Community Profile # Star Strider

Last seen: Today 2012 이후 활성

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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Change char to cell
I am not certain what the desired result is. Perhaps this (using num2cell) — s = ['abcd'; 'efgh'] c = num2cell(s) .

11분 전 | 0

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find the intersection of the four corner and trim the value out of the corner
Solve for the intersections, then plot to those limits — grid on syms stress1 stress2 shear12 SL_Ts=1800; SL_Cm=1400; ST_T...

약 11시간 전 | 0

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Integration of a function having constant parameter
Try this — syms a x F = int((4*a - 2*x + 4*a*x - 3*a*x^2 - 2*a*x^3 + a*x^4 - x^2 + x^3), x, 0, 1) Ffcn = matlabFunction(F) ...

약 12시간 전 | 1

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plot nonlinear equation in x y coordinate
Try something like this — syms x y SL_Ts=1800; SL_Cm=1400; ST_Ts=40; ST_Cm=230; SLT=100; k=((x^2/(SL_Ts^2))-((x*y)/...

약 12시간 전 | 0

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Interpolated contour plot with excel data
I’m guessing as to what ‘x’ and ‘y’ are, however it will be easy to reverse them if I guessed wrong. T1 = readtable('https...

약 12시간 전 | 0

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Try this — LD = load('conc.mat'); conc = LD.conc; t=[0;30;60;120;300;600;900]; figure plot(t, conc) hold on shadeWidth...

약 12시간 전 | 0

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The differential equaton apparently does not have an analytic solution. Integrating it numerically is an option — syms y(x)...

약 18시간 전 | 0

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ode89 and ode78 are unrecognized in MATLAB 2021a
From the last line in the ode78 and ode89 documentation — Introduced in R2021b .

약 20시간 전 | 1

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Find a y axis increasing point in a plot -
Try something like this — x1 = -2:2; y1 = [0 0 1 0 0]; x2 = linspace(-2, 2); y2 = interp1(x1, y1, x2); [maxy2,idx2] ...

약 21시간 전 | 0

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Error: This statement is incomplete.
I strongly advise against using eval. Put all of the arrays into a cell array, and then address them appropirately — year...

약 22시간 전 | 1

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Locating z-values at certain x-values
I am not certain what the desired result is, sp[ecifically finding the ‘z’ values that correspond to ‘x_sea’ or the reverse. ...

약 23시간 전 | 0

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Weibull distribution plot x-axes scale is wrong
Try something like this — %% Weibull [parmHat, parmCI]=wblfit(Cont_Wh_Wp); scale= parmHat(1); shape=parmHat(2); figure...

1일 전 | 0

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Find roots of a first order differential equation
Try this — r = 1; x = linspace(-2*pi, 2*pi, 25); y = Function(x,r); zxidx = find(diff(sign(y))); ...

1일 전 | 0

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Problem with multi-layer antenna design using Antenna Designer
The ‘Index cannot exceed 0’ message indicates that there is nothing in the array being indexed (it is empty, indicating that it ...

1일 전 | 0

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this plot3 looks 2D on live script (pointing downwards as it should), and 3D (pointing sideways for no reason), why?
I cannot run that since the data are missing. However to see it in all its 3D glory, use the view function to rotate the came...

1일 전 | 0

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Array Indexing and Function Handling question.
It would be necessary to define ‘F’ in terms of a single parameter vector — F = @(xy) [3*xy(1)+xy(2).^2 , xy(1).^2+3*xy(1)-1];...

1일 전 | 1

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How to put endpoint on Bar graph
In R2021b, this is straightforward (and described in Specify Labels at the Ends of Bars). y = [75.8 78.05; 81 80.30; 91 80...

1일 전 | 1

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how can I change my time so that it takes frequency 1/250 hz
If is the sampling interval, multiply it by the sampling instants to convert them to time — C = readtable('https://www.math...

1일 전 | 0

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How to plot color ball use matlab?
This is an interesting problem! This should get you started — Facets = 40; numPatches = fix(Facets/5); [X,Y,Z] = sphere(F...

2일 전 | 2

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split an audio file
Unless it is absolutely necessary to use reshape, use buffer instead. It is just easier. It only operates on one vector at a...

2일 전 | 1

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matlab font 2021b
There is likely a way to set this programmatically, however the easiest way to change the fonts is to click on Preferences, then...

2일 전 | 0

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How do I increase the x-axis to make my action potentials bigger
The X-limits need to be reduced in order to show the detail, and the last subplot needs to have its axes rescaled to show the de...

2일 전 | 0

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Symbolic ODEs aren't symbolic?
Because of the ‘R*s’ terms, the system is nonlinear. The vast majority of nonlinear differential equations do not have analytic...

2일 전 | 0

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How to calculate the duration of data points in days

3일 전 | 0

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Error in ode45 (line 115) and odearguments (line 90)
There were two errors. First: dydt(2)=y(2)*(1-y(2))*((y(1)*(or*rr-br*re)-ar*rr); ↑ ← EXTRA UNMATCHE...

3일 전 | 0

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How to avoid using a loop here?
One approach — N = 5; tic [m,n] = ndgrid(1:N); A = 2*N + 1 - (m + n) toc Compare — tic A = zeros(N); for m = 1:N ...

3일 전 | 0

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Timeformat from HH:MM:SS to HHMMSS
Try this — time = datetime('12:30:00', 'InputFormat','HH:mm:SS', 'Format','HHmmSS') .

3일 전 | 0

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Replace comma with dot after fopen
For MATLAB versions R2019a and later, the readmatrix function permits definition of the 'DecimalSeparator' (see the Text Files O...

3일 전 | 0

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How to solve an ODE calculating the value of a variable inside a loop?
The problem is: x0 = X(end); so the error only occurs after the first iteration. The solution is: x0 = X(end,:) and thi...

3일 전 | 1

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how can I get the following graph from this data, changes are required in the code