# John Doe

Active since 2013

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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...

bijna 8 jaar ago

Solved

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

bijna 8 jaar ago

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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...

bijna 8 jaar ago

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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...

bijna 8 jaar ago

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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...

bijna 8 jaar ago

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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...

bijna 8 jaar 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:...

bijna 8 jaar 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...

meer dan 9 jaar ago | 1 answer | 0

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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 ...

ongeveer 10 jaar ago | 2 answers | 1

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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...

ongeveer 10 jaar ago | 3 answers | 2

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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 = ...

meer dan 10 jaar 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...

meer dan 10 jaar ago

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(...

bijna 11 jaar 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...

ongeveer 11 jaar ago | 3 answers | 3

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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...

ongeveer 11 jaar ago | 1 answer | 0

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

ongeveer 11 jaar ago | 1

| accepted

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...

ongeveer 11 jaar 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...

ongeveer 11 jaar 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...

ongeveer 11 jaar 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...

ongeveer 11 jaar 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.

ongeveer 11 jaar 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 + ...

ongeveer 11 jaar 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...

ongeveer 11 jaar ago

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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...

ongeveer 11 jaar ago

Solved

you just measured its surface area, that is the input.

ongeveer 11 jaar ago

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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...

ongeveer 11 jaar 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...

ongeveer 11 jaar 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...

ongeveer 11 jaar 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...

ongeveer 11 jaar ago