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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Could someone please explain me this code?
That looks like something I wrote! It would be helpful to know the context (I don’t remember where I posted it), however it a...

약 3시간 전 | 1

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Integrating a 2nd order ODE
This is a boundary value problem. Use bvp4c to solve it. syms y(x) x L Y q(x) = 2*cos(pi*x/L); Dy = diff(y); D2y = diff(...

약 4시간 전 | 0

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How can I call half of text by using "textread" ? (1*4096 matrix to 1*2048 matrix)
I have never used textread, however that could be described in the format string, for example — formatStr = [repmat('%f',1,204...

약 7시간 전 | 0

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I don't understand what this means or how to do it
I would imagine that ‘the next question’ wants the result at some very large valur of ‘t’, however that assumes that the fractio...

약 7시간 전 | 0

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my fminsearch function doesn't get the optimum values
The fminsearch function searches for a minimum. To get a maximum, negate the function — [x,fval] = fminsearch(@(x)-tut2(x),[1...

약 13시간 전 | 1

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plotting a for loop returns Empty Graph
I’m not certain what you want, however it is necessary to subscript the varialbes to be plotted. This runs without error and ...

약 14시간 전 | 0

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Area between three curves
Try this — I created the comparisons as ‘>=’ so change those to simply ‘>’ ito make the comparisons strictly ‘greater than’. ...

약 14시간 전 | 0

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Hi, I want to know knee point of a curve including the process of by 2nd derivative. Can anyone help by creating the script.
Use the gradient function to calculate the numerical derivative — x = linspace(0, 10); y = exp(-0.1*x) .* sin(x); D1 = g...

약 18시간 전 | 0

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how can I plot 3d in matlab
Another option is the waterfall plot. .

약 18시간 전 | 0

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I have to use Fourier Transform without frequency range?
One approach — A = [1 0.43 0.95]; B = [0.97 0.43 0.97]; [h,t] = impz(B,A); figure subplot(2,1,1) plot(t, h) grid ...

1일 전 | 0

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Turn multiple columns into one column
The code is a bit difficult to follow. I’m guessing here that you want to save the ‘allfrequency’ vectors. allfrequency(s,:)...

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To find the average of values in matrix
Try something like this (assuming that they are stored as elements of a cell array similar to these) — C = {randn(131,160), ra...

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Index exceeds the number of array elements in ODE using anonymous function
There’s a typo: 1/L13*(x(24) - (x(30)/C15 + (x(25) - x(31))*R1) - x(25*RL13)); ...

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plotting two lines intersecting at a certain point
Another approach — Temp=[25 26 26 26.5 27 27 27.5 28 28 28.5 29 29 29 29 29 29 29 29 29 29 29 29 29 28.5 28.5 28]'; vol=[0:...

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Incorrect datatype when using 'retime' function
The retime function works only with timetable arrays, to the best of my knowledge. See if using the table2timetable funciton fi...

1일 전 | 0

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Bug in equality checks? 28.15e-3 == 28.15/1000 false
Wellcome to the world of floating-point approximation error! See Why is 0.3 - 0.2 - 0.1 (or similar) not equal to zero? and...

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Problems with the three-parameter Weibull distribution
Those lines estimate the parameters of the distribution using Maximum Likelihood Estimation with the mle function, so look throu...

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how to write an Algebraic Equation in Matlab
I am not certain exactly what you want. See if this works — C = 31 Vinitial = 310 Vfinal = 320 Energy_stored_in_a_Capaci...

2일 전 | 0

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How to Calculate the 1% value of using gevfit
The gevinv funciton will likely do what you want, given the parameters. Copying from the image — X = gevinv([0.01 0.99], -0...

2일 전 | 0

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I didn't know how to find r
A different approach — ac = 6*18*18 as = @(r) (4*pi*r.^2) r = fzero(@(r) ac - as(r), -1) Check_Equal_Areas = ac - as(r)...

2일 전 | 0

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Plot how the input changes
Try something like this — b = @(m,x,y) y-m.*x; x = 1; m = linspace(0,10,11); y=2; figure plot(m, b(m,x,y)) grid xla...

2일 전 | 1

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Function output is returning equation not value
If ‘rad’ is purely numeric (no symbolic variables), use the double function to onvert it to a double value. Also consider usi...

3일 전 | 1

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how to solve error using integral
Not certain what the desired result is, however everything here are arrays or vectors, so use trapz instead, since there are no ...

3일 전 | 0

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Array of the number of days in the month of February this year
Numer of days: eomday Array of days: calendar .

3일 전 | 1

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The longest consecutive values in a vector and the position at which it starts and ends
One approach — A = [35, 25, 40, 20, 20, 30, 30, 30, 30, 30, 9, 20, 30, 10, 30]; [Au,~,ix] = unique(A, 'stable'); Tally = a...

3일 전 | 0

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How do I generate a pdf from some known percentile values
A slightly different approach — prctiles = [5 10 30 33 50 67 70 90 95]; SLR = [3.2760 3.5265 ...

5일 전 | 1

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Data Recovery for the Original Image
See for example: How do I extract data from MATLAB figures? Use the saveas function to save the resulting figure as a .png imag...

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how to change the front size and the inclination in a bar graph
‘2- how can I get the name to be written normally( those low characters should be on the same level as others)’ ‘Escape’ th...

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Convolution of two Gaussian functions without conv
Just choose any arbitrary vector for ‘z’ that is long enough to completely support the signals to be convolved. For a Gaussian,...

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Finding top and bottom 10% of data
If the Statistics and Machine Learning Toolbox is available, use the prctile function — x = randn(1,20) ...

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