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how to take modulus?
abs(a)^2 or norm(a)

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"Levelling" out a signal with moving average
Maybe you want to try |detrend|? doc detrend

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Why is vertcat slowing things down?
My 2 cents:: 1. You may want to preallocate the memory. The in each iteration, you just put the new data into corresponding s...

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show same text on 2 lines without getting an error
Put ... at the end of the first line, something like a = 3 * ... 4;

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Delay using FFT
I don't see anything obviously wrong in your code. I think the difference in the amplitude may just due to the fact that after t...

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plot the following functions using axes that will produce a stright line
I don't quite understand what you mean by using axes. But if you use loglog(x,y) for the first function and semilo...

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Truncating Decimal Places
round(pi)

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Solve the Sudoku Row
*Description* A simple yet tedious task occurs near the end of most Sudoku-solving algorithms, computerized or manual. The ta...

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Tell me the slope
Tell me the slope, given a vector with horizontal run first and vertical rise next. Example input: x = [10 2];

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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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