Star Strider
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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Content Feed
the for loop is only giving me the last value
There are likely a lot of zeros in the vectors because of the way ‘i’ is defined. The loop is likely not necessary anyway. ...
alrededor de 9 horas ago | 0
How to fit data to a function form
Yes! The mldivide,\ funciton will do this. x = randn(10,1); y = randn(10,1); z = randn(10,1); w = randn(10,1); DM = ...
alrededor de 9 horas ago | 0
Is it possible to rectify the figure such that the zig-zag effect doesn't occur?
Using one of the sort functions to sort on the independent variable could work. Remember to sort both variables by the same sor...
alrededor de 14 horas ago | 0
Transfer Functions and Pole Zero forms
The Control System Toolbox tf and zpk functions could be helpful.
alrededor de 16 horas ago | 0
How do I crop a matrix in MATLAB based on contents of one column?
I am not certain what the matrix is, or whether there are other missing entries in the matrix. If only the 5th column has missi...
alrededor de 18 horas ago | 0
| accepted
how to plot graph for SIR epidemic model
I beleive ‘sir’ is supposed to be a system of ordinary differential equations. If so, this will get you started — tspan...
alrededor de 19 horas ago | 0
how to fit ylabel for the plots?
One possibility — left_offset = 0.01; set(ylh, 'Rotation',0, 'Position',ylp+[left_offset 0],'VerticalAlignment','middle', 'Ho...
alrededor de 22 horas ago | 0
extrapolate data to cross x axis
There are 19 variables in that .mat file. I have no idea which ones are to be extrapolated, so I took a wild guess on two of th...
alrededor de 23 horas ago | 0
| accepted
finding matrix base on linear equation
I’m not certain what the desired result is here. Try this — x = linspace(-10, 10, 5); y = -0.15*x-21.3; X = [x(:), ones...
alrededor de 24 horas ago | 0
Can I eliminate roundoff error caused due to floating point arithmetic limit in MATLAB?
Floating-point approximation error is simply inherent in binary representations of floating-point numbers. The best way to deal...
1 día ago | 0
What can I use instead of 'lsqcurvefit'
The ga function in the Global Optimization Toolbox does not use gradient descent and is therefore more resistant to getting hung...
1 día ago | 0
Trying to find an x value from a certain y value on my graph
I will re-post my original Answer because I believe it addresses the problem (although without the data, it is difficult to dete...
2 días ago | 0
Laplace transform not getting Value
I do not see any specific problems. syms x(t) Xs s eqn = diff(x,t,2)+2*diff(x,t)+26*x(t) == 10*cos(t)*(heaviside(t-pi)); ...
3 días ago | 0
| accepted
For machine learning classification between two samples, how can I focus on certain frequency components as the separating feature?
There may be many approaches to this. I actually did something similar using linear discriminant analysis (the Statistics and M...
3 días ago | 0
How can i create a discrete system with defined delays zeros and pole?
If you are starting with the pole and zero locations, you can get the transfer function representation easily by using the zpk f...
3 días ago | 0
| accepted
Plot 3rd differential equation
The documentation section on dsolve and Solve Differential Equation describes it better than I can! (It will be necessary to ...
3 días ago | 0
How to draw line between point and plotted line?
The two plots are different, so using the provided data (and the same Wikipedia article Distance from a point to a line) provide...
3 días ago | 0
In Scatter plot, make the largest data on the top
Since the data are being plotted with scatter3, experiment with the view function to rotate the 3D figure to display it as desir...
4 días ago | 0
Plotting bode diagram with a transfer function without values
No. How would you plot it without assigning values to any of the varaibles? (It would be possible to symblically derive some...
4 días ago | 0
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Control systems failing to plot
The only thing I can think of is to try these: restoredefaultpath % savepath % <— MAY NOT BE NECESSARY rehas...
5 días ago | 0
How can I define a symbolic function with vector arguments?
A vector has only one dimension (that I am aware of), so I assume ‘x’ needs to be a (3x1) vector. syms x ...
6 días ago | 0
Solve function has no numerical answer
Try this — lambda0=1.3e-6; L=1500e-6; syms x real A=6.2*10^(-22); B=6*10^(-18); C=lambda0/(2*L); eq=x==((C-A*x)/B)^1.2...
6 días ago | 0
| accepted
estimate transfer function from power spectrum density
I would not use the PSD for this, since the Fourier transform (fft or pspectrum) are better. If the System Identification Too...
6 días ago | 0
how to get tf answer for this problem?
Almost. Use the zpk function to do the format transformation. a=[40]; b=[0.05 1]; c=[1]; d=[0.5 1]; e=[0.8]; f=[1 1...
7 días ago | 1
| accepted
ode45 inside calling funciton error
All the arguments the function needs must be passed to it as additional parameters. See the documentation section on Passing ...
7 días ago | 0
Copy the text from the command window automatically
The diary function is an option, however if the code is printing to the Command Window, it would likely be easier to print it to...
7 días ago | 0
| accepted
How to generate line from data to the origin point in 3d scatter plots?
Try this — x1 = randn(10,1); % Column Vectors y1 = randn(size(x1)); z1 = randn(size(x1...
7 días ago | 1
| accepted
plot in logarithmic scale
The contourf function plots a plane, not a surface. To plot logarithmic contours of the ‘Z’ matrix, it will be necessary to c...
7 días ago | 0
| accepted
How to plot an equation with different parameter value?
Try this — x = 0:0.01:+10; c = [1;1.1;1.4;0.3]; Y = (1-x.^2).^c; figure plot(x,Y) legend(compose('c = %.1f',c), 'Locati...
7 días ago | 1
| accepted
How do you plot RMS of a Colormap?
Depending on the desired result, either use the rms function with the entire matrix (using the (:) convention to force it to be ...
8 días ago | 0
