Star Strider

Last seen: Today | Actif depuis 2012

Hic sunt dracones! PROFESSIONAL: Physician (M.D.): Diplomate of the American Board of Internal Medicine; M.Sc. Biomedical Engineering: Instrumentation, Signal Processing, Control, System Identification, Parameter Estimation NON-PROFESSIONAL: Amateur Extra Class Amateur Radio Operator; Private Pilot, Airplane Single Engine Land, Instrument Rating Airplane; Gamer NOTE: I do not respond to emails or personal messages, unless they are about my File Exchange contributions. Time Zone: UTC-7 (Standard); UTC-6 (Daylight Savings/Summer)

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I have a line of experimental data and need to plot confidence interval
I recognise my code (although it’s likely fairly old). This calculates the plots the confidence intervals for a matrix of exp...

environ 2 heures il y a | 0

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Matlab mixed IIR Filter
The ‘x3’ signal may do what you want — fs=100; % sampling frequency f1=1; f2=30; % frequency of the ...

environ 2 heures il y a | 0

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display multiple 3D figures with plot3
Save each loaded file to a cell array instead. Try something like this — a = randi(9, 10, 3); writematrix(a,'Test1.txt'); ...

environ 3 heures il y a | 0

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Build a State Space model from identified Modal Parameters
That may be possible using the Signal Processing Toolbox invfreqz and tf2ss functions. I put the idfrd and ssest calls at the e...

environ 22 heures il y a | 0

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how to find the noise frequency in ECG signal?
If you are allowed to use findpeaks, this is straightforward — % clear load(websave('coursework2ECG2022','https://www.mathwor...

1 jour il y a | 0

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How to access data of an iddata object in a cell array?
The iddata object is a structure, so in this instance, use cell array indexing and structure referencing to get its contents — ...

1 jour il y a | 0

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How can I find the order of normalized Chebyshev Type I high-pass filter ?
I use the cheb1ord function for such problems. There are equivalent functions for other filter designs. It was introduced be...

2 jours il y a | 0

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Create a Notch filter with low and high pass filters
Use the bandstop function, specifying 'ImpulseResponse','iir' for best results.

2 jours il y a | 1

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vpasolve gives me only 1 x-value of intersection
An analytic approach is an option, however it will be necessary first to estimate the approximate zero-crossings in any event. ...

2 jours il y a | 2

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How to parameterize function.
Try something like this — syms t x y z P{1} = x^2 +2*y +3*z; P{2} = x*y -2*z^2; P = subs(P,{x,y,z},{t,t,t}) See the docu...

3 jours il y a | 1

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How to match cell arrays according to their sample ID?
Try something like this — %% Create sample data A= {'Sample ID', 'Value'; 1, 1050; 2,1133; 3,1001; 4,1200}; B= {'Sample ID',...

3 jours il y a | 1

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Resampling matrices in a loop using interp2
I am not certain what hte problem is, since the error messagd is not part of the provided information. I suspect the problem ...

3 jours il y a | 0

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overwrite figure(2) on figure(1)
I am not certain what you are asking. Consider using the hold function to plot two figures on the same axes — syms x f = si...

4 jours il y a | 1

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Plot graph using dots and colormap to show the frequency
It is ceretainly possible to scale any of the axes logarithmically, providing that none of the plotted values or axes values are...

4 jours il y a | 0

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retime Linear or next
Try something like this — Time = datetime('now')+hours(0:2).'; Temperature = 10*randn(size(Time)); T2 = table(Time,Temperatu...

4 jours il y a | 0

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I have a raw eeg data and i want to plot the alpha wave(8-12Hz) of this data in the same window . How can i do? please help me
Design a bandpass filter (using bandpass or other appropriate function), filter the signal, and plot it — Fs = 1000; L = 1E+...

4 jours il y a | 1

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Why do I get "Array indices must be positive integers or logical values" error when using "angle" function?
You have a variable named ‘angle’ somewhere in your workspace. If you run: which angle -all the results should be similar to...

4 jours il y a | 0

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Finding similar elements in a single matrix
One approach using accumarray — x = [2 0 0 3 3 0 4 4 0 5 5 5 6 6 6]; [Aunique,~,idx] = unique(x(:))...

5 jours il y a | 0

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How to Stop FOR loop when "answer" is reached, and display answer?
See the documentation on the break function.

5 jours il y a | 0

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Excel column informtion input
I would use readtable to read the file, then addvars to add one or more variables in the desired position, then writetable to wr...

5 jours il y a | 0

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Genetic Algorithm not returning best found solution
I do not entirely understand what your ‘obj_fun’ fitness function optimises, however expecting ga to optimise 37 parameters in 2...

5 jours il y a | 0

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how to read .txt file having the following format.
Use the readcell function — C1 = readcell('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1214888/example.txt'...

5 jours il y a | 0

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how to save anovan figure as a .fig?
It is likely not possible to save the image, however anovan creates a table with the same information if you request it, and it ...

5 jours il y a | 0

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how to plot 3D figure like this?
Try something like this — Fs = 250; L = 100; f = 1.26; t = linspace(0, L-1, L)/Fs; s = sin([0 (1:2:20)].'*2*pi*t*f)./[1 (1...

6 jours il y a | 0

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Representing samples on analog signal according to the sample period (MATLAB)
The easiest way to create the time vector is: t = linspace(0, L-1, L)/Fe; Example — LD = load('handel.mat'); y = LD.y; F...

6 jours il y a | 0

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Plot Day of Year with Time
Try something like this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1213723/Data_2.csv') ...

6 jours il y a | 0

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defining state matrix as anonymous function
Referring to your other post: ode45 is running an infinite loop (it isn’t actually, since switching from ode45 to ode15s solves ...

7 jours il y a | 0

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How to make a line of fixed length?
It is relatively straightforward to write an anonymous function for this — createLine = @(startpt, slope, len) [startpt(1) sta...

7 jours il y a | 0

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How to find and fit the objective function for a damped oscillation?
Using fminsearch — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1211598/F300.xlsx') x = T1....

7 jours il y a | 1

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Getting "Arrays have incompatible sizes for this operation." on this exercise
The ‘z’ assignment fails because the arrays used to calculate it are empty, likely because the first 50 elements of ‘n’ are less...

8 jours il y a | 0

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