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iFFT for Band-pass Measurement
You cannot reconstruct your timeseries unless you have either: 1. Complex values for both positive and negative frequencies. ...

13 years 前 | 0

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Square wave Chirp
Here is an example: signal_length = 20; % length of signal in seconds wave_length = 2*pi; % wavelength of rectangle pulse in ...

13 years 前 | 1

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Constraining a fitted curve
Here is an example using "pchip": a = sort(rand(1,15),'ascend'); b = sort(rand(1,15),'ascend'); x = a(1):0.001:a(end); y...

13 years 前 | 0

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SDOF FRF (FFT) Magnitude discrepancy
I ended up copying your code and running with some modifications. Looks like it will work a little better if you make the sugges...

13 years 前 | 0

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code to implement FSK on sin wave
Someone else did the work for you here: <http://www.edaboard.com/thread133432.html>

13 years 前 | 0

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deploytool
You need the MATLAB compiler to do this

13 years 前 | 0

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How to show partial legend in figure
To take your first example: h = zeros(1,3); h(1) = plot([1:10],'Color','r','DisplayName','This one');hold on; h(2) = plot...

13 years 前 | 14

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genetic programming
Maybe check this out: <http://www.mathworks.com/matlabcentral/fileexchange/13680>

13 years 前 | 0

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Check if matrix has two identical rows
If you want to remove identical rows, then B = unique(A,'rows'); As a check, if size(B) ~= size(A), then you have at least two...

13 years 前 | 1

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FRF magnitude calculation
Or... if you want the magnitude and the input data is really just two columns of numbers(second column not specifically formatte...

13 years 前 | 0

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Changing color of single bars in a bar plot
See Jonathan's answer here: <http://www.mathworks.com/matlabcentral/answers/20860-how-to-use-colormap-for-different-bars>

13 years 前 | 1

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How to write comments defining the elements in a 2d array?
>> Yj = rand(3,4) Yj = 0.5447 0.4239 0.1753 0.2433 0.2167 0.8710 0.1654 0.1209 0.8463 ...

13 years 前 | 0

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How can I display 0.0001 as it is, not 1.000e-4
fprintf('%6.4f',myNum) The 6 reserves 6 places including the decimal, the 4 is how many digits to the right of the decimal to...

13 years 前 | 2

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Reading Time/Dates from Excel
I tried creating my own XLS document with date info in column A and time info in column B: 11/9/2010 9:00:00 11/10/2010 10...

13 years 前 | 0

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Median() ignoring zeros
Or without for-loop: B = arrayfun(@(k)median(A(A(:,k)~=0,k)),1:size(A,2));

13 years 前 | 0

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how can i blur an image by removing high frequencies of it's DFT
I modified an example I posted earlier. It generates a random 2D image and then applies a simple low-pass filter (i.e., sets hig...

13 years 前 | 0

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Problem with multiple for loops
So after you run the code above (and assuming you initialized "p = 0;" before the code) you get "p" still equal to 0 after the c...

13 years 前 | 0

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fft2 function in matlab
The 2D case is associated with double integration... so the 1D case is single integration. The above answer will simplify down t...

13 years 前 | 4

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fft2 function in matlab
Here is a quick example. I assume a random 2D image where the horizontal axis (columns) represents data collected in space domai...

13 years 前 | 15

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How to use the Output function of a Cubic Spline Interpolation?
Example: x = 0:10; y = 5 + 3*x.^2; pp = spline(x,y); int_y = quad(@(xx)ppval(pp,xx),x(1),x(end));

13 years 前 | 2

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reading dates and time
Also a neat trick with reading date/time info: date_str = '03/01/2006,08:00:00,40.10,40.42'; date_serial = datenum(date_str,'...

13 years 前 | 0

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solve two equations for two unknown variables
G*m = d G = [f1,f2;f3,f4]; d = [z1;z2]; m = G\d; x = m(1); y = m(2);

13 years 前 | 0

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Numerical packing
UGLY/BRUTE-FORCE: I assumed you were trying to minimize the standard deviation of your group sum AND the difference between your...

13 years 前 | 1

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How to work out if there is a cyclic element to data
As a rough start, you can try correlating the time series with sections of itself. For example: % User defined inforation le...

13 years 前 | 0

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read large amount of formatted data
Looks like a similar problem to the one answered here: <http://www.mathworks.com/matlabcentral/answers/23351-parsing-complicate...

13 years 前 | 0

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Generate Square Wave
This should work: dt = 1e-9; % time increment (in seconds) maxtime = 200e-6; % maximum length...

13 years 前 | 0

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Generate Square Wave
signal_length = 20e-6; % length of signal in seconds wave_length = 1.2e-6; % wavelength of rectangle pulse in seconds amplit...

13 years 前 | 0

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Data Frequency Transformation
Try interpolation! doc interp1 Here is an example using "interp1" with the method set to "spline": T = 60*8; % max ...

13 years 前 | 0

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Deleted questions
Last time I noticed this, the person had deleted it inadvertently. Very frustrating. However, I am sure that there are some that...

13 years 前 | 1

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Good evening
This was answered yesterday... You will have to save this in your working directory: <http://www.mathworks.com/matlabcentral...

13 years 前 | 0