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 = ...

2 Tage vor | 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...

4 Tage vor | 1

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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...

4 Tage vor | 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; ...

4 Tage vor | 0

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

5 Tage vor | 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(...

6 Tage vor | 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...

7 Tage vor | 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...

8 Tage vor | 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: ...

9 Tage vor | 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 ...

9 Tage vor | 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...

9 Tage vor | 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...

9 Tage vor | 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...

9 Tage vor | 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...

11 Tage vor | 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...

11 Tage vor | 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) ....

11 Tage vor | 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...

11 Tage vor | 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...

12 Tage vor | 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...

13 Tage vor | 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...

13 Tage vor | 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...

14 Tage vor | 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...

14 Tage vor | 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...

16 Tage vor | 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...

16 Tage vor | 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...

17 Tage vor | 0

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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 ...

20 Tage vor | 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...

20 Tage vor | 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 ...

21 Tage vor | 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 ...

22 Tage vor | 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. ...

22 Tage vor | 1

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