Community Profile # 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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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 ...

8 hours ago | 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,:)...

8 hours ago | 0

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...

8 hours ago | 0

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)); ...

13 hours ago | 0

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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:...

14 hours ago | 0

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...

14 hours ago | 0

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...

15 hours ago | 1

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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...

16 hours ago | 0

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...

1 day ago | 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...

1 day ago | 0

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)...

1 day ago | 0

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...

1 day ago | 1

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...

1 day ago | 1

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 ...

1 day ago | 0

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

2 days ago | 1

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...

2 days ago | 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 ...

3 days ago | 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...

3 days ago | 0

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...

4 days ago | 0

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,...

4 days ago | 1

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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) ...

4 days ago | 0

Hello Everyone, I need to pass a low pass filter in this plot and I can't find the best way to do that. Someone can help me? Thanks.
Use the freqz function (or freqs linked to in that documentation page, if it is a continuous-time filter) — [b,a] = butter(8...

4 days ago | 0

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Why do I get "Array indices must be positive integers or logical values"?
MATLAB does not recognise implicit multiplication, so the missing multiplication operator vt=vf(1-exp(-t/tao)); ↑ ← HERE ...

4 days ago | 0

Why do I get "Array indices must be positive integers or logical values"?
MATLAB does not recognise implicit multiplication, so the missing multiplication operator vt=vf(1-exp(-t/tao)); ↑ ← HERE ...

4 days ago | 0

My graph won't display when I run my code. How do I get it to show?
Without seeing the ‘myFunc’ code, there is no way to provide a meaningful reply. The most likely result is that with: ICs=...

4 days ago | 0

How do I change the values ​​of the axes?
Try something like this — x = linspace(0, 21, 25); y = rand(size(x)); figure plot(x, y) xt = get(gca, 'XTick'); xtv = l...

5 days ago | 0

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Ignore NaN values in a Table
Since the Question appears to apply to the prod funciion, see the section on Product Excluding NaN. (I am not certain when that...

5 days ago | 0

How to change the values of both axes
There are ways to change the exponent display of the axis rulers using the NumericRuler Properties, however that is not necessar...

5 days ago | 0

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How do i define a variable as a function?
I suspect this works the similiarly in Maple (that I do not currently have) — syms t theta(t) f=cos(theta(t)); dfdt(t) =...

5 days ago | 0

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