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# Carlos

86 total contributions since 2012

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Calculating frequency of a sine wave with varying frequency

environ 5 ans ago | 0

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...

environ 5 ans ago | 0

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

environ 5 ans ago | 1

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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...

environ 5 ans ago | 1

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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...

environ 5 ans ago | 0

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...

environ 5 ans ago | 0

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 ...

environ 5 ans ago | 1

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') ...

environ 5 ans ago | 0

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 ...

environ 5 ans ago | 0

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 ...

environ 5 ans ago | 0

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

environ 5 ans ago | 1

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...

environ 5 ans ago | 0

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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...

environ 5 ans ago | 0

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...

environ 5 ans ago | 0

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...

environ 5 ans ago | 0

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...

environ 5 ans ago | 0

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...

environ 5 ans ago | 0

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. ...

environ 5 ans ago | 0

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...

environ 5 ans ago | 0

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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...

environ 5 ans ago | 0

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Solved

Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

plus de 5 ans ago

<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...

plus de 5 ans ago | 0

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 ...

plus de 5 ans ago | 0

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Solved

Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

plus de 5 ans ago

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]; ...

plus de 5 ans ago | 0

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)

plus de 5 ans ago | 0

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...

plus de 5 ans ago | 0

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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);

plus de 5 ans ago | 0

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...

plus de 5 ans ago | 1