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# Star Strider

##### Last seen: Today
14,675 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
How do I fix my legend?
For every plot call, return a handle: h1 = plot(a1,b1,'ko','LineWidth',3); . . . h2 = plot(c1,d1,'bo','LineWidth'...

2 hours ago | 0

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Answered
Extract hourly data from minute data over a year
Try this: T1 = readtable('weather_data_2019.txt'); Idx = minute(T1.Datetime) == 0; OutTable = T1(Idx,:) producing (for this...

5 hours ago | 1

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Answered
How can you make an input to a symbolic variable?
Try this: varprompt='Enter Variable (space-separated):'; var=inputdlg(varprompt) v = regexp(var, ',', 'split') syms(v{:}) ...

5 hours ago | 0

Answered
How to plot both real and imaginary part of complex exponential?
See my Answer to your duplicate Question: How to plot both real and imaginary part of complex exponential?

6 hours ago | 0

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Numerical integration in MATLAB
Try this: c = @(T) (h.^2 .* D) ./ (2 .* pi * pi * vs * kb .* T .* T); fun = @(x,T) ((x.^4 .* exp((h.*x) ./ (kb .* T))) ./ (((...

7 hours ago | 0

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Interpolate NaN on graph
If the data have NaN as the value of the dependent variable, and the independent variable is continuous (with no NaN values), th...

8 hours ago | 0

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Finding all the zeroes of a discontinuous function in a particular range
It may be version-dependent. In R2020b (Update 1), I get: extrema = 13.3333 -1.0 ans = -26.666666666666666666666...

8 hours ago | 0

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Answered
EMG bandpass filter to remove 50 Hz power line
With a sampling frequency of 10 Hz, the highest frequency that can be uniquely represented is 5 Hz, which is much too low for an...

9 hours ago | 0

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error in my code
The way you coded ‘R’: R=1000*[5, 100, 200, 250]; it only has 4 elements. Nothing exists beyond ‘R(4)’.

10 hours ago | 1

Answered
Finding Best Fit for Log Scaled Graphs
It is best to fit the power function using a nonlinear approach: x = [0, 0.00027036151034654, 0.00115093883458806, 0.002234322...

11 hours ago | 0

Answered
How to plot both real and imaginary part of complex exponential?
For best results, replace ‘j’ with ‘1j’, then convert the result to double to use plot (since fplot is likely to be more difficu...

13 hours ago | 1

Answered
Changing the legend color
Try something like this: y = linspace(0,50,50); % Create Data v = 1:14; ...

1 day ago | 0

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plotting concentric circles using contour
Use the axis function, specifically either: axis('equal') % Function Expression or: axis equal ...

1 day ago | 0

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Answered
Graph help in matlab
This is not your function, however it illustrates the ‘logical indexing’ approach to such problems: f = @(x) (2-2*x).*(x <= 0)...

1 day ago | 0

Answered
Pseudo Element by Element Vector Subtraction
See if this does what you want: C1 = A(:,1).' - B(:,1); % Col #1 In ‘A’ - Col #1 I...

1 day ago | 0

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Answered
Numbers in command window printed 10000 times smaller
I suspect there is an exponent indication out-of-view in the image you posted. When I read and reshape your file as in your p...

1 day ago | 0

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Answered
How to write Pearcey functions?
I would code them as: Pe1 = @(x) integral(@(s) exp(1i*(s.^4 + s.^2.*x)), -Inf, Inf, 'ArrayValued',1); Pe2 = @(x,y) integral(@...

1 day ago | 0

Answered
Is there any ways to find all elements' rows and cols number at once?
Meet the size function!

1 day ago | 0

Answered
Separate a time signal for each frequency
The pspectrum function (introduced in R2017b) with the 'spectrogram' type may be what you want. It produces a spectrogram plot ...

1 day ago | 0

Answered
Error when using fminsearch to find least squares fit of data using a given equation
I can’t figure out from your code what your independent and dependent variables are. As a general rule, the argument to fmins...

1 day ago | 0

Answered
How do I convert a transfer function of a low pass filter to bandpass?
If you want to use the Signal Processing Toolbox functions, this works: syms s; N=4; for k=1:N w=((2*k+N-1)/(2*N))*pi; ...

2 days ago | 0

Answered
Designing a bandpass filter
See if the bandpass fucntion works for you.

2 days ago | 0

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Answered
How to select every second number from a file of numbers separated by a comma
I looked at ‘UE1.txt’ and I initially could not make any sense out of it. It’s apparently supposed to be a multi-channel record...

2 days ago | 0

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Answered
plotting a graph with different conditions using if statement
Your code can be made significantly more efficient by using vectorisation and ‘logical indesing’: mu_a1 = 0.1; %absorption coe...

2 days ago | 1

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Answered
Deleting Some initials of The Matrix
It depends on the functions you have available. It appears to be a text file, so one option would be textscan: fidi = fopen('...

3 days ago | 0

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Answered
Requesting help for piecewise ploting
The Symbolic Math Toolbox and here particularly the piecewise funciton may not be the best option for this problem. Use ordin...

3 days ago | 0

Answered
Need Help New to MATLAB
To make them not be fractions, use vpasolve or vpa on the result: F2s = vpasolve(Fwy+F1y+F2y == 0,F2) F1s = vpasolve(Fwx+F1x+...

3 days ago | 0

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Answered
Matlab returns empty symbol when solving laplace transform
Try this: syms s t C1 C2 R1 R2 i(t) I(s) eqn(t) = 0 == R1*i(t) + R2*i(t) + diff(i(t), t)/10 + int(i(t), t)/C1 + int(i(t), t)/...

3 days ago | 0

Answered
Ploting an anonymous function
It appears that ‘Cw’ also needs to be an anonymous funciton, however it is absolutely not obvious what variable it supposed to b...

3 days ago | 0

Answered
Need the function or Equation that solve this kind of questions?
This is not your function, however it illustrates the ‘logical indexing’ approach: f = @(x) (2-2*x).*(x <= 0) + (2+2*x).*(x>0)...

3 days ago | 0

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