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remove nans fast
There are several ways to locate and remove nans in a matrix, and return an 1d row vector. In this problem the challenge is ...

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Insert structure in a parameter-cell array.
When creating Matlab GUI elements, you can mix value pairs with structures in the list of input arguments, e.g. |uicontrol('t...

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Check if it is a square or cube of consecutive numbers
Check whether the element of given row vector is a square or cube of consecutive numbers. For example Input x=[4 27 16 25 36 3...

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Wrap a vector, but insert NaN's at the wrap-positions.
When you plot a line that wraps, and do not want the sawtooth shape to show up in the plot, you can either draw all separate lin...

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Schrödinger dog
Everyone knows that dogs are less unpredictable than cats. But is that proven? Is that measurable at all? YES! NOW IT IS! ...

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Reassign cell contents to empty variables, preserving cell content data type
Given a cell array C, return a cell array D with the following specifications: 1. D has the same size as the input C. 2. E...

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Write a cubic formula function
Create a function that will output the three roots of a cubic equation specified by the 4 coefficients listed as input. The outp...

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Get input and output variable names
Given a string representing a function header, return the variable names used for the inputs and outputs. For example if input ...

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LIFO Validation
Write a function to check whether a LIFO (Last In First Out) restriction on inventory is violated. We have two input vectors ...

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Fixed-Point Iteration
Perform fixed-point iteration to estimate the root of a nonlinear equation.

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Get ranking of a combination
I have the numbers pulled without replacement from the set [1 2 3 4 5 6 7 8 9 10 11 12 13]; They are then ordered from least to ...

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Create a v-notch vector without "sort" function
Given a vector vec, create a v-shaped vector as shown below: vec = [ 10 2 3 89 5 7 90 0 12] Output vector = [90 89 12 10 7 5 3 ...

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Primes for Large N: 2^30, System Memory Limit
This Challenge is to further improve the "primes" function for speed/memory usage to the Limit of Cody Memory. The Matlab fun...

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Primes Faster for Large N
This Challenge is to improve the "primes" function for speed. This may be accomplished by fixing memory usage. The Matlab fun...

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Determine which fields have been modified in a structure
Given two input structures (s1, s2), determine which field values have been modified in s2 compared to s1. Your output should be...

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Return elapsed time
Write a function that returns the amount of time it takes to run the function, as measured by tic and toc. Your answer must be c...

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Pandiagonal Prime Magic Square Verification
Verify if an NxN matrix is a Pandiagonal Prime Magic Square. Required properties: 1) N^2 prime values ( No repeats, 1 ...

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Find the minimum element of the matrix
Example: If x = [3 9; 5 2] then y = 2

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Number of digits in an integer
Specifies how many digits in a given integer. Example: in=100 ==> out=3

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Find the function
Given a set of point (x,y) and the coordinate x of a new point, find the y value of new point.

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Mean ignoring NaNs
Define a function that behaves in the same way as mean(x) and mean(x,d) except that it ignores NaNs (unless all of the values be...

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Vector LCM
Find Least Common Multiple of a given vector. Need general solution as the test suite will be expanded. Function Template: fu...

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Infinite precision division
Develop a function that will divide a very very large integer numerator, supplied to function as a string (e.g., '12233344445555...

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A stroll on the beach: finding a route round a connected region
You are standing on the beach of an island, which you must explore by walking all the way round its coast. Each step is in one o...

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Cody Computer Part 3 - Detect the graphic card used on Cody Computer
In the Cody computer investigation party, you may have already solved : Problem 522. Cody Computer Part 1 - Guess the system fo...

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Bang Bang in Bangalore
Imagine a strange language disorder, Bangolangosis, has developed among trigonometricians of <http://en.wikipedia.org/wiki/Banga...

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Closely related?
Given a function past_records() that will report blood sugar level of two twin brothers some random number of days ago. For exam...

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Grandpa's telescope
Two grandkids Dorothy and Benjamin are sharing a telescope made by their grandpa, who used an old lens of spectacles as the obje...

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Toolbox check part 3
In my ongoing quest to highlight obscure parts of MATLAB, the latest challenge is to take 2 string inputs, one a MATLAB toolbox ...

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Project Euler: Problem 4, Palindromic numbers
A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 ...

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