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How do ı calculate the harmonics by inspecting the signal in matlab?
dt = t(2) - t(1); Fs = 1/dt; pwelch(gf,[],[],[],Fs);

11年以上前 | 0

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How to apply time reversal convolution?
Yn = conv(Hn,Xn);

11年以上前 | 0

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Reflecting impulse response with respect to y-axis
n = -3:0; h = fliplr(Hn); stem(n,h);

11年以上前 | 0

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How do I plot this to display a spectrum?
x = wavenumber; y = transpose(squeeze(ref_raw)); plot(x,y);

11年以上前 | 0

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Help for AND circuit
Please type xInitial = 0; at the MATLAB command prompt, and then try running the model. That should eliminate the er...

11年以上前 | 0

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FFT is off by 0.4 dB; How can I account for this in my code?
* <http://www.mathworks.com/help/signal/ref/periodogram.html periodogram> * <http://www.mathworks.com/help/signal/ref/pwelch....

11年以上前 | 0

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How can I graph an equation with 'changing constant' values?
Equation = @(x,y) Constant + 10 + 90*(x>=3) + 900*(x>=6) + 5.*x + 5.*y;

11年以上前 | 0

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Help with Vectors and For Loops and determining whether it's negative or positive?
doc for doc numel doc size docsearch('"logical indexing"') doc false doc true docsearch('"preallocating ar...

11年以上前 | 0

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Why does FFT subtract PI/2 phase shift for sine wave
Think of it this way. Cosine is the real-part of the complex exponential, whereas sine is the real-part of the complex exponent...

11年以上前 | 2

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FFT function in matlab
Neither. It is a straight implementation of the definition of the DFT. Depending on how you choose to scale the result, you ca...

11年以上前 | 0

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Is there a way to display(or know), whether the signal flowing through a line in a simulink model is complex or real ?
* <http://www.mathworks.com/help/simulink/ug/working-with-data-types.html#f14-90571 Display Port Data Types> * <http://www.math...

11年以上前 | 1

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generating a half wave sinusoid using Simulink
Try feeding the output of the *Sine Wave* block to the input of a *<http://www.mathworks.com/help/simulink/slref/saturation.html...

11年以上前 | 0

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Creating a matrix of sinusoids with frequency increasing over columns and time increasing over rows
Fs = 48000; dt = 1/Fs; t = (0:dt:0.25-dt)'; Fc = 60*(1:2:15); y = sin(2*pi*t*Fc);

11年以上前 | 1

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What are new things in error-control coding functions in R2014a? I am using R2011b now.
Please review the <http://www.mathworks.com/help/comm/release-notes.html Release Notes> for the Communications System Toolbox

11年以上前 | 0

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Creating a simple plot
Use |.*| instead of |*| here: y = x.*exp(-x.^2); Also, you will want higher resolution: x = -3:0.01:3;

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define frequency of signal from fft output
Please try: Fs = 1000; dt = 1/Fs; N = 12000; t = dt*(0:N-1)'; x = sin(100*pi*t) + 2*cos(200*pi*t); X =...

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define frequency of signal from fft output
dF = Fs/N; f = dF*(0:N-1)';

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Why do many MATLAB examples model stock price returns instead of absolute changes?
Suppose you own a portfolio containing two stocks, with a total value of $5,000 each. Suppose further that the price of one sto...

11年以上前 | 0

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Hi! can you guide me to plot power spectra of ASK signal?
Here's a start: Tb = 1; % seconds per bit R = 1/Tb; % bits per second M = 100; % bi...

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How can i implement fft on sine wave then plot it ?
doc sin doc cos doc fft doc fftshift doc abs doc plot doc stem

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Using iirnotch for more than one frequency?
Fs = 960; Fc = [ 120 240 ]; Wc = Fc/(Fs/2); BW = Wc/35; mycomb = zeros(2,6); [b,a] = iirnotch(Wc(1),BW(1)...

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i want to know frequency from amplitude of an EEG
doc pwelch doc spectrogram

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Comb filter to remove noise?
|<http://www.mathworks.com/help/dsp/ref/iirnotch.html iirnotch>|

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1D Fourier Transform for square pulse
doc zeros doc ones doc fft doc imag doc real doc plot

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A script that writes all even numbers from 1 to 100
In addition to doc for doc while please try doc linspace and doc colon

11年以上前 | 1

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MATLAB HELP to write a function.
Here's a start: x = pi/4; ideal = cos(x); approx = 1; k = 0; while ( abs(approx - ideal) > ... ) ...

11年以上前 | 1

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How to change scatter plot fonts
set(h1,'marker','*'); set(h2,'marker','+');

11年以上前 | 2

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Combining 2 signals into 1
Please try: plot(n,xn,n,ns); For more info: >> doc plot

11年以上前 | 0

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Strings ASCII and character mapping Questions
doc char doc uint8

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Fourier transform with both time vector and data vector
doc pwelch

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