ?
The spdiags function extracts all nonzero diagonals from the m-by-n matrix A. So if A=[1 2 3;4 5 6;7 8 9], spdiags(A)=[7 4...

9 maanden ago

Solved


Neither minima nor maxima
Input v is a vector. Return all the elements of v which are not a local minimum or maximum. Example: v = [1 2 3 4 5] Ou...

9 maanden ago

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Elements with highest local average
Input v is a row vector such that length(v)>3. Consider a sliding window of length 3 that is used to calculate the local average...

9 maanden ago

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Combine Data With Gaps
Combine data sets a and b where the datasets have "gaps" or unique points. Example: Input a = [1,0; 2,1; ...

9 maanden ago

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Find the same and successive values in a vector
Find the same and successive values in a vector. For example: Input x = [ 1 0 0 1 1 1 1 0 1 1 1 0 0 0 1 ] Start and end...

10 maanden ago

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Longest Sequence of NaNs
In an array return the length of longest sequence of nans for each column. x = [ 2 3 1 2 5 6; nan nan 5 n...

10 maanden ago

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Sum My Indices
Given inputs M and N (in that order), output an MxN matrix whose entries are equal to the sum of their indices. Example input...

10 maanden ago

Solved


Hard limit function
Classify x data as if x>=0 then y=1 if x<0 then y=0 Example x = [ -2 -1 0 1 2] y = [ 0 0 1 1 1]

10 maanden ago

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Index one element in each vector of an array along a given dimension
Functions like min and max can return in their second output argument the index of the element in each vector along a particular...

10 maanden ago

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Sort numbers by outside digits
Sort the array so that they are sorted as if their value was a 5 digit number made from the first three and last two digits of t...

10 maanden ago

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Index of a Rational number
The set of real numbers are infinite. They are so many that real numbers can't even be enumerated. However, unlike real numbers ...

10 maanden ago

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Tridiagonal
Return an n-by-n matrix that has a, b, c as the subdiagonal, main diagonal, and superdiagonal entries in the matrix. Example ...

10 maanden ago

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Find the maximum two numbers of every column of a matrix
Find the maximum two numbers of every column of a matrix. Example: If we input a matrix A = [ 1 2 4 6 0 3 ...

10 maanden ago

Solved


Finding neighbors of [-1:1] in a matrix....
Hello All! Well I found this one fun to figure out, all you have to do is make a matrix of 1's or 0's (true or false) that sh...

10 maanden ago

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How unique?
Sometimes, when we check unique entries of vector we would like to know how many times each value occurs. Given vector of num...

10 maanden ago

Solved


Another colon problem
This is simple problem based on problems 555, 801, 1118, etc. Create an index vector from two input vectors. Example: ...

10 maanden ago

Solved


return row and column indices given 2 values which define a range
Inspired by problem <http://www.mathworks.co.kr/matlabcentral/cody/problems/856-getting-the-indices-from-a-matrice> Inputs: - ...

10 maanden ago

Solved


Sum of odd numbers in a matrix
Find the sum of all the odd numbers in a matrix. Example x = [2 3 5 7 1 4 11] y = 27

10 maanden ago

Solved


Find the index of n in magic(n)
If input n=5, then magic(n) is 17 24 1 8 15 23 5 7 14 16 4 6 13 20 22...

10 maanden ago

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Replace pattern 0 1 0 and 1 0 1
Find and replace a pattern in a row of zeroes and ones. * Find 1 0 1 and replace it with 1 1 1 * Find 0 1 0 and replace it w...

10 maanden ago

Solved


Largest territory
Determine whose territory is largest. If there are multiple numbers tied for the largest territory, return the smallest number. ...

10 maanden ago

Solved


counting groups!
This problem is about counting groups. Example If you have x: x = [0.8 0.8 0.8 0.3 0.3 0.4 0.5 0.6 0.6 0.9] then a...

10 maanden ago

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