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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.

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Answered
How to plot specific range of values in a plot?
Perhaps: plot(X([2:5 7:end]),Y([2:5 7:end]),'ko') Create vectors with specific values by enclosing them in square brackets []...

11 hours ago | 0

Answered
Please assist! Z1= exact solution; Z2= approximate solution. Now i want to plot a 2D graph of the exact and approximate solution in ONE graph to campare the results
Try this: alpha=1; t=0.004; [x,t] = meshgrid(-4:.1:4, 0.1:.2:0.4); exact=(sech(x/4-t/4)).^2; f0=(sech(x/4)).^2; f1=(s...

11 hours ago | 0

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Answered
Ode 45 / Ode xx: Solve time depending system of equations (2nd order)
The clear and clc calls are not necessary, global variables are never advisable, and the syms call is also not necessary. Creat...

13 hours ago | 0

Answered
Reorganization of experimental data
The data file you attached does not appear to bear a strong resemblance to the data file you quoted. I chose to use textscan ...

1 day ago | 0

Answered
Finding the intersection points between two curves
Several options — h=20; K=13.6; l=1148e-6; f1 = @(beta)tan(beta*l); f2 = @(beta)2*h*beta*K./(K^2*beta.^2-h^2); figure ...

1 day ago | 0

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Answered
How to obtain model parameters by fitting experimental data to the monod model. monod model.
It should be relatively straightforward to adapt your system to existing code. One example is Parameter Estimation for a Sys...

1 day ago | 0

Answered
How can i calculate PDF and CDF of non-parametric distribution?
I am not certain what your data are. If ,they are appropriate for the function, I would begin with the ecdf function, since it ...

1 day ago | 1

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Answered
Issue solving a non-linear differential equation in Matlab
‘Am I wrong?’ No. The result is not always as simple as it might be. In R2021a, the Symbolic Math Toolbox apparently simp...

2 days ago | 0

Answered
isosurface with wall thickness
There does not appear to be any way to change the thickness of the plotted surface. The best I can come up with is the revise...

2 days ago | 0

Answered
How can I plot integral of this equation?
Try something like this — % clc; figure('color','white'); while(1) sigma.phi=input('Enter 0.1 in a.u.: '); mu=input('Enter...

2 days ago | 0

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Answered
How to get the coefficients of a fractional polynomial from syms?
It is not a polynomial, so it is necessary to create it as one and then extract them. syms x, F=29.0*x*(5.7e-4*x + (5.58e-4*...

3 days ago | 1

Answered
How to find and chart the frequency of a letter in column with histogram.
Perhaps — Col = {'HFHFHSHHAJHJA'; 'HSAJHFGFSAGJ'; 'HSGHSFFJHJ'}; T = cell2table(Col) RowSum = cellfun(@(x)sum(x=='H',2),T{:,...

3 days ago | 0

Answered
Error with find(X) statement
Taking a wild guess, since the test is: states=find(sum(UNITARY_MATRIX)~=1.0) it is likely encountering floating-point approx...

3 days ago | 0

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Answered
vector gives 0 integral
There quite definitely is! In your call to it: sd = trapz((z),0,20) the function interprets ‘z’ (the parentheses aren’t n...

4 days ago | 0

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Answered
How to shade/color overlapped area in the graph?
I honestly have no desire to download ‘plotxx’ and learn its intricacies, so I used yyaxis instead here. The same approach sh...

4 days ago | 2

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Answered
Create line between plot points
Yes. x = [0 10 20 30]; y = [355 433 510 590]; figure plot(x, y, '*-r') grid Ax = gca; Ax.XMinorGrid = 'on'; Ax.YMino...

4 days ago | 0

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Answered
plotting a phase plane with a system of linear diff equations.
Using the numeric ODE solvers, likely the easiest way to do that is to use odeset to set options, and then choose 'OutputFcn', @...

4 days ago | 0

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Answered
Why am I getting a Parse error for a sequence?
It’s missing an equal (=) sign: for it = 1:MaxIt %this starts 'for' loop and runs for MaxIt times. .

4 days ago | 1

Answered
Is there any way to do LFIT (general linear least-squares fit ) on the time series data using MATLAB?
That depends entirely on what you want to do. One approach: syms a b c d e f g t y = a + b*t + c*t^2 + d*sin(2*pi*t) + e*...

4 days ago | 0

Answered
Problem with reshape and Surf plot
The only solution I can propose is to use either griddata or scatteredInterpolant . Try this — opts = detectImportOptions('...

5 days ago | 0

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Answered
how to sort table by row sub-string values?
Try this — wellname = {'01A58' rand; '01A59' rand; '01A62' rand; '01A63' rand; '01A66' rand; '01A58' rand; '01A59' rand} well...

5 days ago | 0

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Answered
How to filter first fixation times for participants
I had no problems getting readtable to work correctly. I have no ides what the third loop here does, however it now works by ...

5 days ago | 0

Answered
What is the frequency of my signal?
Try this — LD = load('Frequency.mat'); t = LD.t; CH0 = LD.CH0; Fs = 0.1; ...

6 days ago | 1

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Answered
how to do average over third dimension?
Taking a slightly shorter example, try something like this — % ucom = randi(9,21,41,24); ucom = randi(9, 3, 4, 24); sz_ucom ...

6 days ago | 0

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Answered
How to pre-allocate my loop for speed?
I am not certain what the problem is, however the preallocation would be straightforward: pk_seagrass = NaN(1,length(ping_time...

6 days ago | 1

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Answered
Find energy for each second of audio file
Use the buffer function: Fs = 44.1E+3; % Sampling Frequency s = randn(Fs*5.2,1); ...

6 days ago | 0

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Answered
Does anyone know why the second plot doesn't work?
Yes! In line #44, there is a hold off call, although no new figure call, so the subsequent plot overplots the existing plo...

6 days ago | 0

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Answered
function interpolation and root finding
Try this — points = [0.500000000000000 0.500000000000000 0.498097349045873 0.494452298903742 0.49...

6 days ago | 1

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Answered
Please someone help test run this Matlab code and debug it if possible. Please help a student
The ‘uexact’ variable does not exist, and there is nothing similar to it (for example by a different spelling, at least that I c...

7 days ago | 0

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Answered
How to solve damped forced vibration analysis using ode45 ?
One problem is with the ‘dxdt’ assignment. MATLAB interprets the spaces as delimiters, so the second row has 3 columns, as MATL...

8 days ago | 0

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