Question

MOD bug? Or something else?
Seems to be a bug in *MOD*. The values inside the range from 0 to 1 that should result in *MOD* of 0 (or 0 to machine precision...

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looking for an efficient way to activate all fprintf in the function
Probably not what you are looking for, but a quick way may be to just do a search and replace all (i.e., search for: "fprintf" r...

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How to manipulate Plot Legend to show markers and colours seperatly?
It can be done... you will have to do some finagling, but it can be done. Here is an example where we have 2 different datasets ...

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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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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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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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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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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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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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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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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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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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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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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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Is my wife right?
Regardless of input, output the string 'yes'.

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Love triangles
Given a vector of lengths [a b c], determines whether a triangle with non-zero area (in two-dimensional Euclidean space, smarty!...

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How to check if a file of certain type exists in folder?
You could try doing something like: dir_struct = dir( fullfile(your_path,'*pdf') ); if numel(dir_struct) == 0 % then ...

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Plotting lognormal data on this type of graph?
The key ended up being *norminv*. Here is an example output of the program I made (see below for *probit* function): >> pro...

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Question

Plotting lognormal data on this type of graph?
I would like to plot data on a graph similar to that illustrated in the figure below (except it is upside-down from my conventio...

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I have a rather large matrix. The data was sampled at 100 Hz. I want to the data to look like it was sampled at 5 Hz
Use *resample* - This is an example of why you may not want to take every Nth amplitude: <<https://lh5.googleusercontent.com/...

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use FFT in matlab and get phase plot
Here are the frequencies associated with the output from FFT: Nt = % Number of time samples Fs = ...

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Area of a Spectrum
The area under your curve should just be: N = numel(x); dt = 1/fs; df = fs/N; y = fft(x)*dt; area_y = sum(abs(y))*d...

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How to get back complete signal after doing IFFT
Can you provide an example of how you are performing the fft? Something like: a = your_dataset_in_the_time_domain; size_a ...

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How to run 3D FFT?
Have you checked out *fftn*?

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ifft and fft problem
Did you mean to use "fs_s" instead of "f_s" here: h1_s_hat = abs(fs_s.*ifft(ifftshift(h1_s_FT))); I guess that's why you...

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