Community Profile

photo

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
  • Most Accepted 2021
  • Revival Level 3
  • Personal Best Downloads Level 2
  • 5-Star Galaxy Level 3
  • First Submission
  • Grand Master
  • 36 Month Streak
  • Thankful Level 4
  • Knowledgeable Level 5
  • First Answer
  • Scavenger Finisher
  • Solver

View badges

Content Feed

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...

18 hours 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 ...

20 hours 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)...

1 day 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.

2 days ago | 0

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.

2 days 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...

2 days 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...

3 days ago | 0

| accepted

Answered
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 days ago | 0

Answered
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 days ago | 0

| accepted

Answered
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 days ago | 0

| accepted

Answered
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 days ago | 1

| accepted

Answered
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 days ago | 0

| accepted

Answered
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 days ago | 0

| accepted

Answered
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 ...

3 days ago | 1

| accepted

Answered
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 days ago | 0

| accepted

Answered
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 days ago | 0

| accepted

Answered
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 days ago | 0

| accepted

Answered
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 days ago | 1

| accepted

Answered
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 days ago | 0

| accepted

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

6 days ago | 0

Answered
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 days ago | 0

Answered
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 days ago | 0

Answered
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 days ago | 0

| accepted

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

6 days ago | 0

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

6 days ago | 0

| accepted

Answered
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...

6 days ago | 0

| accepted

Answered
When calling a user defined function, MATLAB throws an error for simple matrix multiplication
It is best to not use global variables. The problem is that they have to be defined in the calling routine as well as the funct...

7 days ago | 1

| accepted

Answered
How can I get txtscan to read this file?
It would help to have the file to experiment with. If textscan is only reaidng the first line, consider adding: 'EndOfLine'...

7 days ago | 0

| accepted

Answered
Can't generate histfit subplot (error using histfit, subscripting into a table)
The error is in the histfit code at line 69. That reference has nothing to do with your code or data. The problem is likely ...

7 days ago | 0

| accepted

Answered
Relative occurance of intersect values
The intersect funciton can output the indices of the intersecting elements. See Intersection of Two Vectors and Their Indices f...

7 days ago | 0

| accepted

Load more