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

Statistics

All

View badges

Content Feed

Answered
lsqcurvefit - initial condition
The problem with nonlinear parameter estimation is that the results can be highly dependent on the initial parameter estimates. ...

15 minutos ago | 0

Answered
Want to create a time vector
I have no idea what you want to do, although the linspace function may be a more precise approach — t = -10:0.01:10-0.01 ...

alrededor de 8 horas ago | 0

Answered
Why am I not getting the m array?
That clears up much. Plotting them is simply this — %% data X=[6,7,10,14,13,9]; Y=[12,9,7,8,10,14]; xi=10; yi=10; ...

alrededor de 22 horas ago | 0

| accepted

Answered
[SOLVED] Semi-colon not supressing output
I do not see any missing semicolons in the file, so the most likely problem is that there is one missing when you call the funct...

alrededor de 23 horas ago | 0

| accepted

Answered
How to Save Multiple Figures in Loop?
Perhaps this instead — saveas(gcf, sprintf('File%02d_6.tiff',i), '-dtiff'); Specifing the numeric field as '%02d' creates a t...

alrededor de 23 horas ago | 0

| accepted

Answered
An error in filtfilt
Your data matrix has 4 rows and 30800 columns, and in a matrix, filtfilt filters columns, so instead of: subs_cd1_alpha=filtfi...

1 día ago | 0

Answered
Sum, then filter, then re-separate data
It would help to have the sampling frequency. I am not certain what you want to filter, however for now I am assuming that is...

1 día ago | 0

| accepted

Answered
Audio Pitch Manipulation Through Time
I am not certain what you want to do. One option could be the resample: function.

1 día ago | 0

Answered
How to create a vertical offset line
Try something like this — zv = sort(rand(4,1)) % Define 'z' Val...

1 día ago | 0

| accepted

Answered
Define time axis interval for 100 samples
I am not certain what you want to plot. Perhaps — % sampling frequency (fs) is 6000 Hz fs1 = 6000; % I want to take 100 s...

2 días ago | 0

| accepted

Answered
Time + Acceleration Fourier transform into Amplitude + Frequency
The ‘Time’ values are not unique (they likely need an additional digit of precision) so they had to be processed by taking the m...

2 días ago | 0

Answered
create a function from temperature data
Another option: Curve fitting to a sinusoidal function

2 días ago | 0

Answered
Find the position of numbers in array
I am not certain what you are asking. Perhaps using the ismember (or ismembertol) function will do what you want.

2 días ago | 0

Answered
How to remove the AWGN noise from data?
I would simply use a moving average filter, for example movmean, or choose one of the options in smoothdata, to eliminate normal...

2 días ago | 0

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

3 días ago | 0

Answered
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...

3 días ago | 0

| accepted

Answered
Find the polar representation of (𝑖 − √3 )
Perhaps: phi = angle(1i - sqrt(3)) % Radian Angle Of Complex Number mag = abs(1i - sqrt(3)) ...

3 días ago | 0

Answered
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...

3 días ago | 0

Answered
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 ...

4 días ago | 0

Answered
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...

4 días ago | 0

Answered
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/...

4 días ago | 0

Answered
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...

4 días ago | 0

Answered
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 ...

4 días ago | 0

| accepted

Answered
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...

5 días ago | 0

| accepted

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

5 días ago | 0

Answered
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)...

6 días ago | 0

Answered
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.

6 días ago | 0

| accepted

Answered
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.

7 días ago | 0

Answered
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...

7 días ago | 0

Answered
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...

7 días ago | 0

| accepted