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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Answered
Finding Slope of a curve at a specific point
Try something like this — x = linspace(1, 10); y = sin(2*pi*x/3) + cos(2*pi*x/9); dydx = gradient(y) ./ gradient(x); xv...

4 hours ago | 0

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Aligning two noisy signals
See if the alignsignals function will do what you want. EDIT — (18 Aug 2022 at 16:04) With the signals now provided, I can...

7 hours ago | 0

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What stands for LTI in mathlab
Linear Time Invariant A linear system with the system parameters not changing over time.

8 hours ago | 0

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Measure time difference peaks and stores it
It would help to have the data. One approach would be to use the islocalmax function two times using the 'FlatSelection','fir...

22 hours ago | 0

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highlighting a section of a plot
The ‘x’ vector needs to have more elements in order to provide the necessary resolution to draw the patch object correctly. T...

23 hours ago | 0

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Define secondary variables based on main variables in fsolve
The ‘NELF’ argument needs to be a vector. Also MATLAB is case-sensitive so I made all the vector references capital ‘X’ since t...

1 day ago | 0

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How to calculate FWHM from gaussian histogram fit?
Thje easiest way is to use histfit and then findpeaks with the name-value pair appropriate arguments — X = [0.6268 0.5372 ...

1 day ago | 0

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Answered
changing frequency of an existing audio
Use the Signal Processing Toolbox resample function — [y,fs] = audioread("Sound.wav"); sound(y,fs); L = size(y,1); t = li...

1 day ago | 0

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First element greater than
Try simething like this — v = randi(9, 1, 20) x = 7 first_x_idx = find(v > x,1,'first') Result = v(first_x_idx) .

1 day ago | 1

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Answered
Plotting multiple curves in same graph
See if the hold function will do what you want.

2 days ago | 0

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T is not defined, dont know how to fix
I only see one call to the ‘lacO’ function and the code calling it runs correctly, after the ‘@’ sign is removed in front of the...

2 days ago | 0

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Retreive standard deviation from noise
If you have some idea of the characteristics of the underlying signal (assuming that there is a signal with white noise added to...

2 days ago | 0

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Calculating roots of an equation in Matlab.
When you delcared ‘a’ as symbolic, you cleared its numeric value. Try this — a = 2 kepa = 3/13 lambda = 9 b = -log(kepa)...

3 days ago | 1

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Number of peaks in the interval
A simpler way (if you have the Signal Processing Toolbox) would be to use the buffer function to segment the vector. Then, simp...

3 days ago | 0

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Answered
Can I parse a text file with dates and data using readmatrix or readtable?
It would help to have the file to experiment with. I would just use readtable with no other name-value pairs, and see the res...

3 days ago | 0

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Answered
Trying to plot an estimate of a surface with plot3
Use the surf or mesh functions to plot a surface matrix. Try this — f = @(x,a) a(1)*x+a(2); x = [0.558755760368664;0.83525...

3 days ago | 1

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Answered
how to insert data into matlab
With R2015a use the xlsread function to import the data. Get all of the outputs in case there is column header information that...

4 days ago | 0

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butterworth filter gain higher than zero
The problem is that the plots provided by either fvtool or freqz do not use the scaling factor (‘glow’ here). Plot them separ...

4 days ago | 0

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Answered
Contour Plot Wrong Colors
I get a slightly different result when I use ‘torquev’ and ‘rpmrangev’ to define the interpolation grids, so that may be the pro...

4 days ago | 0

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the legend is not working properly
My guess is that you have an AMD graphics card, and have not updated the graphics drivers in a while. (This sort of legend prob...

5 days ago | 1

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Answered
How can I limit the load function?
I am not certain what you want, however one option is to Load List of Variables into Structure Array You can then limit the va...

5 days ago | 0

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How to combine a marker to a line and show in legend?
Insteaqd of using separate line and scatter calls, use plot. Specifically, see LineSpec.

5 days ago | 0

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Answered
FFT from .csv voltage and current data file
These are not easy files to work with. That is likely the problem. Try this — C1 = readcell('https://www.mathworks.com/mat...

5 days ago | 0

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Answered
how to import csv file with along with its headers in the matlab?
You don’t say what Release you’re using, however in R2022a the readtable function seems to do exactly what you want — T1 = rea...

6 days ago | 0

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Answered
Fourier series fit to a periodic function with multiple frequencies
Adding a second function will change the baseline, for example — t = linspace(0, 10, 1000); s = sum((1./[1;3;5]).*sin([1;3;5]...

6 days ago | 0

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Get the data points after smoothening the plot
I am not certain what you are asking. Try this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_f...

6 days ago | 0

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Answered
fft function error while extracting EEG signals in EDF file
According to the edfread documentation, the ‘data’ are the first output, not the second. The assignments should probably be: ...

6 days ago | 1

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How to determine an y value at a specific x value?
Since ‘sm1’ is a function of ‘W1’ this is not as straightforward as it might at first appear. v1=0.034; %viskozite yağ için...

6 days ago | 1

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Answered
Plot is not lined up with the X axis
I am not certain what the problem is. Using plot with only one argument plots the argument with respect to the indices of the a...

6 days ago | 0

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Answered
using GA including a hybrid function option
In the optimoptions call, the 'HybridFcn' name-value pair must have a function handle to they hybrid function as its value. I...

6 days ago | 0

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