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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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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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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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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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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...

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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. Examp...

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

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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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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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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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Respondida
how can i vectorize this for loop?
You could do: n1 = numel(1:0.5:10); n2 = numel(1:0.5:5); numpl2 = repelem(1:0.5:10,n2)'; denpl2 = repmat([ones(n...

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Respondida
Plotting selected data from time series
If you want to plot the time versus the min temperature and the time versus the max temperature and if your min temperature is o...

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Pregunta

Get the line number of the last warning found ?
Is it possible to get the line number of the last warning found in order to store it and use it afterwards? As long as the |...

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respuesta

Respondida
dataset expansion keeping same values
To transform |myArray| by repeating its elements |nRepeat| times: myArray = 100*rand(1,144); % fake data nRepeat = 10; ...

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Respondida
plot a graph with two axis
You can do like this, using |yyaxis|: % fake data generation: myMatrix = [(1.2-(-0.4))*rand(20,2)+(-0.4) , sort((90-80)*...

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Respondida
How to compare a series of 50 values to a single value for each sample in a plot?
I don't know if you have your data in structure arrays, vectors or others, but is this example similar to what you want to achie...

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Respondida
When printing mfile, how to change format (font, header)?
In the Editor menu, you can change the headers properties and the font in Page setup: <</matlabcentral/answers/uploaded_files...

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Respondida
How can I store the values in a matrix while using for loop?
You have to give the position where you want to write, like this: k = 1.5:0.1:3; ws = zeros(1,length(k)); dof = zeros...

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Respondida
I have this error msg (Matrix index is out of range for deletion. Error in tray1 (line 31) x1(:,rows) = []; ) what is the problem ????
You are deleting columns of your matrix |x1| in the loop, so its size has changed (moreover, you skip some columns). To avoi...

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