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John Doe


86 total contributions since 2013

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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...

3년 이하 ago

Solved


Is my wife right?
Regardless of input, output the string 'yes'.

3년 이하 ago

Solved


Is my wife right? Now with even more wrong husband
Again, as in "Is my wife right?" ( <http://www.mathworks.com/matlabcentral/cody/problems/149-is-my-wife-right> ), answer 'yes' r...

3년 이하 ago

Solved


Most nonzero elements in row
Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

3년 이하 ago

Solved


Distance walked 1D
Suppose you go from position 7 to 10 to 6 to 4. Then you have walked 9 units of distance, since 7 to 10 is 3 units, 10 to 6 is 4...

3년 이하 ago

Solved


Remove the vowels
Remove all the vowels in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill' Output s2 is 'Jck nd Jll wn...

3년 이하 ago

Solved


Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

3년 이하 ago

Question


Golf Recamán's sequence
Recamán's sequence described in pseudo-code is as follows: A(0) = 0 A(n) = A(n-1) - n if A(n-1) - n > 0 and is new, else...

5년 이하 ago | 0 answers | 0

0

answers

Question


Can I find out in which release a function was introduced?
Sometimes I get error messages saying stuff like: Undefined function 'savefig' for input arguments of type 'char' or ...

약 5년 ago | 2 answers | 1

2

answers

Question


x = 0:0.1:10... What's going on, really?
Please have a look at the following example: A = 0:0.1:0.4; find(A == 0.3) ans = Empty matrix: 1-by-0 fi...

5년 이상 ago | 2 answers | 0

2

answers

Solved


Swap the input arguments
Write a two-input, two-output function that swaps its two input arguments. For example: [q,r] = swap(5,10) returns q = ...

6년 이하 ago

Solved


Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

6년 이하 ago

Answered
Finding integers between two vectors
A= [4.54 5.11 9.58 15.04]; B= [1.01 3.2 5.5 16.98]; C = sort([A; B]); C(1,:) = ceil(C(1,:)); C(2,:) = floor(C(...

약 6년 ago | 0

| accepted

Question


Using bsxfun for non-numeric data
Is there an equivalent to bsxfun for non-numeric data? For example, I want to compare all pairs of strings stored in two cell...

6년 이상 ago | 2 answers | 2

2

answers

Question


Find row number of elements
Hi, I have a list of branches, |BL|, and a list of nodes, |nodeList|. BL has two columns, containing to-from nodes for each b...

6년 이상 ago | 1 answer | 0

1

answer

Answered
join two matrices together
C = reshape([A; B],177,8) Good luck! - Rob

6년 이상 ago | 1

| accepted

Answered
what is the meaning of BW = ~ BW?
It gives you back the inverted binary matrix BW. That means, all 1's turns to 0's, and vice versa. In plain text: BW = not...

6년 이상 ago | 1

Solved


Who Has the Most Change?
You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

6년 이상 ago

Solved


How to find the position of an element in a vector without using the find function
Write a function posX=findPosition(x,y) where x is a vector and y is the number that you are searching for. Examples: fin...

6년 이상 ago

Solved


Remove any row in which a NaN appears
Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

6년 이상 ago

Solved


Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

6년 이상 ago

Solved


Summing digits
Given n, find the sum of the digits that make up 2^n. Example: Input n = 7 Output b = 11 since 2^7 = 128, and 1 + ...

6년 이상 ago

Solved


Target sorting
Sort the given list of numbers |a| according to how far away each element is from the target value |t|. The result should return...

6년 이상 ago

Solved


Find the numeric mean of the prime numbers in a matrix.
There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

6년 이상 ago

Solved


radius of a spherical planet
you just measured its surface area, that is the input.

6년 이상 ago

Solved


Return the 3n+1 sequence for n
A Collatz sequence is the sequence where, for a given number n, the next number in the sequence is either n/2 if the number is e...

6년 이상 ago

Solved


Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

6년 이상 ago

Solved


Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

6년 이상 ago

Solved


Back and Forth Rows
Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

6년 이상 ago

Answered
multiplication table in matlab
Another one-liner: cumsum(meshgrid(1:10))

6년 이상 ago | 4

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