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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...
mer än 7 år 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...
mer än 7 år 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...
mer än 7 år 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...
mer än 7 år 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...
mer än 7 år 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:...
mer än 7 år 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...
mer än 9 år ago | 1 answer | 0
1
answerQuestion
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 ...
nästan 10 år ago | 2 answers | 1
2
answersQuestion
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...
nästan 10 år ago | 3 answers | 2
3
answersSolved
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 = ...
mer än 10 år 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...
mer än 10 år 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(...
mer än 10 år 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...
nästan 11 år ago | 3 answers | 3
3
answersQuestion
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...
nästan 11 år ago | 1 answer | 0
1
answerjoin two matrices together
C = reshape([A; B],177,8) Good luck! - Rob
nästan 11 år 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...
nästan 11 år 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...
nästan 11 år 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...
nästan 11 år 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...
nästan 11 år 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.
nästan 11 år 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 + ...
nästan 11 år 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...
nästan 11 år 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...
nästan 11 år ago
Solved
radius of a spherical planet
you just measured its surface area, that is the input.
nästan 11 år 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...
nästan 11 år 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...
nästan 11 år 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...
nästan 11 år 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...
nästan 11 år ago
multiplication table in matlab
Another one-liner: cumsum(meshgrid(1:10))
nästan 11 år ago | 4