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Star Strider


Last seen: Today Active since 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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Answered
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...

18 hours ago | 0

Answered
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...

18 hours ago | 0

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

19 hours ago | 0

Answered
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 ...

1 day ago | 0

Answered
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...

2 days ago | 0

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Answered
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....

2 days ago | 0

Answered
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...

3 days ago | 0

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Answered
Unrecognized function or variable 'wgs2utm'
Search the File Exchange for wgs2utm.

3 days ago | 0

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Answered
Can I find likelihood function of an objective function?
If you have the Statistics and Machine Learning Toolbox, see if the mle function (and associated functions) will do what you wan...

3 days ago | 0

Answered
How to make contour plot of two matrices in MATLAB?
‘Data files both are matrices with 1 row and 55 columns, which represent 55 points.’ They are vectors by definition, and it i...

4 days ago | 1

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Answered
Broad confidence bound range when fitting in Matlab
The important thing to note here is that the confidence intervals for ‘n’, ‘L’ and ‘A’ include zero (have opposite signs) and ...

4 days ago | 1

Answered
add transparency to a contourf
You have to use the handle to the contourf plot to set the transparency — [X,Y,Z] = peaks(50); figure contourf(X, Y, Z) ...

4 days ago | 0

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Answered
How to find the frequency of a morse code (sinusoidal signal) mixed with an audio music signal from a .wav file?
Start with the pspectrum function to analyse the signal, using the 'spectrogram' option, or just use fft, although if the Morse ...

4 days ago | 0

Answered
how to make an audio
I would use a Gaussian for the envelope function, similar to: envfcn = @(ct,sf,t) exp(-(t-ct).^2*sf); where ‘t’ is the time v...

5 days ago | 0

Answered
Need to print the output to newline while creating a table
In the loop, subscript the different assignments, for example: Var1(j,:) = type(j); Var2(j,:) = dx(j); and so for the rest. ...

5 days ago | 1

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Answered
Converting Y-axis values to the base of 10
This can be done easily using ytickformat (introduced in R2016b) — x = linspace(0, 2.5); y = 6*exp(-1.5*x) - 6; figure pl...

5 days ago | 0

Answered
How to get contour plot of multiple Datas in the same plot?
I did something like this recently in Contourf plot of magnitude of transferfunction along trajectory. See if you can adapt tha...

5 days ago | 0

Answered
Index in position 2 exceeds array bounds. Index must not exceed 2?
See my Comment to your earlier Question.

6 days ago | 0

Answered
Unrecognized function or variable 'lof'.
The lof function was introduced in R2022b. You will need to upgrade to the latest release to use it. (The onine documentatio...

6 days ago | 0

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Answered
Converting Date Format to serial date
I’m not certain what the decimals are, however they appear to be sequential so they may be fractions of a year. Unfortunately...

6 days ago | 1

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Answered
why my script doesnt run ?
Use fplot not plot here — syms s t ; %Space of Time % % t = 0:10:15000; % Commented-Out %Kelvie...

6 days ago | 0

Answered
How do i reset a fileID value?
Using: fclose('all') should close all of them. You can then start with fid = 3. Also, I lost count of the number of '%...

7 days ago | 0

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Answered
Read a file (other than .txt) as table in Matlab
This reads the file to a table, then eidts it to create a datetime array froim the first four columns, and replaces them with it...

7 days ago | 0

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Answered
ode45 is running an infinite loop
The system is ‘stiff’ bercause of the large differences in the parameter values. Use ode15s to get results — tspan = [0, 10...

8 days ago | 0

Answered
I need to group certain hours of a day into day and night categories from my xlsx file in the format "yyyy-MM-dd'T'HH:mm:ss."
The isbetween functin is the correct approach here, although if you have one set of 12-hour segments and you want to go over sev...

8 days ago | 0

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Answered
How to use FFT on my acceleration data in Matlab?
Try something like this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1203773/example.xlsx'...

9 days ago | 0

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Answered
polar plot in matlab from data and graphs in excel
I prefer readtable because it also imports the variable names. To do the plot, use the polarplot function. For more inform...

9 days ago | 0

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Answered
How to create a dynamic function handle?
I have no idea what you are asking. It is straightforward to create a function handle that accepts various function arguments...

9 days ago | 0

Answered
Plot timeseries for mean monthly temperature
Create a timetable of your data and then use the retime function.

9 days ago | 0

Answered
Why is it that if I try to fill a strange polygon it comes out of the edges?
Using polyshape is one option, and likely the only approach that would work here — x0 = [45;45;50;50;50;50;50;55;55;55;55;55;5...

9 days ago | 0

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