Community Profile # Star Strider

Last seen: Today 2012 以来アクティブ

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. Time Zone: UTC-7 (Standard); UTC-6 (Daylight Savings/Summer)

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I have an equation that relies on previous values to get the next.
I am not certain how the ‘P’ vector enters into this. If: P1 = P(1) = 1 P2 = P(2) = 2 P3 = P(3) = 3 in this instance, then...

Please Help me, How to raise the quality of the attached figure after drawing it on Matlab
What do you want to do with it? F = open(websave('T','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1138680/...

How to solve 2nd ODE equation in numerical and analytical method at same plot graph?
See my Answer in How to solve 2nd ODE equation in numerical and analytical method at same plot graph? and make the appropriate c...

How to solve 2nd ODE equation in numerical and analytical method at same plot graph?
Interesting problem! I was curious enough to do the entire simulation to see what the results are — syms x(t) x0 Dx0 T Y ...

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fft of a signal
You need to normalise the fft result by the length of the signal: X_fft = fft(y1,nfft)/L; Otherwise, using my test signal, it...

1日 前 | 0

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Smoothing data with sgolay filter
The default order for the 'sgolay' option is 2 (quadratic), however the 'SmoothingFactor' controls the window length (framelen ...

1日 前 | 0

How can I draw the transfer function spectra by matlab?
The ‘spectrum’ is the Bode plot: z = tf('z'); H = 5 / (1 + 2*cos(5)*z^-1 + z^-2); H.Variable = 'z^-1' figure bodeplot(H)...

2日 前 | 0

Find the relaxation Time from data set
See my latest Comment in find fitting equation and parameters to fit damped oscillations curves from set of data.

2日 前 | 0

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sums up the same rounded numbers in 5-digit decimal arithmetic in n = 10, 9, 8, ..., 3, 2, 1
See the documentation for colon, : and go from there.

3日 前 | 0

how to avoid getting 0 overlap on the pie chart?
The code was not returning the correct position vectors. I am not certain what you want to do. This repositions the ‘5%’ t...

3日 前 | 0

contour() function plots with a solid background (and not a transparent background, which is desired)
Perhaps something like this — [X,Y,Z] = peaks(50); figure surf(X,Y,Z, 'EdgeColor','none') hold on contour3(X, Y, Z, 'Col...

3日 前 | 0

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How to plot bode?
We need to know more. If you have the Control System Toolbox (or the System Identification Toolbox, or both) licensed and ins...

3日 前 | 0

The upsample function is not working R2022b
I can find two upsample functions in the online documentation, one in the Signal Processing Toolbox (that should work with your ...

3日 前 | 0

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Putting measurement unit and origin in plot
I am not exactly certain what you want, however the xlim and text functions would likely be appropriate.

3日 前 | 0

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Can anyone please tell me how to plot this graph?
Use the polarplot function. It should do evertything you want. For details see PolarAxes Properties and perhaps also Line Pr...

3日 前 | 1

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bode magnitude producing different plots for the same transfer function
The upper plot is plotted with a linear magnitude and the lower one is plotted with the magnitude in decibels.

3日 前 | 0

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Extract data points from bodemag plot
it would likely be easier to use the approach bode in Obtain Magnitude and Phase Data. (Remember to use the squeeze function wi...

3日 前 | 0

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Add axes x and y labels (or title) to a scatter plot, not using tbl notation
Delete the equal sign in the xlabel, ylabel, and title calls — A_full = rand(1,570); B_30_channels = rand(1,570); figure ...

4日 前 | 1

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Fix the random values
The rng function controls the seed. Example — rng(1) r1 = randi(9,1,10) rng(1) r2 = randi(9,1,10) There are a numbe...

4日 前 | 0

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How can I get a bode magnitude to be a certain size vector?
The bode function allows you to specify a vector of frequencies in radians/time_unit.. See the documentation section on Bode Pl...

4日 前 | 0

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How can I compute envelope for three phase current?
I am not certain what you want. Perhaps this — Fs = 0.0001; t = linspace(0, 1, 1/Fs)/Fs; s = sin(2*pi*t*60 + deg2rad([0; ...

4日 前 | 0

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how can i save my values of u into a vector, so i have the result of all the u-values.
The loop is not necessary. Just use matrix multiplication. One approach — x=(0:0.1:1).'; ...

4日 前 | 1

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find fitting equation and parameters to fit damped oscillations curves from set of data
I can approximate the fit, however not to the oscillations. The best model is a mathematical model of the process that create...

5日 前 | 0

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Solve system of equations
Solve the first equation for and then plot both of them as functions of using the hold function.

6日 前 | 0

Best Fit Line for Parabola
Try something like this — x = [0; 0.019; 0.036]; y = [0.015; 0.25; 0.05]; p = polyfit(x, y, 2) xv = linspace(min(x), max(x)...

6日 前 | 0

vpasolve accuracy in two equations with two variables
I am not certain what problem you are having. One option is to solve the equations and then use vpa on the solutions. Exam...

6日 前 | 0

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How to find the maximum value by comparing 2 cells?
This is not as efficient as I would like it to be, however it works — A = {2,4,5}; B = {1,10}; MaxC = max(cellfun(@(x)max([x...

6日 前 | 0

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Finite Impulse Response filter
I thought about doing this with an optimisation funciton, however it minimises the distance between the estimated transfer funct...

6日 前 | 0

FIR_Filter Kaiser
I am not certain what the problem is. Try something like this — fsamp = 12000; %sampling rate fcuts = [1800 2000]; %indic...

6日 前 | 0

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How to find monthly average from daily data?
You will need to combine the year, month, and day into one datetime array, and then replace the individual variables with the da...

7日 前 | 0

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