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Star Strider


12,767 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
Average of Wave from 10 waves in single graph
Try this: D = load('P_191005_000.mat'); ap = D.b; Ts = 1E-3; ...

8 hours ago | 2

| accepted

Answered
How to take Average of many waves to single wave(want he averge of all waves to a single wave)
Used the islocalmin function to find the minima of the waveform, then use those indices to store the wave segments in a cell arr...

9 hours ago | 1

| accepted

Answered
give labels according to string
Try this: String = {'Abc\a1\L\XYZ1R08' 'Abc\a1\R\XYZ1R09' 'Abc\a1\R\XYZ1R10' 'Abc\b2\L\XYZ2L01' 'Abc\b2\R\XYZ2L02' 'A...

9 hours ago | 1

| accepted

Answered
Help, How to convert image to binary image ?
See if im2bw (R2015b and earlier) or imbinarize (R2016a and alter) will do what you want.

10 hours ago | 0

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Answered
find transfer function of input and output signals and then perform an FFT.
This should get you started: [D,S] = xlsread('Test_data_1.xlsx'); torg = D(:,1); ...

11 hours ago | 1

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Answered
Extract and code gender string as number using if loop
I do not udnerstand the reason strcmp or strncmp would not work with your structure data. We may have to see ‘tempfile.data.gen...

12 hours ago | 0

Answered
Interpolation of scattered earthquake data
There are several options. First, see if the griddata function will do what you want. (The Mapping Toolbox may have more appli...

23 hours ago | 0

Answered
SUM OF (-1^K)/FACTORIAL(K+1)
First, use element-wise operations: k = 1:6; v = (-1).^k./factorial(k+1) sv = sum(v) See Array vs. Matrix Operations for a ...

1 day ago | 0

Answered
The magnitude in Bode plot differs from the mag values returned with: [mag,phase,wout] = bode(G,win)
The output magnitudes are not in decibels. If you instead use: mag_dB = 20*log10(mag) the result is: mag_dB = 27.7802...

1 day ago | 0

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Answered
Format colorbar using engineering notation
Try this: engstr = @(x) [x(:).*10.^(-3*floor(log10(abs(x(:)))/3)) 3*floor(log10(abs(x(:)))/3)]; Q1 = logspace(-3, 3, 7); ...

1 day ago | 0

| accepted

Answered
Failure in initial objective function evaluation. FMINUNC cannot continue.
Unless it is already in a function file, it needs to be an anonymous function: f = @(x) x(2)^2*x(9)^2 + x(2)^2*x(9) + x(2)^3*x...

1 day ago | 1

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Answered
Read several large csv and store as separate variables
Perhaps saving it in a cell array would work: file{i}=readmatrix(filename); Note the curly brackets {} denoting cell-array i...

2 days ago | 0

Answered
How to quickly find the maximum group of same rows in a matrix?
Try this: A = [0 1 0 1 0 0 0 0; 1 0 0 0 1 0 0 0; 1 0 0 0 ...

2 days ago | 0

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Answered
Display Markers At Specific Data Points
The MarkerIndices name-value pair is relatively new. If you do not have it, it is straightforward to do that with a second plo...

2 days ago | 1

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Answered
Units for Magnitude after Fast Fourier Transform (FFT) is done
The magnitude units are the same as the time-domain amplitude units, unless you transform them in some way (such as squaring to ...

2 days ago | 0

Answered
How to fill a vector with just 2 elements -1 and 1, as a pseudorandom sequence?
Try this: N = 10; xpnt = randi(2, 1, N); X = (-1).^xpnt; producing (in this run): X = -1 1 1 1 -1 ...

3 days ago | 1

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Answered
design filter , Hello everyone, I'm trying to run a script I've written that deals with signal modulation and frequency filtering. unfortunately, the software is crashing at runtime while its deal with the "bode", what can i do?
The bode function is part of the Control System Toolbox (and friends). It takes a system object as an argument. Also, multiply...

3 days ago | 0

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Answered
How to rearrange the output variables for matlabFunction()?
I can’t run the code you posted, since it generates significant errors about matrix size multiplication. However, a simple ex...

3 days ago | 1

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Answered
solve an equation using solve() produces an array instead of a unique value
The result is correct. There are three roots. Plot it to see the result: syms h d = 32*h + 200*(32*h - 8)*((4*h - 1)^2 -...

3 days ago | 0

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Answered
Error while solving a coupled system of ODE
Your ‘DM_bacteria’ function must return a column vector output. This worked when I ran it just now: function [dxdt] = DM_ba...

3 days ago | 1

Answered
Array indices must be positive integers or logical values
The problem: for k=0:M-1 The solution: for k=1:M In MATLAB, subscript indices begin at 1, not 0, and are defined as intege...

3 days ago | 0

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Answered
Wrong answer for sine function
Define ‘t’ in terms of days (or fractions of days). Try this: rforce = @(t) 0.3 + 0.2.*sin(2.*pi.*t/365 - pi/2); tdays =...

3 days ago | 1

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Answered
Working With Matlab Tables
I created my own table to test my code. (I didn’t post it previously because the other two Answers had already appeared.) Th...

3 days ago | 0

Answered
Ploting two different vectors in the same figure
Use element-wise multiplication, then transpose ‘a’ and ‘b’ to use the references in your plot3 calls. Alos, specifically use t...

3 days ago | 0

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Answered
plot with a few sample marked.
Try these: x= 1:0.01:40; y = cos(x); L1 = y <= 0.5; % Logical Index: y <= 0.5 figure pl...

3 days ago | 0

Answered
how can i save struct in file txt?
Use the save function to save it as a .mat file.

3 days ago | 1

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Answered
Circle centers plot aren't in the same place as the circles in a figure
I cannot run your code. However, since ‘centersStrong’ is a two-column matrix of the x and y coordinates, your plot call woul...

4 days ago | 0

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Answered
The question about DC component!
Removing the DC component is useful in showing the other peaks in the Fourier transform of your signal, if there is a very high ...

4 days ago | 0

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Answered
fprintf conversion character use \c or \s?
Putting character arrays and numeric variable types together in a matrix is not appropriate. Try this instead: countries = ...

4 days ago | 0

Answered
Error when solving an equation involving a poisson pdf
Try this (instead of using the Symbolic Math Toolbox): lambda = fzero(@(lambda) poisspdf(10, lambda) - 0.1, 5) producing: l...

4 days ago | 0

| accepted

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