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Star Strider


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13,977 2012 年以降の合計貢献数

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PROFESSIONAL: Physician (M.D.): Diplomate of the American Board of Internal Medicine; M.Sc. Biomedical Engineering: Instrumentation, Signal Processing, Control, System Identification, Parameter Estimation

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how to transfer a setting from an old version to a new version
See: Importing/Exporting Preferences to a new MATLAB installation on a new computer and How do I import my MATLAB path preferenc...

約2時間 前 | 0

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create 5 minute bar intervals of time data
I would take the 5 minute mean (or median,or something else) using the retime function. See specifically: Specify Time Step o...

約5時間 前 | 0

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3D Matrix extraction and manipulation
That can be straightforward or slightly complicated, depending on how you want to do it. To extract the first 67 rows: M = ...

約7時間 前 | 0

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Contaminate an EMG with 50 Hz signal
I have no idea what ‘isn’t working’ means. This version of your code works: Fs = 256; ...

約12時間 前 | 0

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How to color individual points on errorbar plot?
You need to plot with respect to an independent variable. Try this: means=[1 1 2 3 4]; standarddeviation=[0.1 0.2 0.2 0.3 ...

約16時間 前 | 0

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displacing iterations of a signal
I am not certain what you want to do. If you want the different waveforms to appear consecutively, plot them against an indepen...

1日 前 | 0

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How can I plot shaded confidence intervals on my plot?
Add these two patch calls after the last plot call and before the hold off call: patch([x fliplr(x)], [y-CI fliplr(y+CI)], [0,...

1日 前 | 1

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how to obtain the frequency when doing the fourier trasform
Assuming that the data are regularly sampled, so that the sampling intervals are the same for all of them, I usually do somethin...

1日 前 | 0

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Month as a two digit number
To have leading zeros, it has to be a character array or string variable. Try this: Date = datetime('now'); mth = sprintf(...

1日 前 | 2

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Designing a fir filter and how to apply it to a signal
You need to normalise the stopband frequencies by the Nyquist frequency. Try this: Wn=[fp1 fp2]/(fs/2); That worked when I...

1日 前 | 0

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Energy calculation via current signal integration with limits
Add this after your posted code: idxrng = iVs:iVe; IntP = cumtrapz(T(idxrng), P(idxrng)); figure subplot(3,1,1) yyaxis l...

1日 前 | 0

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Contour plot of data on a non-rectangular xy domain
I am not certain what you want. Try this: X = [0.940727422583647 1.07008276356436 1.22692065834036 1.36057673106938 1.47757...

1日 前 | 0

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Position and extraction of row
It would definitely help to see what ‘mergetable1’ is, and how you are getting ‘AccelSN’. If ‘AccelSN’ is read as a string (f...

2日 前 | 0

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signal fourier transform include unit step function
Try this version of your code: syms t x(t) % t = linspace(-20, 20, 5000); % u = @(t) (t >= 0); x(t) = exp(-t) * heaviside...

2日 前 | 0

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Matlab dsolve function issue with format.
My (R2020a) version requires slightly different symbolic convetions. Try this: syms x(t) Dx = diff(x); D2x = diff(Dx); e...

2日 前 | 0

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Extraplotation of impedance data
First, I doubt that extrapolating from 250 kHz to 10 MHz is appropriate in any event. However it could be, if you identified ...

2日 前 | 0

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Why I can't use the function of decimate
I get the same result as in the documentation (in R2020a). First, what version of MATLAB are you using? The current online d...

2日 前 | 0

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determine the R waves to evaluate the ECG signal and determine the heart rate.
Use findpeaks or islocalmax to locate the R-wave peaks.

3日 前 | 0

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Rolve function around axis to create 3D surface.
See: Plotting an exponential exp(-x), in 3D? for an example.

3日 前 | 1

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Error using ss. How do i fix this?
Transpose ‘BS’ to a column vector (everywhere you use it, since you re-define it): BS=[0 0 0 0 0 0 k4/m4 0].'; Do the same f...

3日 前 | 1

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Initial Conditions for first derivative defined as a transfer function
Apparently, step does not allow initial conditions to be stated, however initial does, and produces an impulse response plot giv...

4日 前 | 0

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turning functions into floating-point numbers
Your question lacks detail. If you have an expression in one or more variables, you can express it as a function (most likely a...

4日 前 | 0

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need help on nomenclature, Simplify symbolic variables
If simplify is not simplifying to the extent that you want it to, use the Steps name-value pair to tell it to keep simplifying u...

4日 前 | 0

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create yyyymm variable from date
Try this: dt = '1/1/2020'; Out = datetime(dt, 'InputFormat','MM/dd/yyyy', 'Format','yyyyMM') producing: Out = dateti...

4日 前 | 0

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Resampling Data using Interp1
You are doing signal processing. For that, use the resample function. It will do the interpolation, and will also use an anti-...

4日 前 | 0

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Can ode45 be used to solve mx'' + cx' + kx^1.1=0 x(0)=5;x'(0)=0? Getting complex numbers in answers.
You need to plot the real and complex parts separately. Assuming: [t,y] = ode45(yourOdefcn, tspan, ic); plot it as: fig...

4日 前 | 0

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How to show numeric solution instead of symbolic solution
The ‘q_dot’ variable cannot be expressed as a strictly numeric array because it contains symbolic variables. The best you can...

4日 前 | 0

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Jacobian matrix of a numeric matri
See if the gradient function will do what you want. That is likely as close as you can get for a numeric matrix. If it is a ...

4日 前 | 0

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Second Order ODE with Power
The best way to integrate it numerically is something like this: syms x(t) A B C D vb b Y t v=diff(x,t,2)==(A/x)*(B+C*(diff(...

4日 前 | 0

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Running data through a filter multiple times
It is not easy to follow what you are doing here, especially with respect to your using the strings as part of the subscript (th...

5日 前 | 1

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