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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 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

Answered
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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Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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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Answered
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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Answered
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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Answered
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

Answered
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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Answered
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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Answered
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

Answered
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

Answered
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

Answered
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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Answered
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

Answered
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

Answered
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

Answered
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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Answered
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

Answered
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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Answered
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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Answered
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

Answered
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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Answered
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

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