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surface of a spherical planet
you just discovered its circumference, that is the input.

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De-dupe
Remove all the redundant elements in a vector, but keep the first occurrence of each value in its original location. So if a =...

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Elapsed Time
Given two date strings d1 and d2 of the form yyyy/mm/dd HH:MM:SS (assume hours HH is in 24 hour mode), determine how much time, ...

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Distance walked 1D
Suppose you go from position 7 to 10 to 6 to 4. Then you have walked 9 units of distance, since 7 to 10 is 3 units, 10 to 6 is 4...

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Remove the vowels
Remove all the vowels in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill' Output s2 is 'Jck nd Jll wn...

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Factorize THIS, buddy
List the prime factors for the input number, in decreasing order. List each factor only once, even if the factorization includes...

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matlab coding
OK, the question becomes more concrete now. Since you have A0 and A1, then you can do A = [A0 A1]; B = [A0*A0' A1*A1']; ...

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Plot of 3D Matrix
You can |mesh| or |surf| doc mesh doc surf

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Numerically solve for x in a polynomial equation
Write the polynomial as a*x^3+b*x^2+c*x+d-y Then you can use |fzero| to solve x. doc fzero

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How do i intergrate a signal (sinewave)?
|int| is the symbolic toolbox integration. There are many numerical integration methods in MATLAB, just pick one of them. d...

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frequency ulation
You can do an FFT to the output of the mixer to find the beat frequency. You can then convert beat frequency to the range using ...

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Change Pixel intensity value
Say your image is |x|, x(x<0) = 0;

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signal processing
You can us |xcorr| to do both auto and cross correlation, e.g., xcorr(x,x) xcorr(x,y) doc xcorr Auto correlation ...

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Arrange Vector in descending order
If x=[0,3,4,2,1] then y=[4,3,2,1,0]

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Remove DC
Input x is the sampled signal vector, may have both AC and DC components. Output y should not contain any DC component. Examp...

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Find the sum of the elements in the "second" diagonal
Find the sum of the elements in the diagonal that starts at the top-right corner and ends at the bottom-left corner.

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Swap the input arguments
Write a two-input, two-output function that swaps its two input arguments. For example: [q,r] = swap(5,10) returns q = ...

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Omit columns averages from a matrix
Omit columns averages from a matrix. For example: A = 16 2 3 13 5 11 10 8 9 7 ...

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Is my wife right? Now with even more wrong husband
Again, as in "Is my wife right?" ( <http://www.mathworks.com/matlabcentral/cody/problems/149-is-my-wife-right> ), answer 'yes' r...

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area under curve for just 1 period
There are many integration methods in MATLAB, just pick one of them. doc quad doc quadl doc integral I'll use |qu...

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Algorithm used in [d,l] = bwdist(I)
You can look at the references listed in Algorithm section of the doc doc bwdist

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Gaussian Distribution
This is really just plotting an equation, for practical purpose, you can plot from -4*sd to 4*sd. Let's say mu is the mean, ...

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non zero elements above 70 and below -70 zero
Use logical index x(x>70 | x<-70)=0

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Histogram Peak
You can use |findpeaks| function in Signal Processing Toolbox doc findpeaks

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Project Euler: Problem 1, Multiples of 3 and 5
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23...

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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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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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exponential random draws and the seed
What's your version of MATLAB? setGlobalStream is introduced in R2011a, try RandStream.setDefaultStream(s)

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making a function work
Maybe the path is messed up, what is 'ThePathName'? I'd suggest to put calc_avg on the path, then cd to the directory where the ...

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Using find command on each term in a vector
Not really a syntax for find, but take advantage of arrayfun a = -10:10; b = 22*rand(1,30)-11; c = arrayfun(@(x) find...

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