A résolu


Circle area using pi
Given a circle's radius, compute the circle's area. Use the built-in mathematical constant pi.

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A résolu


Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

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A résolu


Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

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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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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...

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

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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...

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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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Réponse apportée
How do you transform a vector of numbers into a cell of strings?
Hi, one possibility: Acell = num2cell(A); B = cellfun(@(x) sprintf('%g', x), Acell, 'UniformOutput', false); Titus

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Comparing two matrix in Matlab
Hi, this question is rather tricky to answer in general. A simple approach is to compute the relative error. That works fine ...

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Create this particular SPARSE matrix to solve a quadratic program
Hi, I guess this will not work. If I take a look at M for d=16, it's 256*256 and requires (converted to sparse) about 0.12MBy...

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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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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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Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

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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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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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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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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]; and ...

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

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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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Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

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Réponse apportée
any(cell{i}) doesn't work (loop)
Could it be that you meant to write any(a{i}<0) instead of any(a{i})<0 likewise for the others ?? Titus

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Basic question regarding S function
Hi Sameer, the easist would be to use a parameter for the S-Function, read the xls file in MATLAB and pass the data as parame...

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converting 2d matrix to 3d
HI Joe, if I'm not mistaken, it should be permute(reshape(X, 512, 140, 8), [1 3 2]); Titus

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Iterations are taking too long
Hi, two things to start with: * I'm missing the initialization of U: add U = zeros(nt, nz) before entering the loop (same ...

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How to read a large text file quickly ( exceeding 20GB)
Hi Sivanand, you will be able to read the original file using fopen and textscan, because you can use textscan in a loop to r...

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Mcc in Symbolic Math toolbox
Hi Sriram, it depends: do you want to continue with the symbolic expression, i.e., do you want to do some more calculations? ...

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Embedded Matlab Function - Output for every calculation
Hi, I think there is a misunderstanding of how this works. The MATLAB code you write is executed at each time step, completel...

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