# Star Strider

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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**Content Feed**

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...

17 hours ago | 0

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...

17 hours ago | 0

Plot Day of Year with Time

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

18 hours ago | 0

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

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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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

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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Unrecognized function or variable 'wgs2utm'

Search the File Exchange for wgs2utm.

3 days ago | 0

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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

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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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

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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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

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

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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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

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

Index in position 2 exceeds array bounds. Index must not exceed 2?

See my Comment to your earlier Question.

6 days ago | 0

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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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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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

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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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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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

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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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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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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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

Plot timeseries for mean monthly temperature

Create a timetable of your data and then use the retime function.

9 days ago | 0

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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