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# Carlos

### Universidad Politécnica de Valencia

Active since 2012

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Answered
Calculating frequency of a sine wave with varying frequency
Look at this page http://www.mathworks.es/es/help/signal/ref/spectrogram.html

nästan 9 år ago | 0

Answered
help solving string question
a=[1 2 3 4 5]; >> b=zeros(1,length(a)); count=1; l=length(a); while(count<=l) b(count)=a(l+1-count); count=c...

nästan 9 år ago | 0

Answered
How to sort all the columns of a file into a single column?
Try reshape(A,numel(A),1)

nästan 9 år ago | 1

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Answered
How to find frequency components from a signal?
Your question is perhaps too generic, however to find frequency components of a signal in Matlab the FFT command is braodly used...

nästan 9 år ago | 1

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Answered
How do I make a master script that can call other scripts?
Imagine you have the following 3 different .m files function y=master(a,b) y=y1(a)+y2(b); function y=y2(b) y...

nästan 9 år ago | 0

Answered
introducing the function in Matlab
Probably you have not stored the function in your working directory.Just change your working directory to the directory where yo...

nästan 9 år ago | 0

Answered
fft: significant peak in 0 Hz component
From your code and the file uploded I can see ypur sampling frequency is 1000 Hz and you are trying to represent frequencies up ...

nästan 9 år ago | 1

Answered
fft: significant peak in 0 Hz component
You are right, the 0 Hz component is DC mean component Try something like x=x-mean(x); y = detrend(x,'constant') ...

nästan 9 år ago | 0

Answered
Dirac function and matlabFunction
The problem is this line of the code dirac(x + 0.5, 1), dirac only allows one argument. Why do you include the second parameter ...

nästan 9 år ago | 0

Answered
Hello,how can I separate the audible samples from unaudible or less audible samples in audio file. I want to hide my secret message in less audible samples on the basis of frequency. So basically how can I find the frequency of samples.
The human ear can hear signals within 20 Hz to 20 kHz range. So you can apply a bandpass filter in this frequency range. If you ...

nästan 9 år ago | 0

Answered
increment values which are larger than three
Try A=[ 2 1 3; 4 2 5; 1 1 6] a=find(A>3); A(a)=A(a)+1

nästan 9 år ago | 1

Answered
How can I implement FFT (y-axis:Power, x-axis:Frequency) with 4 cases: Lowpass/Highpass/Band/Notch
If you want to filter a signal in the frequency domain you just need to multiply your signals' frequency response (y in your cod...

nästan 9 år ago | 0

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Answered
psd of any signal
Try something like this N = length(x); xfft = fft(x); psdx = (1/(2*pi*N)).*abs(xfft).^2; freq = 0:(2*pi)/N:2*pi-(2...

nästan 9 år ago | 0

Answered
FINDING MAX FREQUENCY OF A EARTHQUAKE DATA
If you just need to find the maximum frequency, you could calculate the fourier transform and find out the highest frequency con...

nästan 9 år ago | 0

Answered
Calculation the coordinate of a point
I will give you some clues You have points (x1,y1)(known) and point (x2,y2) (unknown),so you have two unknown variables, so y...

nästan 9 år ago | 0

Answered
Regarding distance determination in an ellipse from a matlab ( 2013) plot
In the case you are not working with a large number of plot you can use the ginput command (you place the mouse in a point and M...

nästan 9 år ago | 0

Answered
How to convert matlab .m code into simulink model ?
Have a look at this http://www.mathworks.es/es/help/simulink/ug/creating-an-example-model-that-uses-a-matlab-function-block.h...

nästan 9 år ago | 0

Answered
Please can you help me do the following. Where a k and B are positive constants
If a, k and B are constants just asign the value they have and solve, there is no need to declare them as a syms variable. ...

nästan 9 år ago | 0

Answered
Hey guys I'm new to MAT LAB.
The way signals are generated here http://www.mathworks.es/es/help/matlab/ref/fft.html is what you are looking for.The only para...

nästan 9 år ago | 0

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Answered
How to measure pitch period. for each letter section??
There are many methods to do, the autocorrelation approach is easy and quite effective. You can calcute your signal's autocorre...

nästan 9 år ago | 0

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Answered
<randum number generation
In r you have the numbers you requested r=zeros(52,1); pointer=0; for k=1:52 r(k)=pointer+(1+round(7*rand)); po...

ungefär 9 år ago | 0

Answered
How to plot a function ?
Some ideas here function y=new(a,b) if(a<0) disp('a must be bigger than zero'); end if(b<0||b>1) disp('a must ...

ungefär 9 år ago | 0

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Answered
How to calculate a max value in a array without the built in functions.
A very easy newbie way to do it using a while loop (better with a for loop as Mischa states) >> Time = [1,6,3,6,8,12,1]; ...

ungefär 9 år ago | 0

Answered
How can I draw a circle in matlab using parametric ecuations or the circle ecuation?
>> t=-pi:0.01:pi; >> y=sin(t); >> x=cos(t); >> plot(x,y)

ungefär 9 år ago | 0

Answered
how to fft of a signal taken from an accelerometer data.
If you can apply xlsread(as I infere from your tags) to put your raw data into a matlab vector all you need can be found in this...

ungefär 9 år ago | 0

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Answered
How to generate a signal with time varying frequency?
This is a simple way to do it f=0:0.1:100; int=cos(2*pi.*f);

ungefär 9 år ago | 0

Answered
How to apply hamming window for a frequency domain signal?
Why can't you apply the Hamming window in the time domain, and then compute the FFT of the resultant signal? On the other ha...

ungefär 9 år ago | 1

Answered
How to solve complex equations in matlab.?
I think he wants to actually solve the equation, so perhaps he is looking for something like this >> syms R; Y=-(1-R)/(1...

ungefär 9 år ago | 0

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Answered
How can I define an array of symbolic functions?
Are you looking for something like this? >> syms t; >> a=zeros(3,1); >> a=sym(a); >> a(1)=t; >> a(2)=t+1; >>...

ungefär 9 år ago | 0

Question

How to calculate autocorrelation matrix eigenvalues without actually creating the matrix
Hi, I am working with a large autocorrelation vector (size 1.023e6 ). It is well known that the autocorrelation matrix can be fo...

ungefär 9 år ago | 1 answer | 1

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