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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...

12 years ago

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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...

12 years ago

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how to stop the running program
Ctrl + C It'll work in most cases. You can change the key mapping in your MATLAB preferences.

12 years ago | 0

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Is my calculation too complex for Matlab?
As Bjorn mentioned, since they're periodic they may have many solutions. However if I remember the solve command right, I think ...

12 years ago | 0

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Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

12 years ago

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colorbar position on imageplot with multiple figures
Colorbars are associated with a particular axis. If you do not specify which axis, then it will be added to the last one you use...

12 years ago | 0

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imshow update in realtime, colorbar causing it to slow down
You can make visualizations inside of loops more efficient by using handle graphics to update the underlying data rather than re...

12 years ago | 1

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is there a version of Principle Component Analysis for images?
I don't know much PCA myself, but I know we have some built-in tools in Statistics and Wavelet toolboxes that may be of use: ...

12 years ago | 0

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What's the difference between imagesc and imshow?
|imshow| has a number of default settings intended for displaying images, such as turning off the axes and locking the aspect ra...

12 years ago | 2

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Making a splash Screen for my Gui program
Search for 'splash screen' on the MATLAB File Exchange, there are a number of entries that can do this for you. <http://www.m...

12 years ago | 0

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Who is the smartest MATLAB programmer?
Who is the smartest MATLAB programmer? Examples: Input x = 'Is it Obama?' Output = 'Me!' Input x = 'Who ?' Ou...

12 years ago

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Test harnesses and reference models
First I would double check that you are using virtual vs non-virtual buses where appropriate. There's a good blog post here t...

13 years ago | 0

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High CPU usage when matlab is idle on Linux
Have you rebooted your Linux machine since July 1? If not then that may be the problem. There was a bug with Linux that caused a...

13 years ago | 4

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The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

13 years ago

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Create times-tables
At one time or another, we all had to memorize boring times tables. 5 times 5 is 25. 5 times 6 is 30. 12 times 12 is way more th...

13 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...

13 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...

13 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...

13 years ago

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Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

13 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...

13 years ago

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Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

13 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...

13 years ago

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Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

13 years ago

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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. Example...

13 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...

13 years ago

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Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

13 years ago

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Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

13 years ago

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

13 years ago

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Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

13 years ago

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Add two numbers
Given a and b, return the sum a+b in c.

13 years ago