# Star Strider

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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**Content Feed**

Numeric array to serial datetime

Perhaps something like this — Feed{:,1} = datetime('29-Sep-2022'); Feed{:,2} = '14.45'; DT = Feed{:,1} + timeofday(datetime(...

etwa 10 Stunden ago | 0

Legend colours are different from the plot

Thank you for the ‘r’ anonymous function! I can now run your code. The code was plotting the contours as well as the vector...

etwa 11 Stunden ago | 0

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How to interpolate a set of data with the cubic method?

See my Answer to your duplicate question How to interpolate a set of data with the cubic method?.

etwa 12 Stunden ago | 0

Find the polar representation of (𝑖 − √3 )

Perhaps: phi = angle(1i - sqrt(3)) % Radian Angle Of Complex Number mag = abs(1i - sqrt(3)) ...

etwa 12 Stunden ago | 0

How to interpolate a set of data with the cubic method?

Since you apparently want to find the independent (‘x’) variable where the dependent (‘y’) variable is 600, it will be necessary...

etwa 13 Stunden ago | 0

How to implement either a High/Low Pass filter on accelerometer data.

‘For my accelerometer, I set the output data rate to 50hz so the bandwidth would be 25hz and sampled at 10hz (10 times /sec) to ...

ein Tag ago | 0

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...

ein Tag ago | 0

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/...

ein Tag ago | 0

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...

ein Tag ago | 0

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 ...

ein Tag ago | 0

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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...

2 Tage ago | 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 ...

2 Tage ago | 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)...

3 Tage ago | 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.

3 Tage ago | 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.

4 Tage ago | 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...

4 Tage ago | 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...

4 Tage ago | 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...

4 Tage ago | 0

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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 ...

4 Tage ago | 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.

5 Tage ago | 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...

5 Tage ago | 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.

5 Tage ago | 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...

5 Tage ago | 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 ...

5 Tage ago | 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...

5 Tage ago | 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...

5 Tage ago | 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; ...

5 Tage ago | 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).'; ...

5 Tage ago | 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...

6 Tage ago | 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.

7 Tage ago | 0