Star Strider

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14.683 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

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Answered
How to draw Cuboid of a specific dimension
See if Drawing 3d objects and filling the sides will do what you want.

alrededor de 6 horas ago | 0

Answered
plotting frequency response of data in matlab
There is only one column of data, that I assume are the independent variable. You cannot plot its frequency response without an...

alrededor de 23 horas ago | 1

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Answered
I converted double in CSV, but I need the comma at the end of each value
If it absolutely must have commas, it is straightforward to make it happy: x = rand(5,1); fprintf('%.4f,\n', x) producing (i...

1 día ago | 0

Answered
Error using fprintf Invalid file identifier. Use fopen to generate a valid file identifier. Function help
Try this: fprintf('E = %23.15E\n',E) Choose the format you want.

1 día ago | 0

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Dealing with large timetables
The only option I can suggest to you is in the timetable documentation section on Extended Capabilities under Tall Arrays. (I h...

1 día ago | 0

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Answered
sorting table according to date/time
There are problems with the 'InputFormat' format string. Try this: t=datetime(T1T2.TimeStamp,'InputFormat', 'MM/dd/yyyy hh:...

1 día ago | 0

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Answered
index exceeding array bounds
One option would be to test ‘j’ against the number of rows in the matrix-of-interest, something like this: for j = 1:length(ra...

1 día ago | 0

Answered
Mismatched delimiters relating to log() function?
You have a typo: D(:,:,i) = [Re.^theta(2,i) log(Re.)*theta(1,i)*(Re.^theta(2,i))]; ↑...

1 día ago | 0

Answered
Use fzero() to calculate x required to achieve V/F for every combination of V and F.
The fzero function is a root-finder, so the function it is given to solve must equate to 0 for any delection of independent vari...

1 día ago | 0

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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'...

1 día 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...

2 días ago | 1

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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?

2 días ago | 0

Answered
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))) ./ (((...

2 días ago | 0

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Answered
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...

2 días ago | 0

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Answered
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...

2 días 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...

2 días ago | 0

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Answered
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)’.

2 días 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...

2 días 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...

2 días ago | 1

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

3 días ago | 0

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

3 días 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)...

3 días 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...

3 días 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...

3 días 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(@...

3 días ago | 0

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

3 días 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 ...

3 días ago | 0

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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...

3 días 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; ...

4 días ago | 0

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

4 días ago | 0

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