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Star Strider


12.437 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
Optimizing parameters in ODE
This is a simple, separable differential equation that you can likely solve by hand. Using the Symbolic Math Toolbox: syms ...

circa 19 ore ago | 0

Answered
add label to a contour when when multiples plots
They appear to be plotted on the same set of coordinate matrices. One option is to use different line colours (and other variat...

circa 21 ore ago | 0

Answered
How to use format spec to read in Textscan?
I doubt you can insert the ‘e’ as part of the data. One option: x = sscanf('-2.554-4','%f') y = x(1).*10^x(2) producing: ...

circa 21 ore ago | 0

| accepted

Answered
I'm not getting table
It works when I run it, and with: q = which('table.txt', '-all') type(q{:}) produces: t x(1) x(2) ----...

circa 22 ore ago | 0

Answered
Put title for each subplot
Remove the single quotes: title (Titleindex(i)); and spell the name correctly in both the variable and references to it!

circa 22 ore ago | 1

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Answered
str2num not working on array
It returns an empty array because you apparently ask for a character array (for example ‘Red’) as the first input. That is not ...

circa 23 ore ago | 0

Answered
Difference between two plots of this final output figure??
The system being modeled Simulate Response to Square Wave is a 1-input, 2=output (SIMO) system, presenting the same input to bot...

1 giorno ago | 1

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Answered
Related to calculate average within particular range of graph
Use the negative of your signal (essentially flipping it upside-down) so the sharp dips are now peaks. Then use either findpeak...

1 giorno ago | 0

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Answered
problem in taking the step response of a function
Your ‘ matrix’ is actually a scalar: -0.022, that will evaluate to in your state space realisation. This produces a typical de...

1 giorno ago | 0

Answered
How to solve a differential equation using data from experiment?
Since you are not integrating the differential equation, this is a simple nonilinear parameter estimation problem. Try this: ...

2 giorni ago | 0

Answered
How a solution depends on a variable
One approach: gammav = linspace(0.5, 1, 10); for k = 1:numel(gammav) UE{k} = Explicit(S,sigma,r,T,M,K,gammav(k),N); end...

2 giorni ago | 0

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Answered
Normalize by using zero mean and unit variance
If you have R2018a or later, use the normalize function. Another option is zscore.

2 giorni ago | 1

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Answered
I have data points for different x and y points in excel and am trying to create a 3D contour plot of this data
I have absolutely no idea what you want. Try this: D = xlsread('excel for aerolab3.xlsx'); y1 = D(2:12, 2:end); y2 = D(16...

2 giorni ago | 0

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Answered
Shifting Baselines of Raman Spectra
This is an interesting problem! It took me a while to figure out the correct approach, however it is deceptively simple, and ...

3 giorni ago | 0

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Answered
Creating a vector out of variables
Use the format function to change the way they are displayed: A = 1/(10^(-6)); B = 22^(1/4); C = 4^(3+2); format long E ...

3 giorni ago | 0

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Answered
Remove NaN inside a loop cycle
Try this: B(i,:) = X(i,~isnan(X(i,:)));

3 giorni ago | 0

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Answered
How to upsample an RF signal by a non-integer factor.
The resample function allows ‘p’ and ‘q’ to be any integers, so even an irrational number for the sampling rate. x = randn(1,...

3 giorni ago | 0

Answered
ODE45 wont run, just says "error"?
You have two problems: First, your system has two differential equations, so you must have two initial conditions: ic = [0 1...

3 giorni ago | 0

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Answered
Plot for specific vibrational heat
Use element-wise operations: C_vv=((R*theta_v^2*(exp(theta_v./T)))./(((exp(theta_v./T))-1).^2.*T.^2)); ...

3 giorni ago | 0

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Answered
Optimisation of a filter knowing input and output
The System identification Toolbox is dedicated to problems like this. See if the Signal Processing Toolbox invfreqz function ...

4 giorni ago | 0

Answered
Why will these plots not plot on the same graph?
Each plot erases the plot before it. To overcome that, use the hold function: subplot(4,4,i) plot(spdnpwr(1:Astop,x)...

4 giorni ago | 0

Answered
Add additional name into a matrix
Use the cat function.

4 giorni ago | 0

Answered
Find two ways to create a 3 x 5 matrix with all values equal to 100 (Hint: use ones and zeros).
It is referring you to the ones function and the zeros function. Please look them up in the documentation.

4 giorni ago | 0

Answered
How can I separate the two fprintf
Add a ‘\n’ newline character to the end of each line: fprintf('A new location was found.Enter an ID for it:''NE051\n'); ...

4 giorni ago | 0

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Answered
How can I add a matrix into another matrix
If you want to insert ‘B’ somewhere other than as the first or last row of ‘A’: A = rand(16,5); B = rand(1, 5); newA = zeros...

4 giorni ago | 0

Answered
My Matlab filterDesigner is exhibiting errors when typed on the command line
In your Command Window or a script, type: ver to verify that you have the Signal Processing Toolbox installed. If you do, ...

4 giorni ago | 0

Answered
Velocity cumtrapz or gradient
The gradient function calculates the approximate numerical derivative of a vector, and the cumtrapz function calculates the appr...

4 giorni ago | 1

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Answered
How to do a nonlinear fit using least squares
This is actually a linear problem, so a linear approximation will estimate the parameters correctly: R = 8.314462; ...

5 giorni ago | 1

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Answered
Finding matrix values associated with plot point
One approach: A = rand(10,2); A(4,:) = [75 0.995]; Lrow = ismembertol(A, [75 0.995], 0.01, 'ByRows',1) RowNr = find(Lrow)...

5 giorni ago | 0

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