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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...

4 years 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...

4 years 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...

4 years 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...

4 years 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...

4 years ago

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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:...

4 years 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...

6 years ago | 1 answer | 0

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 ...

6 years ago | 2 answers | 1

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...

6 years ago | 3 answers | 1

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 = ...

7 years ago

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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...

7 years 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(...

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(...

7 years 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...

7 years ago | 3 answers | 3

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...

7 years ago | 1 answer | 0

Answered

join two matrices together

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

join two matrices together

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

7 years 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...

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...

7 years 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...

7 years 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...

7 years ago

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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...

7 years ago

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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.

7 years ago

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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 + ...

7 years ago

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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...

7 years 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...

7 years ago

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radius of a spherical planet

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

7 years 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...

7 years ago

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Weighted average

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

7 years ago

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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...

7 years 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...

7 years ago