nirwana

Last seen: Today | Active since 2023

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help me to do nonlinear fitting use lsqcurvefit
please help me, I am begginer in matlab and thsi is my first time doing nonlinear fitting, I have problem to fit data with the m...

18 days ago | 1 answer | 0

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why envelope by hilbert increasing in tail of signal?
I have decay sinusiodal signal that I want to fit in, I use hilbert % Extract the ACF data % Calculate the starting and ending...

21 days ago | 1 answer | 0

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Question

fittting data using nonlinear optimization fminsearch
I have data as below that i want to fit to nonlinear equation. in theory it says that this data can be fit by taking square enve...

25 days ago | 2 answers | 0

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answers

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The extrinsic function 'perms' is not available for standalone code generation.
I am trying generate mex file using matlab coder, where in my function i use function perms, but I get this problem The extrins...

6 months ago | 2 answers | 0

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answers

Question

Unexpected matlab operator when using Matlab Coder
I use Matlab Coder to generate mex file, but in the middle of process I got error message "Unexpected MATLAB operator" that is i...

6 months ago | 1 answer | 0

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Question

failed to generate MEX function, generation of trial code failed
I am trying convert my matlab code in order to speed up thye computational time. let me describe my function is, first I read a...

6 months ago | 1 answer | 0

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save tic toc in duration style
Hi all, I would like to save my computational time using tic toc but in format duration (i am trying to use duration but I don't...

7 months ago | 2 answers | 0

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answers

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result spectrogram from lowpass filter still pass frequency above the treshold
I am trying use lowpass filter to my time series data and then i perform spectrogram to check wheater the signal still containin...

7 months ago | 1 answer | 0

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combine spectrogram result in one figure
I have 20 min signal and would like to combine its sepectogram become one spectrogram consecutively. my idea is put index of eac...

7 months ago | 1 answer | 0

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make figure spectrogram as length as signal above it
I would like to put spectogram result below the signal figure. I use specgram (in second row) and spectogram result in last row,...

7 months ago | 0 answers | 0

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plotting data to get mahalanobis and eucledian distance
I get example from book to calculate mahalanobis and eucledian distance as shown below, but the book doesn't provide ilustration...

1 year ago | 1 answer | 0

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quadratic curvature doesn't went smoothly
Anyone can help me? I am trying to fit my data with first and second order polynomial, but the result of quadratic curvature do...

1 year ago | 1 answer | 0

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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...

1 year ago | 1 answer | 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...

1 year ago | 1 answer | 0

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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),...

1 year ago | 1 answer | 0

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Question

sign in option in matlab does not work, i can not install adds on
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...

1 year ago | 1 answer | 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...

1 year ago | 1 answer | 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...

1 year ago | 1 answer | 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...

1 year ago | 0 answers | 0

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answers

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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...

1 year ago | 2 answers | 0

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answers

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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...

1 year ago | 1 answer | 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...

1 year ago | 1 answer | 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 ...

1 year ago | 2 answers | 0

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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...

1 year ago | 1 answer | 0

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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. ...

1 year ago | 1 answer | 0

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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]...

1 year ago | 1 answer | 0

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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...

2 years ago | 1 answer | 0

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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...

2 years ago | 1 answer | 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...

2 years ago | 3 answers | 0

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answers

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...

2 years ago | 1 answer | 0

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answer

nirwana

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