Star Strider

Last seen: Today

14.614 total contributions 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.

Contact

Star Strider's Badges

View details...

Answered
How do I add variables into a string within a table?
The only option appears to be to turn the string variable into a char array first: str = "0001336363"; strc = char(str); Out...

etwa 8 Stunden ago | 0

| accepted

Answered
Computing findpeaks along 3-Dimensional matrix
I am guessing here, since I do not have your data. Since findpeaks is going to return vectors for the peaks, locations (and oth...

etwa 9 Stunden ago | 0

Answered
Fill in a Polar Scatter Plot
Do everything in Cartesian coordinates, although defining the coordinates in terms of and . Then, use pol2cart to create them ...

etwa 9 Stunden ago | 0

Answered
finding the exact points of Zero crossing using interpolation method
You are plotting the values of the data at the indices that ‘zci’ returns, not the interpolated aero-crossings. It would be b...

etwa 13 Stunden ago | 0

| accepted

Answered
how do i find minimum value of function with matlab?
I agree with you that using the diff function is the appropriate way to begin.

etwa 14 Stunden ago | 0

Answered
Can't plot polyfit
The polyfit function also needs to know what degree of polynomial you want to fit: p = polyfit(x,y,n) where ‘n’ is the degree...

etwa 15 Stunden ago | 0

Answered
Matlab code and filterDesigner give different plots for the same setting of Chebyshev II bandpass filter?
I suspect that filterDesigner uses the second-order-section implementation of the filter. You should, as well. Change: [...

etwa 16 Stunden ago | 0

| accepted

Answered
How to find the width of plotted graph at selected Y-axis level?
Try this: lambda = linspace(0.4, 0.6); % Wavelength Vector s = sinc(((0.47:0.02:0....

etwa 17 Stunden ago | 1

| accepted

Answered
how to get the value of x, from this equation: 0.2exp(x)-x^(0.25) = 0
I do not understand what the problem is: fun = @(x) (0.2*exp(x)-x.^(0.25)); x0 = [1.5,0]; x = fsolve(fun,x0); xv = linspac...

ein Tag ago | 0

Answered
2 Scenario Legend Setup
See the Line Properties documentation on DisplayName. That might do what you want.

ein Tag ago | 0

Answered
Change datetime display format
It is possible. It just takes some coding gymnastics: tj = 2.456870501842000e+06; mtime = datetime(tj,'ConvertFrom','juliand...

ein Tag ago | 1

| accepted

Answered
how to get a cdf plot of my data
Try this: [f,x,flo,fup] = ecdf(fitness); figure loglog(x, f) hold on plot(x, [flo fup], '--r') hold off grid legend('...

2 Tage ago | 0

| accepted

Answered
syms 0-by-1
Ther problem is that ‘eqn’ evaluates to: eqn = 5863/20 == 923 so there are no variables in it to solve for.

2 Tage ago | 0

Answered
Displaying random numbers as a graph
One approach is to use the inpolygon function: x = linspace(0, 10); y = exp(-(x-5).^2)*0.2; r = rand(1000,2).*[10 0.25]; [i...

2 Tage ago | 1

| accepted

Answered
Creating a Filter and applying it
See: Realize or Apply the Filter to Input Data

3 Tage ago | 1

| accepted

Answered
Unit of FFT in matlab
The fft function does not change the units of the time-domain argument it is given. The fft function produces a double-sided ...

3 Tage ago | 0

Answered
Predictions for stepwise regression model
No predict function is defined for stepwisefit. One is defined for stepwiselm: m = stepwiselm(matrix , Y) prediction1 = pr...

3 Tage ago | 0

| accepted

Answered
Create a row vector of the diagonal elements from matrix.
Meet the diag function!

3 Tage ago | 0

| accepted

Answered
How do you use values from an array as serial numbers to extract values from a different array?
It is not possible to reference ‘row 0’ since MATLAB subscripts begin at 1. I am not certain what you want, so see if this sh...

3 Tage ago | 0

Answered
How to mix multiple audio signals in Matlab?
It is somewhat difficult to follow your code (and I cannot run it since my version of MATLAB can only run actual code, not image...

3 Tage ago | 0

Answered
Residual values for a linear regression fit
I would do something like this: x = [1,1,2,2,3,4,4,6]'; y = [8,1,1,2,2,3,4,1]'; xv = x; yv = y; for k = 1:numel(x) ...

4 Tage ago | 0

| accepted

Answered
ode45 failing but other solvers work fine
Run this from your Command Window or a script: which ode45 -all You should only get: C:\Program Files\MATLAB\R2020b\toolbox...

4 Tage ago | 0

| accepted

Answered
How can i visualize ecg contain 12 leads in 12 different figures
This is the standard format for EKG record display: EKGD = load('temp.mat'); EKG = EKGD.signal; Leadc = {'I','II','III','a...

4 Tage ago | 2

| accepted

Answered
Use vectors to index an 2D array
Use the sub2ind function to create linear indices from the subscripts: X = [1 2 3 4]; Y = [4 3 2 1]; A = zeros(4); Lidx =...

4 Tage ago | 1

| accepted

Answered
Plot range of values in a bar graph
I was not certain what result you wanted when I replied to your Comment to Plot range of values as bars. I gave a sort of gener...

4 Tage ago | 0

Answered
How to find x-values when y-function equals a set value?
Try this: x = linspace(0.54, 0.61); % Create Data y = exp(-(x-0.58).^2*1E+4); ...

4 Tage ago | 0

| accepted

Answered
changing sampling rate of an audio
Import the file, then use the Signal Processing Toolbox resample function to resample it to a different sampling frequency.

4 Tage ago | 0

Answered
Converting Frequency domain to time domain
‘How do I convert it into Acceleration vs time data using ifft function.’ Thet depends entirely on what the data are. If you...

4 Tage ago | 0

Answered
Trying to Plot feedback system
The image is a bit difficult to read. The error appears to be thrown with the step call. This may likely be due to your having...

5 Tage ago | 0

Answered
raise power to power in title
Try this (using LaTeX): figure plot(rand(50,1), rand(50,1), 'p') axis([0 1 0 1]) title('$y = x \times e^{- \frac{x^2}{2...

5 Tage ago | 1

| accepted