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Star Strider


Last seen: Today
15,140 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
Help finding intersecting points
Try this: W = 73000; %Airplane weight in lbs Alt = 30000; %altitude given at 30000 feet S = 950; %Area of the wing given in ...

1 hour ago | 1

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Answered
how to remove/reduce power line noise from a short signal?
‘... the sampling rate I have is 19200 Hz but the data is cut in epochs of 480 samples(non continous) and as such makes the freq...

3 hours ago | 0

Answered
Locating global max in 3D plot
Try this: [maxval,Idx] = max(Pmusic(:)); [PmusicmaxRow,PmusicmaxCol] = ind2sub(size(Pmusic), Idx); I obviously cannot test t...

3 hours ago | 0

Answered
Optimization of system ODE
See the documentation section on Optimizing a Simulation or Ordinary Differential Equation

7 hours ago | 0

Answered
Filter Z Transform Implementation
The easiest way is to let the Control System Toolbox do the initial analysis: z = tf('z'); ...

7 hours ago | 0

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Answered
'fix' function misbehaving
Temporarily set the format to long, and then also do: dZ = Z - 955 and check the result. This is most likely the result of r...

1 day ago | 1

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Answered
What does the space on the resultant graph mean?
The space means that there are no data between the default grid limits that MATLAB chooses and the end of your data in the ‘spac...

1 day ago | 0

Answered
Finding the position of specific value in a vector without knowing the exact number
The find documentation section Last Several Nonzero Elements will let you return the indices of only some of the elements. You ...

1 day ago | 0

Answered
Plotting multiple Magnitudes in one plot
Put the figure call before the loop, and remove the subplot call: figure hold on for i= 1:1:23 [u,o] = butter(1,[2*100/...

1 day ago | 0

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Answered
Low pass filter VS high pass filter
Calculate the Fourier transform of the filter from the signals. t = ...; %...

1 day ago | 0

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Answered
How to plot 2D graph
If I understand correctly what you want to do, this should work: for t=1:20 for x=1:20 Sum=0; for n=1:1...

2 days ago | 1

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Answered
All fixed points of function
If by ‘fixed points’ you intend ‘roots’, try this: f = @(x) cos(x) - 0.07 * x.^2; tv = linspace(-10, 10); fv = f(tv); zvi...

2 days ago | 0

Answered
Interp2/Scatterinterp unstructured Data don't work!
Use the griddata function instead. Try this: Xm = load('X.mat'); X = Xm.Mecanical_Speed; Ym = load('Y.mat'); Y = Ym.Torq...

2 days ago | 0

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Answered
How to write name inside polygon?
Use the text function. Try this: pgon = polyshape([1 3 5 7],[2 6 4 1]); [xc,yc] = centroid(pgon); figure plot(pgon) a...

2 days ago | 1

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Answered
How to fit a CDF function on a dataset?
Try this: X = [0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8]; Y = [0 0.005 0....

2 days ago | 0

Answered
How do I fix this code? It says "Conversion to function_handle is not possible" on the line f(×) = (x^4) - (10*x^3) + 5
First, fix the typographical errors. Remember that MATLAB is case-sensitive. Second, see the documentation section on Anonymo...

2 days ago | 0

Answered
Filtering high frequencies from response signal
Try this: D1 = load('7004x4.mat'); T1 = D1.g; Q1 = T1(1:5,:); t = T1{:,1}; sm = T1{:,3}; t = rmmissing(t); sm = rmmiss...

2 days ago | 0

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Answered
NPN Bipolar Transistor Characteristics
Run this from a script or your Command Window: doc 'NPN Bipolar Transistor Characteristics' That should bring up the example ...

2 days ago | 0

Answered
Removing jumps from data when plotting a graph
I am not certain what result you want. Try this: D1 = readmatrix('SensorValues.xlsx'); s = D1; ...

2 days ago | 0

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Answered
Please, How do I determine the Mean Absolute Value (MAV) of an acoustic signal, which has positive and negative data points?
The mean value is the ‘average’ value. In almost all audio signals, the mean value is either 0 or close to 0. An electrocar...

3 days ago | 1

Answered
xlswrite is not recommended, what should I use instead?
Since you have R2020a, first, create a table using your data, then use writetable to write it to an Excel file (or other options...

4 days ago | 1

Answered
Hello everyone, how to divide a piece of data into upper and lower parts along the y-axis with C point and D point as the boundary?
Try this: D = load('data1.mat'); data1 = D.data1; x = data1(:, 1); y = data1(:, 2); [C,ixmin] = min(x); [D,ixmax] = max...

4 days ago | 1

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Answered
Hodgkin-Huxley Error Code: Index exceeds the number of array elements (1)
Your differential equation returns a column vector of 4 elements, so it is necessary for the initial conditions vector and whate...

4 days ago | 0

Answered
contourf plot gives white bands
Without your data, it is not possible to determine with any certainty what the problem is. Two observations: First, [X,...

4 days ago | 0

Answered
Value of x for which AUC reaches a given value
‘I calculate the AUC using the trapz function.’ That being the problem. Use cumtrapz instead: t = linspace(0, 1, 500); ...

4 days ago | 1

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Answered
How can I solve this equation in which variable is in power
One option is to use GlobalSearch: y = [2.1544; 1.71; 1.99; 1.59]; rhs = @(a,b,c,d) [a*(5.95.^b) + c.*(5.95.^d); a.*(6.72.^b)...

4 days ago | 1

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Answered
running MATLAB ode45 back-to-back
‘The first state solution that is returned, is it the same as the initial condition?’ In my experience, yes. Sometimes it is...

4 days ago | 1

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Answered
How to flip the data upside down without flipping the axes?
I am not certain what result you want. Try this: x = [1 2 3]; y = [6 13 11]; figure plot(x,max(y)-y+min(y)) .

4 days ago | 0

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Answered
Plot contour with 3 variables
The contour function requires matrices. You will need to create the matrices from your vectors. Try this (with your actual d...

4 days ago | 1

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Answered
how to apply bandpass filter to a .wav file
Use the bandpass function. For best results, also specify: 'ImpulseResponse','iir'

4 days ago | 0

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