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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...

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

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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...

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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...

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Can I improve visually a GUI?
This is the IDE's view. The GUI, when you run it, could be a little better. And decide whether you need all the components in th...

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How to identify buses used within a model
find_system(ModelName,'BlockType','BusCreator'); Be sure to turn follow links, look under mask in your find system query..

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Where the variables,methods and classes are declared in MATLAB.?
I am afraid, your question is a bit to vague to answer. Either attach the files or post lines of code. But if your script works,...

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Execute code if m-file runs into error
use try and catch at all suspect instances. This will solve your case. But when you call a blob a script, it should not have ...

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write a MATLAB program to determine the n^th number in the Fibonacci sequence
Homework ain't it? There is a question on the same in Cody. <http://www.mathworks.in/matlabcentral/cody Check out..>

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How to extract a period of history of a signal in simulink?
You can use a group of Unit Delay Blocks to do the same. That precisely does what you want.

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In GUI how to take input from keyboard?
this is GUI's DE(development Environment). Run the GUI by clicking on the Green Play button at the menu. The GUI will execute. t...

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how to mention picoseconds unit of time.
Do you mean this? ps='*1e-12'; eval(['30',ps])%30 picoseconds ans = 3.0000e-011

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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...

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Trimming Spaces
Given a string, remove all leading and trailing spaces (where space is defined as ASCII 32). Input a = ' singular value deco...

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Which doors are open?
There are n doors in an alley. Initially they are all shut. You have been tasked to go down the alley n times, and open/shut the...

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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...

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Use string as a path
No.. dirs is a cell array of strings. Type whos and you will see dirs ...

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how to determine the rows and columns of an image ?
save your imread data in some variable. ImageData=imread('car.jpg'); ImageData will be a 3 D array for Colour Image with...

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Right and wrong
Given a vector of lengths [a b c], determines whether a triangle with those sides lengths is a right triangle: <http://en.wikipe...

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Back to basics 6 - Column Vector
Covering some basic topics I haven't seen elsewhere on Cody. Given an input vector, output true or false whether it is a colu...

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Accurately Insert a Block in Simulink Model based on Mouse Position.
Hi, I want to insert a Block into a Simullink Model from Right Click Menu. The block should be inserted into the exact 'positio...

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Nearest Numbers
Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...

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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...

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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 + ...

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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...

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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...

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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...

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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 ...

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First N Perfect Squares
*Description* Return the first N perfect squares *Example* input = 4; output = [ 1 4 9 16 ];

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Back to basics 21 - Matrix replicating
Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix, generate an output matrix that consists o...

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