# 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 find Laplace transform of u(-t) in MATLAB?

That is the correct result, since the unit step (heaviside) function is 0 for negative time (time less than 0), so that result i...

2 hours ago | 0

generate average numbers between two numbers inside a vector

One approach — V = [3.4789; 0; 0; 3.3535; 0; 0; 3.2398; 3.2263; 0; 0; 0; 3.0846; 0; 0; 2.9815; 0; 2.9430; 0; 2.9055]; r0 = [2...

5 hours ago | 0

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How to add a legend for multiple figures with horizontal and south location

I am not certain what you want. Try this — % Please how can add one legends for the subplots. I want the legend % location...

6 hours ago | 0

How can I add query points between two adjacent points of sampled data？

T1 = table([1 3 4 6 10].',[1 1.4 1.8 2.2 2.6].', 'VariableNames',{'x','xq'}) N = 6; for k = 1:size(T1,1)-1 v(:,k) = lin...

8 hours ago | 0

How can I add query points between two adjacent points of sampled data and perform interpolation?

Here is one approach — A = linspace(-21.0598, -18.777, 11).'; % Create Data B = linspace(-19.194...

24 hours ago | 0

How to fix the error

The error message is clear. Put the function at the end of the file and the code works — % Set random seed value rng(123)...

1 day ago | 0

Plotting spectrograph from spectrum analyzer data

Yiour data needed a bit of tweaking. Tehe times in the ‘TimeData’ matrix are contiguous, so they can be converted into a vector...

1 day ago | 1

Biphasic Pulse signal with FFT

The problem was that ‘wholeSignal’ had 60 more elements than ‘t’ so I artificially shortened it: wholeSignal = wholeSignal(1:n...

2 days ago | 0

How to count how often a variable returns to zero and then increases from zero

One method to find the first instance of a zero value is to use the strfind function. You can use it again to determine the ind...

3 days ago | 0

How do I compute averages for NOAA SST data?

The easiest way to do this is to use the accumarray function — T1 = readtable('ersst5.nino.mt...-20.ascii.csv', 'VariableNami...

4 days ago | 0

How can i calculate the area under two curves that intersect?

Integrate them using trapz then do what you want with the results (keep them as they are, add them, add their absolute values, ...

4 days ago | 1

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The legend option called interpreter latex does not display the latex symbols correctly

You need to put dollar signs ($) around the string you send to the LaTeX interpreter — plot(1:10,1:10,'DisplayName','$\eta_i$'...

4 days ago | 1

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Transfer function extraction from frequency response

You will need to use the System Identification Toolbox for this. Then: ResponseData = mag.*exp(1j*phase); data = idfrd(Res...

4 days ago | 0

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how to use the hanning window to smooth the photon signal

That appears to be some sort of spectrum. I am not certain what you want to do with it, however windowing it is not likely to p...

5 days ago | 0

how to plot table to line graph with dots ?

There are easier ways to import the table using detectImportOptions, however since it exists as posted, try this — x = str2dou...

5 days ago | 1

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Plotting several plots of respective ranges from an excel file into one single plot

Perhaps this — opts = detectImportOptions('tempDataTrollhFlygpl.xlsx', 'VariableNamingRule','preserve', 'HeaderLines',9); opt...

5 days ago | 1

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scatteredInterpolant using a matrix, F = scatteredInterpolant(x,y,v) form

‘Input data point values have invalid dimension. The data must be specified in column-vector format.’ This holds when you ini...

5 days ago | 0

Find Coefficients of an equation

Using two independent variables is relatively straightforward. You need to concatenate them, then refer to them individually i...

6 days ago | 0

Can someone help me solve this different equation on matlab?

Perhaps this — % 1/r * d/dr(r*dS/dr) + c1 - c2 syms r S(r) c1 c2 S0 DS0 Eqn = 1/r * diff(r*diff(S),r) + c1 - c2 S = dsolv...

6 days ago | 0

How can i 3d plot this table in matlab?

Try this — A1 = readmatrix('cc.csv'); x = A1(1,2:end); y = A1(2:end,1); z = A1(2:end,2:end); figure surf(x,y,z, 'EdgeCo...

6 days ago | 0

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Why can't I run my code? (tfest function)

Run this from a script or your Command Window: which tfest -all It should give you this identical result. If it shows anyt...

6 days ago | 0

To find angular frequency and wave vector for time series data

From what I’ve been able to discover, the ‘minimum vairance method’ is a heirarchical clustering approach. MATLAB has a few way...

7 days ago | 0

Dealing data with text and numerical in .txt file

I am not certain what you intend by ‘visualize’. Perhaps this — T1 = readtable('M I T 2024 02 17.txt', 'Delimiter',{',',':'...

7 days ago | 0

Compare rows from different columns

One approach — A = randi(50,10,2) Col_2_Larger = A(:,2) > A(:,1) ColNr = find(Col_2_Larger); fprintf('Col 2 larger in row...

7 days ago | 0

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How can I ensure that the initial solution (x0) for fsolve does not result in Inf or NaN values?

The approach I use (if possible) is to plot the function first. Most of the time, it is possible to plot it in one or two dimen...

7 days ago | 0

How to plot the error of two numerical methods on the same graph?

I cannot run your code because I do not have arguments for the functions. (I tweaked them to make them a bit more efficient.) ...

8 days ago | 1

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How to add ytick as we want in Matlab?

Perhaps setting the 'YScale' to 'log' will do what you want — mean = [10^-3, 10^-4, 10^-5, 10^-6, 10^-7, 10^-8]; variance =...

8 days ago | 0

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integral with using parameters optimization

I’m running your code offline, and it’s taking forever (278.146278 seconds). What ‘variables’ are you referring to? Are they...

8 days ago | 0

Extracting 2 columns from a excel file and send them to an own matrix file

Perhaps something like this — opts = detectImportOptions('tempDataTrollhFlygpl.xlsx', 'NumHeaderLines', 9, 'VariableNamingRul...

8 days ago | 1

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Rotating text to 90 degrees

I’ve never used PsychToolbox, however that would be relatively straightforward in MATLAB graphics — alphabetT = 'T'; figure...

8 days ago | 0