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Bjorn Gustavsson


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UIT, the Arctic University of Norway

273 total contributions since 2015

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Answered
How can I improve code efficiency?
First step of improving code is to run the scripts and functions with the profiler on (seel documentation and help for profile) ...

1 day ago | 0

Answered
Some question about a special code for solving an ODE system by Runge-Kutta method
Since u1 and u2 depends on p1, p2 and p3, that in turn will depend on time, you have 6 coupled ODEs. The best(?) way to solve th...

2 days ago | 0

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Answered
Curve fitting of a custom equation with a predefined value
For this type of problems I typically use the basic optimization-functions of matlab - either fminsearch or lsqnonlin depending ...

5 days ago | 0

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Answered
how to get eigenvalues of a function matrix?
To calculate the eigenvalues of H you have to chose, either to use your implementation where H is a handle to a function returni...

1 month ago | 0

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Answered
How do I create a new folder each time I run a code?
This is easily solved: dirname = fullfile(path_2_root_dir,sprintf('NewFolder-%s',datestr(now,'yyyymmdd-HHMMSS'))); mkdir(dirna...

1 month ago | 0

Answered
Images don't show properly with imshow after certain calculation
When you do things like this the errors are always (in my experience) in different normalizations and type-castings. To work the...

1 month ago | 0

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Answered
Press " " to rename 4 instances of "VariableName1" to "VariableName2"
That ought to be the return key... HTH

1 month ago | 0

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How to compute SVD of a matrix without using in-build SVD command?
So this is a homework task, right? (Unless you come up with a good reason this is the case everyone have to come to this conclus...

2 months ago | 0

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analytical solution of ODEs
This should be done thisly: syms r syms T(r) dTdr = diff(T) d2Tdr2 = diff(T,2) T = dsolve(1*d2T+((1/r)*dT) ==1,T(0.005)==20...

2 months ago | 0

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How to graphically/interactively select region of interest from 3D point cloud data
In newer versions of matlab there seems to be just such a feature, see: ROI.CUBOID For older versions of matlab (I vaguely rec...

2 months ago | 0

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Answered
Obtaining a equation in two variables (x and y) from a set of data points
What you should do depends on your objective. If you very explicitly want a function you could use spap2 (and perhaps some of it...

2 months ago | 1

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Answered
Hello, we have received a Matlab code in school and the assignment is to explain what it means. I wonder if anybody could take us through the code and explain it?
At the matlab command-line prompt type: dpstop in nameiofscript where nameiofscript is the name of the script-file. Then you r...

3 months ago | 0

Answered
How to obtain CDF from large dataset?
Have a look at the help and documentation of the function ksdensity - that is one way to do this with the least amount of assump...

3 months ago | 0

Answered
Difference in frequency domain between mp3 and wav
There are some small differences. You should also try to compare the spectrograms of the two signals, see the help for spectrogr...

3 months ago | 0

Answered
How to edit matlab saved file?
I think something like this should work: filename2edit = 'something.mat'; load(filename2edit,'X2change') X2change(3) = 12; s...

3 months ago | 0

Answered
I would like to plot Histogram and relative frequencies from a given dada.txt. I already plot time series plot for the given data. KIndly help me to plot histogram and relative freqs.
Have a good look at the help and documentation of histogram function. It should let you solve this task easily. HTH

3 months ago | 0

Answered
Solving 4th order ode problem
In general you convert a high-order ODE to a set of first order ODEs like in this example below (I will use a simple equation of...

3 months ago | 0

Answered
partial differentating a matrix by a vector
Have a look at the help and documentation for jacobian. HTH

3 months ago | 0

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Answered
Is it possible to plot a 3D graph with non numerical values?
The simplest method might be to map your classes to some integer range and then use the standard plotting functions. In your cas...

3 months ago | 0

Answered
How to display figure in full-screen mode programmatically and save as a high resolution image?
To save as high-resolution, I regularly use: print('-depsc2','-painters','J.eps') If you desperately want the image as a png-i...

3 months ago | 1

Answered
How to store 2D variables in matrix
For the storing the point coordinates you might look at either cell-arrays: r1 = [1,2,3]; r2 = [3,2,5]; r3 = [4.5,pi,1,5]; %...

3 months ago | 0

Answered
Problem getting number of ticks and labels to work properly
Do you get your xticks at the even years with the xticklabels for the first 6 years? You can at least check the x-tick values w...

3 months ago | 0

Answered
De-resolution of Dicom Image
So you problem is that you cannot figure out how to save a file to a new same-name file in another directory? If so something l...

3 months ago | 0

Answered
A switch case statement that will help me to either run codeS in Windows or linux, based on whichever OS it is
Have a look at the commands: computer, ispc, insunix, ismac. HTH

3 months ago | 0

Answered
zoom plot into plot
Maybe this file exchange contribution does what you need: zoomplot Or any of these: on-figure-magnifier, maginset, interactiv...

3 months ago | 0

Answered
How to find angle between two lines?
A more stable method that what Jos suggested is v_1 = [x2,y2,0] - [x1,y1,0]; v_2 = [x3,y3,0] - [x1,y1,0]; Theta = atan2(norm(...

3 months ago | 1

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Answered
How to find angle between two lines?
Look and you will find. HTH

3 months ago | 0

Answered
Integrating function of t over numerical values
Yes, that means that the function you call integral with is called with an array of values - therefore your function (the long e...

3 months ago | 0

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Answered
Multiple color plots / colorbars on a single axes
There are some contributions on the file exchange that deals with this. I thik this is one: colormat-and-colorbar-utilities You...

3 months ago | 0

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Answered
Given 2 red beads, 2 blue beads, 1 yellow bead, and 1 green bead, how many different necklaces can be made?
Why not just remove the non-unique necklaces? See the help and documentation for unique for how to do this. HTH

3 months ago | 0

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