Published
Cody Hits Two Milestones
We’ve had a few exciting weeks here on MATLAB Central! A month ago we introduced a new blog, Cleve’s Corner, which is...
13 years ago
Solved
Set the array elements whose value is 13 to 0
Input A either an array or a vector (which can be empty) Output B will be the same size as A . All elements of A equal to 13...
13 years ago
Published
The Master Speaks: An Interview with Cody Champion @bmtran
Bryant Tran, better known to the Cody-playing world as @bmtran, has been the leading player on Cody since the week it...
13 years ago
Solved
Multiply 2 numbers
Very easy, you just have to multiply 2 numbers but you cannot use the following signs (*, /, - ,^) ,mtimes , times, cross, pro...
13 years ago
Problem
Twist 'n' Match
Given n and m, construct an n-by-n matrix a such that a, when rotated 90 degrees and compared with itself, matches itself in exa...
14 years ago | 9 | 85 solvers
Solved
Joining Ranges
You are given a n-by-2 matrix. Each row represents a numeric range, e.g. x = [0 5; 10 3; 20 15; 16 19; 25 25] contains...
14 years ago
Published
New Features In MATLAB Answers
We’ve just released a long list of new features in MATLAB Answers. Here’s a rundown of what’s new and what’s...
14 years ago
Solved
Matrix with different incremental runs
Given a vector of positive integers a = [ 3 2 4 ]; create the matrix where the *i* th column contains the vector *1:a(i)...
14 years ago
Solved
Project Euler: Problem 6, Natural numbers, squares and sums.
The sum of the squares of the first ten natural numbers is, 1^2 + 2^2 + ... + 10^2 = 385 The square of the sum of the first ...
14 years ago
Published
Multipoint data gathering in Trendy
When we launched Trendy, you could only grab one data point per trend. One of our very first plots, which was created as...
14 years ago
Published
June MATLAB Community Updates
In today’s post, I thought I would share fun news with you about our MATLAB community plus one tip about Trendy from a...
14 years ago
Problem
Make a run-length companion vector
Given a vector x, return a vector r that indicates the run length of any value in x. Each element in r shows how many times the ...
14 years ago | 9 | 658 solvers
Problem
Spot the outlier
All points except for one lie on a line. Which one is the outlier? Example: You are given a list of x-y pairs in a column ...
14 years ago | 15 | 474 solvers
Problem
Find a subset that divides the vector into equal halves
Given a vector x, return the indices to elements that will sum to exactly half of the sum of all elements. Example: Inpu...
14 years ago | 14 | 401 solvers
Problem
How long is the longest prime diagonal?
Stanislaw Ulam once observed that if the counting numbers are <http://en.wikipedia.org/wiki/Ulam_spiral arranged in a spiral>, t...
14 years ago | 14 | 410 solvers
Problem
Find the biggest empty box
You are given a matrix that contains only ones and zeros. Think of the ones as columns in an otherwise empty floor plan. You wan...
14 years ago | 23 | 501 solvers
Solved
Symmetric matrix
You must create a n-by-n *symmetric* matrix such that A(row,col) = row/col for col >= row. Example if n =3 : output is : ...
14 years ago
Published
MATLAB Central Release Notes – May 2012
Here is a quick list of recent MATLAB Central updates you might be interested in checking out: MATLAB Answers OR search...
14 years ago
Solved
QWERTY Shift Encoder
Encode a string using the QWERTY shift code. This code is where you touch type but are offset by one character to the right. ...
14 years ago
Solved
Reverse the Words (not letters) of a String
*Description* Change the words of a string such that the words appear in reverse order. You may assume that the string is a n...
14 years ago
Solved
Make a run-length companion vector
Given a vector x, return a vector r that indicates the run length of any value in x. Each element in r shows how many times the ...
14 years ago
Solved
Remove the two elements next to NaN value
The aim is to *remove the two elements next to NaN values* inside a vector. For example: x = [6 10 5 8 9 NaN 23 9 7 3 21 ...
14 years ago
Solved
Reindex a vector
You are given two vectors of equal length. Vector N has numeric values (no Inf or NaN) while vector IDX has integers. Place th...
14 years ago
Solved
Longest run of consecutive numbers
Given a vector a, find the number(s) that is/are repeated consecutively most often. For example, if you have a = [1 2 2 2 1 ...
14 years ago
Solved
Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...
14 years ago
Solved
Determine if input is odd
Given the input n, return true if n is odd or false if n is even.
14 years ago
Problem
Put two time series onto the same time basis
Use interpolation to align two time series onto the same time vector. This is a problem that comes up in <http://www.mathwork...
14 years ago | 6 | 350 solvers
Solved
Put two time series onto the same time basis
Use interpolation to align two time series onto the same time vector. This is a problem that comes up in <http://www.mathwork...
14 years ago
Solved
Return the first and last character of a string
Return the first and last character of a string, concatenated together. If there is only one character in the string, the functi...
14 years ago
Solved
Matrix indexing with two vectors of indices
Given a matrix M and two index vectors a and b, return a row vector x where x(i) = M(a(i),b(i)).
14 years ago