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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. Examp...

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; ...

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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...

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Alphabetize by last name
Given a list of names in a cell array, sort the list by the last name. So if list = {'Barney Google','Snuffy Smith','Dagwood ...

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The Goldbach Conjecture
The <http://en.wikipedia.org/wiki/Goldbach's_conjecture Goldbach conjecture> asserts that every even integer greater than 2 can ...

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Find common elements in matrix rows
Given a matrix, find all elements that exist in every row. For example, given A = 1 2 3 5 9 2 5 9 3 2 5 9 ...

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Pangrams!
A pangram, or holoalphabetic sentence, is a sentence using every letter of the alphabet at least once. Example: Input s ...

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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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Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

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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...

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

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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 ...

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Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

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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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Find the peak 3n+1 sequence value
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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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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How to create body centered cubic structure?
You could create 2 different X/Y/Z combinations, each for corners and centre of the lattice. Then plotting them one after the ...

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matconvnet in online matlab
The problem is that since 'mex' command is not yet supported in Matlab Online, you cannot compile the source code as mentioned i...

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How can I solve 6 different first order ODEs (Three DOF) with ODE45 in three different conditions
I'm not sure which script contains your constraints. In general, you may try writing a third script to invoke the first two from...

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how to build a histogram from an output with 2 vectors
Hi Heg, It seems that you haven't posted the code where the 'ga' algorithm is running and the results are obtained. In general...

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Making a circle with circles
Hi Nicholas, I'm assuming you want smaller circles (r=1) to be arranged in a circular shape, i.e. where they form the perimente...

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unable to find function / Previously accessible file
Hi Malgorzata, Instead of saving the strings to a .m code file and executing that code, I suggest using eval() to have them po...

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What is the logic behind timedelaynet?
I belive this page explains the basic concepts. Wikipedia Entry You may read the following research papers to get a better u...

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how to change dot notation to if else if structure, with while and for loops.
I'm not certain what sort of 'dot notation' is in question here. The '.' - dots in your code are multiplication operators. In M...

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Matlab code for PRESENT and HIGHT
You may explore MATLAB File Exchange for such implementations. File Exchange is a platform for Matlab users to publicly share ...

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Function calling and executing from different .m files
Hi Jay, As an alternative, you may try saving the initialized matrix to disk (typucally as a .mat file) and loading it in the s...

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how to calculate classification accuracy
Hi Reen, I'm not sure which method you want to use for calculating an accuracy value, but here's one approach we may try: % ou...

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how to generate indices for the training data for all the possible combinations in leave n out cross validation?
Hi Harshan, You may use 'cvparition' function with 'leaveout' option specified. Have a read of the doc: https://www.mathwork...

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Multiply a column by -1, then do something. Do this for all possible combinations of the matrix
Hey Diego, I think you can attempt this problem using logical indexing. It's often faster to group all the combinations into a ...

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partially reduced row echelon form
Hey Christoph, You may try using the 'fast rref' function created on File Exchange by Armin Ataei. It may perform faster than ...

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