Answered
plot a signal in the freq domain
If the code is setup exactly the way you say above, then there is only one element in "f" and one element in "X". You need to do...

14 years ago | 1

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Answered
Numerical solution
Unless I misunderstood something, I think all you need to do is change: BL = 0; to if n == 1 BL = 0; end ...

14 years ago | 0

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Question

Alternative to using "unix(sprintf('ls %s/*/*/*.out',pathname))" ?
I am using the following command to gather a list of files with the same extension (*.out) down a couple directories: [~,Li...

14 years ago | 3 answers | 0

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I want to implement this matrix
>> A = zeros(4,8); >> A(:,2:2:end) = 5*eye(4,4); >> A A = 0 5 0 0 0 0 0 0 0 ...

14 years ago | 1

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Answered
DFT
Here is another (inefficient) way of saying the same thing as Wayne by way of example: Fs = 100; % samples per second dt =...

14 years ago | 0

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FFT convolution shifts resulting waveform
Yes... that can happen. If your frequency response is boosting low frequencies, then "strange" things like that can happen. Usin...

14 years ago | 0

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BER of OFDM, how scale correct after IFFT?
I use the FFT for a much different problem. In my case, the time domain data are always real and the frequency domain data are a...

14 years ago | 0

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FFT - am i doing anything wrong
Although the scaling performed on the result from FFT (in the example above, which is based on Matlab's FFT documentation) may b...

14 years ago | 0

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Accept or Reject
Here is an example. I generate a random dataset, then I cycle through each subset of data and I enter an "A" for accepting the d...

14 years ago | 0

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Accept or Reject
Yes. Search for "ginput" in your help navigator. You can even set it up so that pressing the button associated with "R" rejects ...

14 years ago | 0

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fft scalloping or window effect
Nooooo... The FFT should be scaled by the time increment (dt = 1/fs). You apply this correction to ALL the amplitudes in the fre...

14 years ago | 0

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How can the ans be surpressed so that only the fprintf will show?
Not putting a semi-colon ( ; ) at the end of a line within your code or at the end of a function call from the command line is u...

14 years ago | 0

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what is the use of the symbol '*' in the function named fullfile?
It means that any file whose name is something.jpg will be used. For example if: myFolder = '/home/yourfolder'; then ...

14 years ago | 0

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How to write the loop to collect data every step I want
You basically want to collect a sample at every 0.1 increment in time(?). Setup a counter before your "for" loop and initiali...

14 years ago | 0

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Answered
please help me identufy this.. i write the program but i dont know what this program do.. this is the command.. and output..
You are defining an array that is 1 row x 9 columns with values ranging from -9 to 11. You then calculate the "size" of the arra...

14 years ago | 0

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Answered
error-index must be a positive integer or logical.
You need to ensure all of the indices are greater than 0. When you round things (using "floor") you must be encountering values ...

14 years ago | 0

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Set the Yticklabel to different colors
This not only changes the color of the tick label, it also changes the color of the specified axis: set(h,'YTickLabel','Hat...

14 years ago | 1

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Find the centroid of a polygon
Check out: <http://www.mathworks.com/matlabcentral/fileexchange/319-polygeom-m>

14 years ago | 0

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Answered
I have a matrix q and i need the diagonal of qq'
In your Help Navigator, search for "arithmetic operators" and "diag" diag(q*q') is the same as diag(q*transpose(q))...

14 years ago | 0

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Answered
How to find a complex root from the determinate of a matrix?
Here is another example: >>a = complex(randn(1),randn(1)); b = complex(randn(1),randn(1)); c = complex(randn(1),randn(1...

14 years ago | 1

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How to find a complex root from the determinate of a matrix?
You are trying to do the following, but for almost any MxM matrix and any location of x within that matrix: Example: M =...

14 years ago | 0

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Error: Not Enough Input Arguments
A couple of questions: 1. How are you running this? If you are trying to run this from the Editor, then you will be running i...

14 years ago | 0

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FFT vs Table Fourier Pairs
Multiply your fft result by "dt". See my answer to this post for more info: <http://www.mathworks.com/matlabcentral/answers/1...

14 years ago | 1

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Answered
ifft limitations
It looks like the results are very close to being the same between column 1 and column 10: >>[z;zf] ans = Columns...

14 years ago | 0

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FFT
So, I created an example using the original un-modified code for fcoeffs_fft (located here: <http://pastebin.com/001id7SB>) and ...

14 years ago | 0

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Answered
Converting acceleration to displacement
You might need to filter your data. One of the results of going from acceleration to displacement is that you will boost low-fre...

14 years ago | 0

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How to square each element of a vector
y = x.^2; Using the "." will effectively perform element-by-element mathematical operations. So if you had 2 MxM matrices, ...

14 years ago | 20

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Answered
FFT
Ok... let's start over. I found a link to the "fcoeffs_fft" code (located here: <http://pastebin.com/001id7SB>). Are you trying ...

14 years ago | 0

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alarm for finishing running of a program
A simple way I use to get notified that processing had finished was to add a "beep" to the end of the program (I was usually in ...

14 years ago | 7

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Scaling the FFT and the IFFT
You are right about scaling being unimportant if only the shape of the spectrum is desired. However, if it is necessary that the...

14 years ago | 24