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Bjorn Gustavsson


Department of Physics and Technology, Tromsø University, Norway

345 total contributions since 2001

Physicist working in auroral physics, mostly on analysis of optical data, tomography-like inversions, ionospheric modeling.
Professional Interests: image processing

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Answered
Vibration Analysis by using Fast Fourier Transform
Yes, go ahead and fft individual columns, for plotting it seems most likely you would plot the absolute of the fft, or possibly ...

2 years ago | 1

Answered
[GUIDE] How to create scroll bar that moves the whole graph sideways?
If you look at the file exchange there seems to be several different submissions that does a range of different scrolling implem...

2 years ago | 0

Answered
How can I make evenly distributed point on hemisphere mesh ?
There are a couple of submissions at the file exchange that deals with this type of problem. Maybe one of them will be good enou...

2 years ago | 0

Answered
how to install regtools package
That is(might be) a toolbox with a number of useful functions for solving and anlysing inverse problems, typically you should pu...

2 years ago | 0

| accepted

Answered
Volumetric slice plot of tomographic data
If you change your colour-map from black-white to white-black then you might get some mileage out of experimentations with alpha...

2 years ago | 1

Answered
solving large number of simultaneous linear equations
If you simply use the standard numerical matrix capabilities of matlab something like this should be your solution: % I_L...

2 years ago | 0

Answered
how to use fractional Fourier transform on image in matlab
Perhaps as simple as using the 1-D fractional Fourier transform along either dimension? I found this on the file exchange: <htt...

2 years ago | 0

Answered
Can I model a 2nd order elliptical PDE using the PDE toolbox that has no BC for one of its edges?
Maybe I get this all wrong but to me it seems that what you implement in the FDM version is a Neumann BC with the gradient of th...

2 years ago | 0

Answered
fourier transform space dependent function
You shouldn't do the inverse Fourier transform element by element. The inverse Fourier transform should be calculated in the fre...

2 years ago | 0

Answered
How to generate signal with seasonal and diurnal component?
Well a first stab would be to look at this as a function that has a daily variation, i.e. a time-period of 24 hours, and then pe...

2 years ago | 0

| accepted

Answered
I have a discete probability distribution (histogram) and want to invoke rand to produce n random samples that follow the distribution specified by the histogram -how?
0, always start by looking for a solution at the file exchange. 1, I did a quick search and perhaps these submissions solves yo...

2 years ago | 0

Answered
Hi guys, I am working on Barrel distortion correction using MATLAB. I have written code as per correction algorithm. I am unable to mathematically compare corrected output with original image can you suggest me some parameter for it..
Well, if the only thing you have is the original image you cant really tell. You kind of have to trust the task-givers world tha...

2 years ago | 0

Answered
what must i do to bring a matlab program from Windows in ubuntu to work
Code contributer wasn't coding right for portability. Have a look at the documentation for fullfile and fileparts. Then set the ...

2 years ago | 0

Answered
random Distribution Points inside rectangle
Have a look at the documentation of rand. That function gives you uniformly distributed random numbers between 0 and 1 (have fo...

2 years ago | 1

Answered
CT Raw Images Reconstruction code
Shouldn't that just be a minor geometric transformation between the angles to your detector and the angles to the flat detector...

2 years ago | 0

Answered
Need to write a program that evaluates a postfix expression which is input by the user and then displays the answer.
If you want us to do your assignments you might have a better chance if you explicitly ask us to. What have you done so far? ...

2 years ago | 0

Answered
How can I plot spectrogram from discrete data?
Have a look at the documentation for the matlab function spectrogram: helpwin spectrogram From the question it seems t...

2 years ago | 0

Answered
Wrapping of cubic equation
Perhaps what you want is something like this: f_wrapped = rem(f,2*pi); HTH

2 years ago | 0

Answered
Unstable results using deconvlucy function
Without knowing exactly what your PSF looks like or is there are added noise to your delta-3D image, it is a bit difficult to gi...

3 years ago | 0

Answered
Fit a custom function to data with errors in all dimensions (i.e. nonlinear total least square, deming, odrpack?)
Well if you want some tools for matlab they aren't too difficult to find: <https://se.mathworks.com/matlabcentral/fileexchange/...

3 years ago | 0

Answered
How do I have matlab extract the max value of a column within a moving range?
If you have the image processing toolbox you have access to the function: ordfilt2 as far as I understand your question ...

3 years ago | 0

Answered
how many methods to solve de in matlab?
Sure thing! <https://en.wikipedia.org/wiki/Numerical_methods_for_ordinary_differential_equations Wikipedias overview-article on ...

3 years ago | 0

Answered
How can I show to column vectors side by side?
That should be as simple as: disp([[1;2;3],[6;4;1]]) HTH

3 years ago | 0

Answered
solve any amount of systems of linear equations
Well, this sounds like a task from introduction to linear algebra, so have a read-up on over-determined problems, and under-dete...

3 years ago | 0

Answered
Image Normalization between range 0 - 1
It sounds like you need to ask your advisor what he wants. In my not necessarily humble opinion images ought to contain differen...

3 years ago | 1

Answered
fminsearch with vector function and vector output
For that function it is rather trivial, so you wouldn't need numerical methods. For a more general function f(x,a) it might ...

3 years ago | 0

Answered
how can i determined the spectrum of potential for a finite well
Well, to me it sounds like homework on quantum mechanics, so my suggestion is that you read the relevant chapter. In case you ne...

3 years ago | 0

Answered
What is best practice to determine if input is a figure or axes handle?
Simples, write those functions yourself, something along the lines: function OK = isfigure(h) if strcmp(get(h,'type'),...

3 years ago | 0

| accepted

Answered
My files are a mess, please help
In addition to the above answer I'd like to add a few more points. # you write functions for a couple of reasons, one of the ...

3 years ago | 0

Answered
Plotting in GUI of Matlab
Keep the handles to the axes you create: axs(1) = subplot(1,2,1); axs(2) = subplot(1,2,2); Then make the axes you wan...

3 years ago | 0

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