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Star Strider


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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)

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How to estimate parameters of fractional SIR epidemic model?
See for example Parameter Estimation for a System of Differential Equations You have to define your differential equation...

約2時間 前 | 0

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extract max and min frequency of a spectrum
There are some Signal Processing Toolbox functions that may do what you want. See for example the powerbw function. There ar...

約16時間 前 | 0

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Modern software should not do this, something annoying that can be improved
There are ways to deal with inequalities in datetime arrays. If you want to compare only the days (not considering the times), ...

1日 前 | 0

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I can't understand what my mistakes are
Using parentheses () to index into a table indexes the table itself rather than the elements of the table. To index the element...

3日 前 | 2

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Finding out the missing dates and times from the time series data
I am not certain what result you want. One option is to read it in as (or convert it to) a timetable and then use the retime ...

4日 前 | 0

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How change design of my graph to this shape by data analysis?
I am not certain what you are asking. Choosing a matching colormap is straightforward, and turbo seems to be close to that in...

5日 前 | 1

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Insufficient number of outputs from right hand side of equal sign to satisfy assignment. Error in extraction (line 32) [f0,idx] = pitch(x,fs,Method="SRH",WindowLength=win
The Audio Toolbox pitch function (that matches the syntax you quote) produces two outputs, and (other than a missing right paren...

6日 前 | 0

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Why the filter has no output?
You are designing a continuous filter. All the relevant functions (specifically the filter functions) in the Signal Processing ...

7日 前 | 0

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Using Matlab online, how do I set up a path to my computer (e.g. d:\)
I’m not certain what you’re asking. One possibiilitiy is: How can I upload files from computer to Matlab Online? .

8日 前 | 0

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What is the mathlab code for this figure?
It would help to have the function for . Lacking it, this still requires annotation objects, and that is not always straightf...

8日 前 | 0

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Get difference equation from continuous transfer function
One approach — 0.002174 s + 0.0001581 ---------------------------------------------------------- 6.2...

8日 前 | 1

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changing values in matrix from static output to dynamic output
I don’t know if this does what you want, however it has the virtue of not throwing the size mismatch error — cap=15; crit=3; ...

9日 前 | 0

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Daily mean through long time
T1 = readtable('data.xls') % Import Data DateTime = datetime([T1{:,1:5} zeros(size(T1,1)...

9日 前 | 1

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Combine multiple varying length double arrays into one timetable
First, convert the datenum values to datetime arrays using the ConvertFrom='datenum' name-value pair, either reading each of the...

10日 前 | 0

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Solving non linear system with fsolve
It seems that fsolve stopped when it converged. R = 1.0e-20 * [ 0.1251 -0.0001 -0.0000 -0.1019 -0.0008 -0.00...

11日 前 | 0

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Finding point of zeta line & rootlocus
I am not certain what you are starting with, so I cannot provide an exact response. However one approach may simply be to use i...

12日 前 | 0

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How to randomly select the datapoints in a vector based on percentage for each group?
I’m not certain iif you want to apportion them as they exist in the original vector, or if you want to apportion them by ascendi...

15日 前 | 0

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How to simplify output from solve
I can’t be certain that this is a significant improvement, however it is the best I can do with your data — % Define symbolic ...

17日 前 | 0

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How can i make optimization by using genetic algorithm to minimize error between desired and simulated force?
Your fitness function should be something like this: fitness = @(b) norm(dependent_variable - model_function(b,independent_var...

17日 前 | 0

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Parfor random numbers are not quite random
Sequences generated by computers are called ‘pseudorandom’ because they are just that. They are generated cyclically. See Mo...

17日 前 | 0

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How to save contourf data and not plot it for running efficiency?
Use gcf to return the figure handle, then set the visibility to 'off'. Example — [X,Y,Z] = peaks(50); figure [c,hc] = c...

17日 前 | 0

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The method of how to calculate the FWHM.
A different approach — x = linspace(0, 10); y = exp(-(x-5).^2*0.25); ymin = min(y) [ymax,idx] = max(y - ymin) halfmax ...

19日 前 | 0

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How can I disable the 'select a website' pop-up every time I open the MATLAB help documentation?
I believe this has recently been resolved. See this Answer.

20日 前 | 0

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generate a 3d scatter plot with z-support lines / pin plot / needle plot ...
See if the stem3 function will do what you want. You will probably still have to use a loop of you want the individual stems ...

20日 前 | 1

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How can I shade an interval in a calculus function with the area() function?
I prefer the patch function, simply because I have more experience with it. Try this — x = linspace(0, 1); y = 1 + 0.5*sin...

21日 前 | 0

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Problems with creating a data table
You probably do not have to do any of those data manipulations. Just read the file eand plot the results — T1 = readtable('...

24日 前 | 0

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morse code translator not outputting sound
When I ran your code with an appropriate argument, I got: Unrecognized function or variable 'morsecode2'. Beyond that, I juat...

25日 前 | 0

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How to plot an array of 4 columns?
I wrote this to solve a similar problem. The original problem was to create a surf plot to match a scatter plot. Try this — ...

25日 前 | 0

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I keep on getting the error conversion to double from table is not possibl
I am not certain that I understand what you are doing. It would probably help to upload the matrix (text or Excel file) to he...

25日 前 | 0

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How to use Wilcoxon signed-rank test and correct for multiple comparisons?
The signed-rank test is for paired studies (for example the same group before and after an intervention) and ranksum for unpaire...

25日 前 | 1

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