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Bjorn Gustavsson


UIT, the Arctic University of Norway

268 total contributions since 2015

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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...

5 days ago | 0

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

6 days ago | 0

Answered
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...

18 days 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...

19 days 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...

20 days 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...

20 days 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...

1 month ago | 0

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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...

1 month ago | 0

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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...

1 month 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...

1 month 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

1 month 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...

1 month ago | 0

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

2 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...

2 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...

2 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]; %...

2 months ago | 0

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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...

2 months ago | 0

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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...

2 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

2 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...

2 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(...

2 months ago | 1

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

2 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...

2 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...

2 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

2 months ago | 0

Answered
stream lines for discrete data set of velocities
Your question is a bit too vague. Or rather, the input-data you have is a bit vaguely described. The answer depends on how you'l...

2 months ago | 0

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Answered
Is there a way to Un-clip a sine wave?
You can do something like this: sfcn = @(t,pars) pars(1)+pars(2)*sin(pars(3)*t+pars(end)); % sine-like function with offset and...

2 months ago | 0

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Answered
Plotting graph with variables on x axis
Something like this: y = randn(123,1); x = linspace(0,1,123); plot(x,y) xtstr = {'0','0.2d','0.4d','0.6d','0.8d','1d'}; set...

2 months ago | 0

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Answered
Dynamic model of a bending spring
Start reading up on the topic of beam-theory. Then come back with matlab or ODE/PDE-based questions which are more suitable for ...

2 months ago | 0

Answered
How to assign to an already 3d surface a colormap based on a set of values ?
This is how I'd do this: surf(x,y,z,Temps),shading flat This you dont have to view from above. HTH

2 months ago | 0

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