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Bjorn Gustavsson


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UIT, the Arctic University of Norway

396 total contributions since 2015

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Answered
Transposing matrices of a Dataset
Take a look at the help and documentation of the matlab-function permute. HTH

alrededor de 5 horas ago | 0

Answered
Inversion of block tridiagonal matrices
If you have a small enough problem which is not ill-conditioned just use \, if it is ill-conditioned but you can do an SVD of yo...

alrededor de 9 horas ago | 0

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Answered
Matlab is installed in ubuntu but i am unable to open it
If you try to execute something like ./matlab from your terminal you tell the shell to run an executable command "matlab" in the...

alrededor de 10 horas ago | 1

Answered
How to find peaks of the given signal and find the phase shift with respect to the Oscillator 1 signal?
If you had regularly sampled data (it doesn't seem so) this would best be done with spectrogram. That would give you the spectro...

4 días ago | 0

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How to solve the reduced eigenvalue poblem
Have a look at the eig function. It solves for eigenvalues-eigenvectors - also for the generalized eigenvalue-problem you seem t...

4 días ago | 0

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Plot signal from fits file?
To read data in fits-format you can use fitsread and fitsinfo, but when I try that on an image from SETI-projects web-site I got...

5 días ago | 0

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How to make a plot with x-axis that has different scales on different specific regions?
Either you can use something like set(gca,'xscale','log') if that brings you close enough. If you want to plot on some other ...

6 días ago | 1

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Answered
Avoid ''Dot indexing is not supported for variables of this type.'', exist(...) isn't working
If you want to check if a struct has a field your're interested in you should check with isfield, check the help and documentati...

6 días ago | 0

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editing the JET colormap
You should be able to do something like this: imagesc(peaks(123)) cx = caxis; n_colors = 128 cmp = jet(n_colors); colorbar ...

7 días ago | 1

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Answered
How can I check that a newly generated sequence is already in the existing structure list or not?
For example this can be used: intersect([1 2 3;1 3 2;2 1 3;2 3 1;3 1 2],[3 2 1],'rows') % %ans = % % 0x3 empty double matr...

7 días ago | 0

Answered
2d interpolation from a non-uniform grid
No you can use griddata and scatteredInterpolant. You can do something like this: Zi = griddata(X(:),Y(:),Z(:),Xi,Yi); And you...

8 días ago | 0

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Answered
How could I use MATLAB to solve for x with this equation, 0=a*x^(3)+b*x^(-1)+c.
This works perfectly fine: f = @(x ) -58.8*(550) + 0.5*37*0.002377*x.^3.*(0.02+0.062*((2*960)./(0.002377*37*x.^2)).^2); plo...

8 días ago | 0

Answered
Please help me convert them into a function of theta
When you get such an error, your first action would be to look at the sizes of the variables you use: whos r wab L r theta Nex...

8 días ago | 0

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ODE 45 range for the variables
If you want to start your ode-integration at an [x,T]-point of [0,298] you have to define your y0 like this: y0=[0 ; 298]; %ini...

9 días ago | 0

Answered
Matrix product and inversion speed up
My comment still seems relevant. A simple commandline test gives: tic,AA = ones(3e4,2)*(ones(2,3e4)*ones(3e4,1));toc % Elapsed...

13 días ago | 0

Answered
Getting an unknown error on calculating Standard Deviation.
Your variable v is a uint8. Try: std(double(v)) HTH

14 días ago | 0

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Evaluate the triple integral and sketch the given solid
Whenever you are faced with a problem to solve start trying to solve it with the methods at hand. 1, You surely know how to do ...

14 días ago | 0

Answered
How to make a double integration with numerical integration?
Why not use integral2 to integrate over 2-D domains - it can handle, at least, boundaries in the y-direction that are functions ...

14 días ago | 0

Answered
How to show a deformation of a sphere
Keep track of the x, y, and z-lims or the axis-limits. Something like this: tiledlayout(1,2); [X, Y, Z] = ellipsoid(0,0,0,1,1,...

14 días ago | 0

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Answered
ODE system with variable parameter, Boundary conditions and domain
This could be done something like this: Dall = {0:0.1:1,0:0.1:2}; % however many domains you need etc Y0 = {[Tt01;Pt01;M01],[T...

15 días ago | 0

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Answered
Integrate PDEPE solution wrt x
This rather straightforward method should get the job done (assuming you cannot get away with simply use trapz, or cumtrapz, but...

16 días ago | 0

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Answered
How to calculate |x|
abs(x) When you look for functions you should learn about the matlab-command lookfor, have a look at the help and documentation...

17 días ago | 0

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Curve fitting of two different datasets with two different equations and parameters to compare
This is why I never use the fancy curve-fitting-gui-tool, but do it explicitly with fminsearch or lsqnonlin. That way I have mor...

19 días ago | 0

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Answered
How to solve exponential distribution equation using symbolic Matlab?
It helps the int if you explicitly tells what the range to integrate over is: int(f,0,inf) HTH

19 días ago | 0

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Answered
Sturm-Liouville eigenvalues calculation
Have you checked the file-exchange contribution: discrete-orthogonal-polynomial. It solves this kind of problems numerically.

19 días ago | 0

Answered
common tangent of two curves with vpasolve.
In your code you gove starting-points for the variable you search for. Perhaps vpasolve doesn't bother to look for all solutions...

20 días ago | 0

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Answered
How to add arrows in plotted curves to point corresponding axis?
There are a number of arrow-contributions on the file exchange. These two are my favourites: arrow3, arrow, other contributions ...

20 días ago | 1

Answered
How to use wiener filter?
If you read the help for deconwnr you see that there is a third input, NSR, for the image Noise-to-Signal-Ratio. Since the Wiene...

20 días ago | 0

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Answered
Simulating lens tilt on image
OK, here's a two thirds (some reasonable-fraction) solution that computationally is not too shabby. In its current version it al...

22 días ago | 0

Answered
how to remove speckles from image?
Well the filtering you want to achieve is to keep structures with smaller spatial scales that have some magnitude above the spec...

23 días ago | 0

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