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Solution of a system of ODEs by means of bvp4c
The singlular Jacobian was likely the result of the ‘(1/r)’ term, since ‘r’ initially begins at 0. While changing that removed ...

fast 4 Jahre vor | 0

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How to remove a certain value from all entries of a vector
You can remove the offset and the trend with a highpass (or bandpass) filter. (Use bandpass if you want to elimiinate high-freq...

fast 4 Jahre vor | 0

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Discrete input signal and continuous transfer function
It would likely be best to convert the continuous-time transfer function to a discrete-time transfer function (ideally using the...

fast 4 Jahre vor | 1

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Align two plots based on amplitude
Perhaps something like this — t = linspace(0, 10, 1000); y1 = sin(2*pi*t/2.5) + randn(size(t))*0.1; y2 = 1.5*sin(2*pi*t/2.5)...

fast 4 Jahre vor | 0

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Finding Unknown Parameters from Monod Equations
The estimated value for ‘theta(1)’ definitely does not appear to be as expected for a rate constant, however if it is than it ...

fast 4 Jahre vor | 0

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How do I implement a genetic algorithm for parameter fitting to an already existing ODE system>
Here is some prototype code I developed a while ago that you can adapt to your system — t=[0.1 0.2 0.4 0.6 0.8 1 1.5 2...

fast 4 Jahre vor | 0

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How to Hide Legend of Plot 2?
Perhaps — zeys = n; text = ['Run ',num2str(zeys)]; hp1 = plot(x,y,'DisplayName',text); hp2 = plot(xmax,y...

fast 4 Jahre vor | 0

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fminsearch for a function f(x,y) = x^4 -3xy+2y^2
It depends how you set up the function, and whether you use the function by itself or the norm of the function. The easiest w...

fast 4 Jahre vor | 0

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how to calculate the differentiation by diff command ?
The diff function to calcualte the derivative is part of the Symbolic Math Toolbox. To calculate a numerical derivative, use ...

fast 4 Jahre vor | 0

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what is the argument I'm missing here? How to fix it?
This call: H_MMSE(: , r ) = MMSEesti(ReceivedPilots(: , r ) ,TransmittedPilots(: , r ), N, pilotFrequency, H_A2(1 ,1:2), SNR);...

fast 4 Jahre vor | 0

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2d surface or contour plot of three independent variables
The data are gridded. It is simply necessary to reshape them to plot them — sweep = readtable('https://www.mathworks.com/matl...

fast 4 Jahre vor | 0

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Is there a way to store execution times on a disk?
Perhaps tic and toc — s(1) = 0; t0 = tic; for k = 2:10 s(k) = s(k-1) + 1; t_int(k) = toc(t0); end Result = [s; t...

fast 4 Jahre vor | 0

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Interpolate rows of an image/matrix
Guessing — EvenRows = randn(5, 10); Matrix = NaN(10); Matrix(2:2:end,:) = EvenRows MatrixInterp = fillmissing(Matrix,'linea...

fast 4 Jahre vor | 0

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How do you make a label for a point on a plot separate into multiple lines?
Use sprintf instead — ii = 1; indMaxAmp(ii) = 24; maxAmp(ii) = 42; txt = sprintf('f = %.3f Hz\nP1 = %.3f dB', indMaxAmp(ii)...

fast 4 Jahre vor | 1

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contourf lower edge effects, how to fix and how does contourf work
We’re missing the filter function you’re using, so not able to run your code. However the pspectrum 'spectrogram' plot demonstr...

fast 4 Jahre vor | 1

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fft(x), why divide with L?
The Fourier transform uses repeated summations of the original vector to create the transform vector. Dividing my the length of...

fast 4 Jahre vor | 0

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How can I get my distance variable to be [0.1:0.7] to show as [0.1,0.2,0.3,0.4,0.5,0.6,0.7]
The default ‘step’ using the colon operator is 1, so the condition is immediately satisfied and only the first element appears. ...

fast 4 Jahre vor | 0

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Can MatLab help this beginner with a chemistry problem about acid-base titrations
I was in the process of posting a response to the yesterday when my computer sbruptly crashed (in the wake of the Win 11 2022 2 ...

fast 4 Jahre vor | 0

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Help with 3D contours aligned to discrete surface data
Reading the files is not an option, so I went straight for the ‘Problem.fig’ file. I’m not certain that the contour lines ar...

fast 4 Jahre vor | 0

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How to display a particular range of log value at x-axis?
I am not certain what you want the result to be. Perhaps using xlim would work (regardless of the axis scaling, however it ma...

fast 4 Jahre vor | 0

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How to use a Fir1 filter to make a lowpass filter
The filter specification needs to be: blo = fir1(128,0.48,chebwin(129,30)); because of the filter length.. That will work. ...

fast 4 Jahre vor | 0

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Help with contours at maximum z-level in surfc
I asked about this a while ago, and received a repl;y from MathWorks that I sent along to Yair Altman for inclusion in Undocumen...

fast 4 Jahre vor | 0

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Help with choice of contour intervals in surfc
The second object in surfc is the countour plot, so address it and set the 'LevelList' property — [X,Y,Z] = peaks(50); figu...

fast 4 Jahre vor | 0

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How do I get a maximum and minimum for a singular wave while ignoring the other local maximums and minimums?
Using my code in How can I create isolated waves from data I have? — LvPks = islocalmax(y, 'MinProminence',0.01, 'MinSeparatio...

fast 4 Jahre vor | 0

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Kinetic Models (Monod Equations)
See: Monod kinetics and curve fitting A somewhat improved version of that is in: Parameter Estimation for a System of Differe...

fast 4 Jahre vor | 0

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printing matrix data in the correct order (fprintf)
data_info = [2020 3 21 12 0 2020 3 21 12 10 2020 3 21 12 20 2020 3 21 1...

fast 4 Jahre vor | 1

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Why isn't my max iterations increasing?
Always tell the functions that there is an options structure available — answer1 = fsolve(fun, x0, options) They do not infer...

fast 4 Jahre vor | 1

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How can I create isolated waves from data I have?
The most robust way I am aware of to detect zero-crossings is: zci = find(diff(sign(y))) where ‘y’ is the signal youwant to a...

fast 4 Jahre vor | 0

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How do I download the signal processing package into my MATLAB R2022a?
This has changed over time. In MATLAB, click on Add-Ons and then click on View My Products. That should offer you the opportun...

fast 4 Jahre vor | 1

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How to convert YYYYDDMMhhmm into 5 columns of YYYY, DD, MM, hh, mm?
One approach — A = [202021031200; 202021031210]; As = string(A) ADT = datetime(As, 'InputFormat',"yyyyddMMHHmm") ADTM = [...

fast 4 Jahre vor | 0