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

14 years ago | 0

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

14 years ago | 0

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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...

14 years ago | 1

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

14 years ago | 0

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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...

14 years ago | 0

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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...

14 years ago | 0

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Truncating Decimal Places
round(pi)

14 years ago | 2

Solved

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

14 years ago

Solved

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

14 years ago

Solved

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

14 years ago

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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 =...

14 years ago

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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, ...

14 years ago

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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...

14 years ago

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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...

14 years ago

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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...

14 years ago

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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']; ...

14 years ago | 0

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

14 years ago | 0

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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

14 years ago | 1

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Answered
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...

14 years ago | 0

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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 ...

14 years ago | 0

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

14 years ago | 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 ...

14 years ago | 0

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

14 years ago

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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...

14 years ago

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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.

14 years ago

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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 = ...

14 years ago

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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 ...

14 years ago

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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...

14 years ago

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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...

14 years ago | 0

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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

14 years ago | 0