# Star Strider

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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**Content Feed**

How to FFT my xlsx files from time domain to frequency domain?

Try this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1000730/delay%2040ms%20speed%20100%2...

alrededor de 7 horas ago | 0

Extend a cell array of dates (from days only, to hours and days) in a compact way

Try this — C1 = {'17-Jun-2017'; '30-Jul-2017'} DT1 = [datetime(C1{1}) : days(1) : datetime(C1{end})]' DT2 = [min(DT1): hou...

alrededor de 8 horas ago | 1

| accepted

How to plot matrix columns as if they where chronologically ordered

I am not certain what you want to do — x = linspace(0, 10, 166)'; M = [cos(2*pi*x/50) sin(2*pi*x*2/50) cos(2*pi*x*3/50)]; ...

alrededor de 9 horas ago | 0

How to plot confusing phase plane

The quiver and gradient functions will likely be helpful. Try this — syms e_p e_r epsilon=0.96; alpha1=0.25; alpha2=...

alrededor de 11 horas ago | 0

How to utilize 'symsum' in this case?

Try something like this — syms i j t Y Eq = symsum(Y,j,2,5) * (symsum(t,i,1,j)^2 - symsum(t,i,1,j-1)^2) .

alrededor de 21 horas ago | 0

I am trying to find the integral gain (ki) of the following transfer function.

Symbolic variables are not permitted in Control System Toolbox objects, however anonymous functions are. Try this — sys = @...

alrededor de 21 horas ago | 0

Scatterplot with two x and y axes only showing one dataset

The code only creates one tile: t = tiledlayout(1,1); Changing it to: t = tiledlayout(1,2); or: t = tiledlayout(2,1); a...

1 día ago | 0

How to solve third order equation using ode45

I let the Symbolic Math Toolbox do everything — syms y(t) T Y Dy = diff(y); D2y = diff(Dy); D3y = diff(D2y); Eq = D3y - D...

1 día ago | 1

| accepted

COnvert x,y, time array into 3D matrix

Try this — xyt = [1, 3, 2 1, 3, 2.3 1, 3, 2 1, 3, 2.1 1, 3, 2.4 4, 5, 1 4, 5, ...

1 día ago | 0

| accepted

how can I change the code to have only unique CDF and PDF plot?not for all samples

I am not absolutely certain what you want. If you want one plot for the first and last subplots, rather than multiple lines i...

1 día ago | 1

| accepted

Need explanation on plotting frequency response of a causal discrete-time LTI system implemented using the difference equation.

‘does it mean H=RH_coeff, w=LH_coeff?’ No. The first argument are the numerator coefficients of the filter transfer function...

1 día ago | 1

Obtaining value of highest order derivative over simulation period

One option would be to use the gradient function on the second column of the differential equation output (the integrated functi...

1 día ago | 0

bandpass filter design from low-pass iir filter

See if the lp2bp function will do what you want.

2 días ago | 0

How to make a table of strings from a table of numerics

I’m not certain what you want, however substituting compose for sprintf may be appropriate — arr = [1;2;3;4]; T = array2table...

2 días ago | 0

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3d surface plotting of spherical coordinates which i have in csv

Apparently, the angles sent to sph2cart were in degres, not radians. Try this with the complete file — M = [20 0 ...

2 días ago | 0

Help on ploting bar graph using table

There are mismatches between the number of names and the number of variables, and a missing comma between ‘Protein L’ and ‘Prote...

2 días ago | 0

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Modifying 3D plot

There are only two points, so I am not certain what you want for the others. One option could be to use stem3 instead — x =...

2 días ago | 0

removing pops/clicks from audio file

The filloutliers function (or one of its friends) could be an option — [y,Fs] = audioread('https://transfer.sh/fR2wht/vinyl.mp...

2 días ago | 0

| accepted

How do I add a range and shade the area between these two graphs?

I will leave the cdf calculations to you. However the shading is not straightforward because the cdfplot contains two Inf val...

2 días ago | 0

How to solve a system of differential equations using ode45 and vary the magnetic field and plot the solutions as a function of this field?

First, define ‘dRdt’ as: dRdt=@(t,R,B) then loop to substitute differeent values of ‘B’ and store the results. B=[0:0.1:10...

2 días ago | 0

Derivative of Bessel function at x=0.

One option is to use the limit function, however tha does not always produce a numeric result. I ususally cheat and use eps i...

2 días ago | 0

Comparison two curves (functions)

Use interp1 — x = linspace(1, 20, 30); y = tanh(x-12-rand)*2.5; x0 = interp1(y,x,0) figure plot(x,y, x0,0,'+r', 'Marke...

3 días ago | 0

How to average data per hour ?

Transpose it so that the columns are rows, create it as a timetable and then use the retime function specifying 'hourly','mean'....

3 días ago | 0

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How to integrate besselk function with variable limits?

One option is to use the arrayfun function to do the integration (essentially a one-line implied for loop) — % double x; y=0:...

4 días ago | 1

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fit a sine wave to a set of data points

The data in my original code (thank you for quoting it) expects more than one cycle, so it is (unfortunately) not robust to your...

4 días ago | 0

Printing a message inside a function

Use either: sprintf('%s has finished running',file1) or: fprintf('\n%s has finished running\n',file1) depending on the res...

4 días ago | 0

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How can I estimate transfer function from frequency data?

The best way to see how well the estimated system fits the data is to use the compare function. Change (increase) ‘np’ using...

4 días ago | 0

is it possible to multiply 2 symbolic polynomials?

The easiest way to find out is to do the experiment — syms x f=[34 43 5] %and h=[32 34 4] % i can use the (conv command...

5 días ago | 3

| accepted

copy and paste datas from two Arrays into one

At leasty two options for this — A = [3 4 6]; B = [5 7 9 11 14 17]; C = [A; B] C = cat(1,A,B) .

5 días ago | 0

How do i count the signal within a certain time interval?

One option is to use the movsum function, and then threshold the result — t = linspace(0, 100, 100); s = rand(100,1)>0.80; ...

5 días ago | 1

| accepted