# Carlos

### Universidad Politécnica de Valencia

Active since 2012

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Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

mer än 4 år ago

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

ungefär 10 år ago | 0

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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...

ungefär 10 år ago | 0

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

ungefär 10 år ago | 1

| accepted

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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...

ungefär 10 år 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...

ungefär 10 år ago | 0

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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...

ungefär 10 år ago | 0

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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 ...

ungefär 10 år ago | 1

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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') ...

ungefär 10 år ago | 0

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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 ...

ungefär 10 år ago | 0

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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 ...

ungefär 10 år ago | 0

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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

ungefär 10 år ago | 1

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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...

ungefär 10 år 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...

ungefär 10 år ago | 0

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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...

ungefär 10 år ago | 0

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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...

ungefär 10 år ago | 0

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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...

ungefär 10 år ago | 0

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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...

ungefär 10 år ago | 0

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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. ...

ungefär 10 år ago | 0

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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...

ungefär 10 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...

ungefär 10 år ago | 0

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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 ...

ungefär 10 år ago

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 10 år ago | 0

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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 10 år 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 ...

mer än 10 år ago

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]; ...

mer än 10 år ago | 0

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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)

mer än 10 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...

mer än 10 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);

mer än 10 år ago | 0

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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...

mer än 10 år ago | 1