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Star Strider


Last seen: Today
14,513 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.

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Answered
fitnessfcn: Not enough input arguments.
It would help to see your ga call. When I run your function using this ga call: Xest = ga(@objfun, 4) it produces (in one ...

3 hours ago | 0

Answered
How do I get the differential of Hermite polynomial function?
Did you run the code you posted? When I run it (in R2020b): syms m1 x DHx = diff(hermiteH(m1, x),x) I get: DHx = 2*m1...

3 hours ago | 0

Answered
Isolating a phase bode plot from the function bode(sys)
It would be easier to just get the output and re-plot it. See Obtain Magnitude and Phase Data.

4 hours ago | 1

Answered
How to format numbers in exponential notation with base 1e3
This will correctly calculate tha mantissas: rfxm = @(x,xpnt) [sign(x).*10.^(log10(abs(x))-xpnt)]; % Anonymo...

5 hours ago | 0

Answered
Practical use of Phase Delay for IIR Filter on Pure Sinusoid
To avoid the phase shift, use the filtfilt function instead of filter.

5 hours ago | 0

Answered
Plot serial date of excel into MATLAB
The first column is numeric representation of yyyymmdd so there are likely several ways to create a datetime array from it. T...

6 hours ago | 0

Answered
Why is the following numerical integration not working?
Try this: TMD = integral2(@Optics,0,2,0,2*pi); (I did not run your code, so there may be other errors as well.)

6 hours ago | 0

Answered
How to curve fitting a cosine function with exponential decay tau?
Try this: y = detrend(y); % Remove Linear Trend yu = max(y); ...

15 hours ago | 0

Answered
how to make group by extracting data?
I am not certain what you want to do. One problem is that the elements of ‘CM’ appear to be outside the range of (-9,9). In an...

16 hours ago | 0

Answered
Count the number of times a value appears in a row and save the row number
Try this: rowsum = sum((A <= 1.5), 2); result = find(rowsum >= 3) producing: result = 1 2 3 4 ...

16 hours ago | 0

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Answered
How to extract specific data?
Try this: a1 = [10 20 30 40 50 60]; b1 = [11 21 31 41 51 61]; c1 = [12 22 32 42 52 62]; e = [0 3 6]; abc = cat(1, a1, b1, ...

17 hours ago | 0

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Answered
ı want to plot he gradients and iso curves of a function
See How to plot gradients ? for a recent example.

21 hours ago | 0

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Answered
quadratic equation function help
Your function file must be saved somewhere on your MATLAB user path as: quadFunc.m so you can use it. If you are unfamiliar w...

22 hours ago | 0

Answered
Plotting Multivariable x, y, and z for a data set
The problem is with your choice of coordinates. When I ran your code, it threw: Warning: The underlying triangulation is em...

23 hours ago | 0

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Answered
Find z value out of x and y values from a countour in command window
Clicking on the contours will only show you the level of the contour. To see the value labels of the contours use ShowText: c...

23 hours ago | 0

Answered
Solving (non-linear equation) for a single unknown?
If you want to use the Symbolic Math Toolbox for this, use solve not fzero: syms M P4 = 0.448159 P1= 0.101325 y=1.4 equ1...

23 hours ago | 0

Answered
3d graph to compare curves with given x, y, z values
Try something like this: x = 0:31; y = 0:8; [X,Y] = ndgrid(x,y); % Create [X,Y] Grids Z1 = 2...

24 hours ago | 0

Answered
What does the 'metric' parameter means in imfindcircles?
It means how ‘round’ the objects are. See Step 5: Determine which Objects are Round for a more complete description.

24 hours ago | 0

Answered
How to calculate 90% confidence interval
Use the paramci funciton: abc = readmatrix('abc.txt'); Inabc=log(abc); pd = fitdist(abc,'Normal') ci10 = paramci(pd, 'Alpha'...

1 day ago | 0

Answered
minutes to hour and minutes
Use the (:) subscript convention to forec the ‘mins’ argument to be a column vector: hr_min = @(mins) [fix(mins(:)/60) rem(min...

1 day ago | 0

Answered
How do separate plot into months?
Try something like this: t = datetime('now')+hours(0:8760); % Create Array d = randn(size(t)); ...

2 days ago | 0

Answered
Issues with loop- "Too many input arguments."
You are not calling it correctly! See if: fun= @(x) normpdf(x) [f]= NC_2(4,-3,0,fun) does what you want.

2 days ago | 0

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Answered
How do I plot an equation that requires I divide over a range?
There are (at least) two problems: First: r = 0.01:0.02; the default step for the colon,: operator is 1, so the range for...

2 days ago | 0

Answered
Plotting lissajous (phase figure) gives wrong results
Use a slightly different ode45 call, and then plot the columns of ‘y’ against each other: [t,y] = ode45(M,[0 100],[2 2]); f...

2 days ago | 0

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Answered
Plotting the tone frequencies
Note that ‘t’ seems to be missing. Substituting for it and changing the xlim parameters: t = values; figure ...

2 days ago | 0

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Answered
x(t) = -u(t-3)+2u(t+1)-2u(t-1)+u(t-3)
Straightforward: u = @(t) t>0; t = linspace(-5,5); x = @(t) -u(t-3)+2*u(t+1)-2*u(t-1)+u(t-3); figure plot(t, x(t)) grid...

2 days ago | 0

Answered
Enhancing an Audio file
Amplifying it is straightforward: [y,Fs] = audioread('Madam’s Comments on draft 3 of ppt (mp3cut.net)-2.mp3'); [yh,yl] = boun...

2 days ago | 0

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Answered
c2d function 'zoh' method formula
See the documentation section on Continuous-Discrete Conversion Methods That goes into a reasonably detailed explanation of all...

2 days ago | 0

Answered
how to read data from file into a char array?
If you want to read the file as text, use the fileread function. You can then do what you want with it.

2 days ago | 0

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