Star Strider

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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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[ideas wanted]: How to find "peaks" of sloping signal?
The online ability to run scripts seems to be broken. I used MATLAB Online to devise this — % LD = load('data.mat') file = ...

14 hours 前 | 1

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Computing error and plotting its graph
The reason the code fails is that: abs(x1-xx) is a (1 x 51) vector (because ‘x1’ is also a (1 x 51) vector), and it’s not pos...

2 days 前 | 0

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Calculating the aortic flow downstream valve using Womersley and 3-element Windkessel model calculations from my FSI results - Why unusual sine waves at the end of flow curve?
I’m not familiar with your abbreviations. FSI = ? STJ = ? Beyond that, your code runs without error. Please explain what...

2 days 前 | 0

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generate white noise signal with certain bandwidth?
The filtered signal iis no longer a white-noise signal, although the original signal is. Try this — Fs = 1000; ...

3 days 前 | 0

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Powerline interference in ECG
Try this — Fs = 256; % Signal Sampling Frequency Fn = Fs/2; ...

4 days 前 | 0

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How can I solve this confidence level error?
You are plotting it incorrectly. Use this: loglog(f_pressure, Pxxc_pressure, 'r', 'LineWidth', 1.5); instead of: loglog(...

4 days 前 | 0

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Detecting storms from wave height data
I am not certain what you want. Try this — load ('H.mat'); %3 hour data whos('-file','H.mat') threshold=1 % t = linspace...

6 days 前 | 0

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Płot sample of signal
The number of samples you need to plot is equal to the sampling frequeency multiplied by the number of seconds. Fs = 1000; t...

6 days 前 | 0

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How to solve this equations using matlab code,I use solve but I have obtained a wrong and strange solution, and I don't know why.
It would help to have your code. See if using the vpa function will produce a moree understandable reesult, specifically: ...

7 days 前 | 0

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Process Reaction Curve: Ziegler-Nichols rules
I’m not certain that I understand what you’re asking. See if the System Identification Toolbox procest function will do what ...

7 days 前 | 0

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Would you please help me to install and use FFmpeg?
Use your favourite search engine and the search string: ffmpeg windows I found several sites that apparently show how to do tha...

7 days 前 | 1

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Set decimal place for uitable
It may be necessary to create a string variablee or character array to get what you want, because MATLAB will use full precision...

7 days 前 | 0

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Reading data in MATLAB
Try this — % T = readtable('data_Labor1_CH1_AnAusSpannung.txt','VariableNamingRule','preserve') T = readtable('data_Labor1_CH...

8 days 前 | 0

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Can someone help to teach how i want to upload this file into matlab and try preprocessing ?
See the documentation section on Import or Export a Sequence of Files. More specifically, I would do something like this: f...

9 days 前 | 0

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Filtering nose and removing spikes at local areas
The findpeaks function may be an option, however it defines a peak as having a lower values on each side of it, so it will not p...

10 days 前 | 0

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Can't access data using " .DateTime " string
Perhaps this — imshow(imread('peppers.png')) metadata = imfinfo('peppers.png') DateTime = datetime(metadata.FileModDate) ....

10 days 前 | 0

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Format scientific decimal place bar plot
I wrote some utility functions for just this purpose for my own use a few years ago. Try this — load('data_c.mat'); x = un...

10 days 前 | 0

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Trying to Filer Baseline Signal Noise - Getting Additional Peaks at High Frequencies
The problem may be your filter design. If you have R2018a or later and the Signal Processing Toolbox, use the highpass functi...

10 days 前 | 0

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Constructing a string with several index requirements
I’m not certain what you need, however this is one option — r2 = [0 30 60 90 120 150 180 210]; command=['S...

11 days 前 | 0

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Scatter Plot following a colormap regulation
The DisplayName name-value pair will use that information for the legend entry for each plotted pont. If you want the station n...

11 days 前 | 0

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Plot files with legend names indicated from a value from each file
All the files have the same format, so this is straightforward — mats = dir('*.mat'); numprof = numel(mats); couleur = jet...

12 days 前 | 0

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Integration symbiolic form in matlab gives error
If you have R2012a or later, use the integral2 function instead — Part_1=@(r,theta) 1+(2.*(1+r.*cos(theta))).^2; W_i=@(r,thet...

13 days 前 | 0

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Assistance Needed with FIR Comb Peak and Notch Filter Design in MATLAB
The peak filter was a bit challenging, however I got it to work reasonably well. The comb filter may not exactly meet your de...

14 days 前 | 1

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curve fitting using lsqcurvefit on kinetic data for parameter estimation
The model itself is a bit misleading. A better option might be: That produces an equivalent fit with paramete...

15 days 前 | 0

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Detect main part of a signal
I usually use the envelope function, usually using the 'peak' option, and then test for the first instance of those (ususlly the...

15 days 前 | 0

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已回答
FFT result dependent on number of interpolation points
The interpft function is intended to interpolate the Fourier transform, and it does a reasonably good approximation. I checked ...

19 days 前 | 0

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Convert string into datetime
It would help to have the file. Try this — Date_Time_rural = ["2023-10-31 00:00:00"; "2023-11-01 00:00:00"; "2023-11-02 00...

19 days 前 | 0

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Fourier Series Representation of Periodic Functions
I would write the piecewise call differently — syms t omega a_k = piecewise(0 <= t < 0.4, 1, 0.4 <= t < 0.5, -1) figure ...

20 days 前 | 0

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I am taking two excel files with similar x value data and want to plot the y values of one of the plots with different colors based on if the second file reads 0 or 1.
This is something of a challenge. In order to be able to use both records, it is necessary to intterpolatee the shorter record ...

20 days 前 | 0

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Why does the phase response get cutoff beyond a frequency?
The most likely reason is that the filter numerator coefficients are close to the limit of floating-point approximation error. ...

21 days 前 | 1

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