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Star Strider


Last seen: Today
16,077 total contributions 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.

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Answered
Unable To Find Explicit Solution [Empty Syms]
There is no function called ‘T’ so ‘T(0)’ is not defined. Try this instead — syms I(t) Mu To t %Used to decalre variables a...

2 hours ago | 0

Answered
Merging overlapping circles and remove the union part
One approach — t = linspace(0,2*pi,500); % Allow Adequate Resolution For Best Re...

21 hours ago | 1

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Answered
Creating for loop for a piecewise function
One problem is that MATLAB subscripts are integers greater than 0, so setting ‘V’ to 0 and using it as a subscript will fail. ...

1 day ago | 0

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Answered
"Array indices must be positive integers or logical values" for i=2 in loop
The error that throws when I run it in the online Run feature has to do with: Fxy2II=@(xxII,yyII,ffiII) 1/E*I*(-3*p*a-p(xxII-a...

1 day ago | 2

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Answered
FiltFilt function giving NaN values
The signal itself (as well as the value of ‘srate’) may be important here. (The factor of 2 is not necessary.) I have no ide...

2 days ago | 1

Answered
error using fzero in line 6
Try something like this — hw7 % Call Function function hw7 fun = @(e) hw7f...

2 days ago | 0

Answered
Ho do I use symbolic expressions to define a new function?
See if this slight revision of the posted code does what you want: f = @(t) cos(t); % L = integral_a^b(sqrt(1+f'(t)^2)dt df ...

2 days ago | 0

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Answered
Find min and max values in a constant interval.
The findpeaks function works, however it needs help to detect correctly the maxima and minima. Try this — opts = detectImpo...

2 days ago | 0

Answered
Multiple plots in a single graph
It is necessary to create them in a loop, storing them in a cell array. After that, a single call to the functions works — m ...

2 days ago | 0

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Answered
Hi , can someone help me in printing the following expressions using matlab.
See: The Not So Short Introduction to LaTeX2e for reference. .

3 days ago | 0

Answered
Initial conditions problem ODE15S
I will copy and run that (again) if necessary. In the interim, see if actually calling the plot function works — figure pl...

3 days ago | 0

Answered
I need to convert comma ',' to dot '.'
One option in detectImportOptions (introduced in R2016b and updated in later releases) in Parameters for Text Files Only allows ...

3 days ago | 0

Answered
Date stamp on plot
The only way I can devise to delete the date is to create new y-tick labels and use them instead — F = openfig('untitled.fig')...

3 days ago | 0

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Answered
Using trapz just for positive areas
I would just use interp1 to interpolate the data, then use trapz to integrate it. The resolution of ‘xi’ determines the precisi...

4 days ago | 1

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Answered
How do I edit this bar graph? Y-axis thickness and ticks
See if the YAxisLocation and other Axis Properties and Numeric Ruler properties will do what you want.

4 days ago | 0

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Answered
Plotting an amplitude spectrum of a .txt file
Try this — D1 = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/647750/spec.txt'); signal = D1; L...

4 days ago | 1

| accepted

Answered
Draw arc with specified angle difference
Try this — LD = load('Data.mat'); Data1 = LD.Data1; A1 = Data1(:,1); R1 = Data1(:,2); D1 = Data1(:,3); Data2 = LD.Data2...

4 days ago | 0

Answered
Plotting sine wave for voltage with variation of frequency
I am not certain what the desired result is. If the frequencies and amplitudes are fixed with respect to time, try this — t...

4 days ago | 0

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Answered
3D matrix surface plot animation
Try this — M = rand(10,10,5); % Create Test Matrix figure for k = 1:size(M,3) surf(M(:,:...

4 days ago | 0

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Answered
How to stack histograms
See my Comment replying to your Comment.

5 days ago | 0

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Answered
Trimming data with for loop
I am not certain what you want to do. Try this — acq2.data = randi([0 5], 10, 5) % Create Matrix i...

5 days ago | 0

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Answered
How do i insert seconds in a timeseries data when the frequency of the data is inconsistent?
Try this — Input_data = ['9/5/2021 11:30:00' '9/5/2021 11:30:00' '9/5/2021 11:30:00' ...

5 days ago | 0

Answered
4 unknown 4 equetions
syms a b c d eq1=a+b+c+d==-9.3; eq2=(b*a+2)+(2+d*c)+(c+d)*(b+a)==+7; eq3=(b+a)+(d+c)*(b*a+2)+(a+b)*(2+d*c)+(c+d)==-4.507;...

5 days ago | 0

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Answered
Mann-Kendall test
See if the File Exchange contributions Mann-Kendall Test or Cumulative Mann-Kendall trend test will do what you want.

5 days ago | 0

Answered
How do I plot points on a contour?
I am not certain what result you want. I plotted it with scatter3, however if the intent os to have lines connecting the poin...

6 days ago | 0

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Answered
Filter function in MATLAB
The instability is generally not a problem with second-order-section realisation of IIR filters. The filtfilt function can oc...

6 days ago | 0

Answered
frequently used function for table variable
I am not certain what ‘T’ looks like. Something like this would work — T = table(randi([-40 40],5,1),'VariableNames',{'OldV...

6 days ago | 0

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Answered
How to select a specific column in matrices?
Concatenate them, then select the second column of the concatenated matrix — A = randi(9,4) B = randi(9,4) C = randi(9,4) D...

6 days ago | 1

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Answered
how to edit the axes tick labels?
Some of that can be done by setting the xlim property, the rest by decreasing the width of the axes ysiung the 'Position' proper...

6 days ago | 1

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Answered
How do I solve two ode (dct/dt and dR/dt) simultaneously with ODE45 and optimize two parameters using global optimization ?
See for one example: Parameter Estimation for a System of Differential Equations and How to properly model a kinetic reaction ...

6 days ago | 0

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