Community Profile # nirwana

Last seen: Today Actif depuis 2023

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Question

why FFT result and IFFT result has diffrent in very small value? how to avoid this to increase precission?
I read from the book that IFFT from FFT result as ifft(ftt(signal)) wil give us the original signal. I try to substract both of...

14 jours il y a | 1 réponse | 0

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Question

help me with for loop
I know this is very basic question, but i still has difficulty to answer it i try to add some fourier series to prove gibbs eff...

14 jours il y a | 1 réponse | 0

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Question

error plotting, but succed when plotting order is change
I am tring to plot instantaneous freq using code below, subplot(311),instfreq(signal,srate,'Method','hilbert'); subplot(312),...

23 jours il y a | 1 réponse | 0

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I install matlab in fedora using student lisence from uni, but the sign in bar in the left side still no showing my ID. Also i...

environ un mois il y a | 1 réponse | 0

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Question

Help IFFT can not restore to original signal after filtering
I tried to compare original signal and signal after high pass filter using ifft. but the result seems odd to me. Can anyone expl...

environ un mois il y a | 1 réponse | 0

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Question

Why damping amplitude the amplitude shifting position of y azis
I damped the amplitude signal using by multiplied the freq with 0.5 after fft result, and returning the signal to time domain us...

environ un mois il y a | 1 réponse | 0

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Question

Meaning of manual hilbert transform
I am in early stage of learning hibert transform, and i sumarize the step of computing Hilbert is (CMIIW) : computing FFT of si...

environ un mois il y a | 1 réponse | 0

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Question

Why result of conv and point wise multiplication has different result?
I am comparing conf function and sum over point wise multiplication of two signal and then plot it. I end up with figure that ha...

environ un mois il y a | 2 réponses | 0

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Question

wny fft does't work with different signal?
I am using fft to extract freq content in my two type of time series. First, time series (file sig_fft.txt) look good and showin...

environ un mois il y a | 1 réponse | 0

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Question

How to put legend in subplot automaticaly using for end?
Can anyone help me how to put legend in left and right figure as shown below? Since this figure generate by looping (for-end), I...

environ un mois il y a | 1 réponse | 0

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Question

express ODE without set a m file function
Can someone explain this to me? actually this is part od example in the numerical book I found example in numerical book about ...

4 mois il y a | 2 réponses | 0

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Question

plot line with function but doesn't appear like i want
I have a figure below and i want to reproduce it using matlab figure . The diagonal line come from equation x/(sqrt(x^2+a^2...

5 mois il y a | 1 réponse | 0

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Question

set first derivative equal to zero with some constant
I have equation from derive from snellius law and i'd like to set its derivative equal to zero since fermat principle said so. ...

5 mois il y a | 1 réponse | 0

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Question

How to save result after run function for different input in matlab
I use a function with different input, but the input has no temp=[26.67 93.33 148.89 315.56]; visc=[1.35 0.085 0.012 0.00075]...

6 mois il y a | 1 réponse | 0

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Question

save animation into gif
hi...i wrote my function and making it as walking sine, and i'd like to save it as a gif. can anyone help me? close all t = l...

6 mois il y a | 1 réponse | 0

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Question

animated sine wave continously
Hi alll, i'd like to make sine wave with three variation and walk continously, but i end up make it uncontinously, here the scr...

6 mois il y a | 1 réponse | 0

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Question

Plot complex signal with imaginary and complex
Hi....i would like to plot imaginary and real number of my signal. The expected output as shown below, but i don'e know which pl...

6 mois il y a | 3 réponses | 0

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Question

How to plot convolution between signal and Hilbert tranform operator
Hi... I ask to reproduce the complex signal as a result from convolution between cosine wave and hilbert transform operator as a...

6 mois il y a | 1 réponse | 0

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Question

connecting sinus function with circle through animation
Hi...I am trying to make animation that shows sinus function is a circle as ilustrate in the fig. First my problem is how to rot...

6 mois il y a | 1 réponse | 0

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Question

can we make 3D mash plot from eq y(x)
I have equation ball trajectory y=(tand(theta)*x-(g/(2*v0^2*cosd(theta)^2)*x.^2)+y0 i wonder how to make mesh plot when i have...

7 mois il y a | 2 réponses | 0

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Question

make function to plot countour and 3D
Hi, I want to make automatic function to plot 3D mesh and contour to given any function, but it turn doesn't work, can you help ...

7 mois il y a | 1 réponse | 0

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Question

Error msg in fminbnd
Hi all I an trying to find minimum value of function using fminbnd sing this script x=linspace (0,6); y=6*cos(x)+1.5*sin(x); ...

7 mois il y a | 1 réponse | 0

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