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# Bjorn Gustavsson

### UIT, the Arctic University of Norway

Last seen: 2 Tage vor Aktiv seit 2001

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Beantwortet
Deconvolution of experimental peaks
Have a look at the help and documentation of deconvblind. If you make sure that the curve you want to deconvolve and the point-s...

5 Tage vor | 0

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how to make curved arrow
There are a number of submissions on the File Exchange that helps you with this: circular-arrow-around-vector, circular_arrow, ...

5 Tage vor | 0

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How to get the numerical rank of the matrix in matlab?
If you can afford it you might consider looking at the singular vaules that you obtain from the svd of your A-matrix. That will ...

5 Tage vor | 0

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Is there a way to export the results of PDE's solution to the gradient？Or the gradient can be calculated from the exported triangular node result？

12 Tage vor | 1

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Summing and multiplying matrices of different size
Check that you get what you expect from each product and term separately. Then figure out what you should do to fix your discrep...

12 Tage vor | 0

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Unexpected phase delay via cross-correlation ? Method issue or bad data?
The phase-jump is just the branch-cut of angle (or atan2). As a measure of phase-shift between 2 harmonic signals it is equivale...

13 Tage vor | 0

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How do I plot a Poincare plot for a non-autonomous ODE's?
This sound like a perfect example of when one should use the events capabilities of the ODE-solvers. If you look at the code of ...

14 Tage vor | 0

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How to get average of data using different time range?
QD-suggestion (from someone too lazy/stupid/old/stubborn to learn to use arrayfun): Temperature = randi([-20 40], 24*365, 1); %...

17 Tage vor | 0

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Beantwortet
Parse 1 large column of uneven data into an array of columns by nth rows.
If your file contains an equal number of samples for every "loop" and the files contains data from full "loops". Then something ...

17 Tage vor | 0

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Grid colormap with colorized circles
Something like this shouldn't be too complicated to cook up. Perhaps this is a start: function h = cwheel(x0,y0,phi0,r,nspokes)...

17 Tage vor | 1

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Beantwortet
Reconstructing a surface from mesh points and function values (from COMSOL)
Are you sure that you need to use scatteredInterpolant at all? The points in the first plot seem to be on a regular grid. If tha...

19 Tage vor | 0

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Unable to find explicit solution
This looks like an attempt to derive and solve equations of motion with Euler-Lagrange equations. If that's the case there are t...

19 Tage vor | 0

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Unable to understand how to use the function given on the site below
files with the extension .gz are typically compressed with gzip, that use the Lempel-Ziv coding. The most effective way to handl...

21 Tage vor | 0

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How to implement this kind of coding ?
You while-loop will continue as long as the test-condition is true. You want to continue "a couple" of iterations after your des...

24 Tage vor | 0

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Converting multiple lines into separate equations from jpeg?
In similar situations I typically separate the problem into two steps, first extracting the curves, then fit parameters for equa...

26 Tage vor | 1

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How can I transform this curved wall to a flat wall without any distortions in the image? Is there any code available for it?
Sure thing. First assume that all bricks are flat bricks of exactly the same size. Then identify the edges of each brick in the ...

26 Tage vor | 0

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griddata vs griddedinterpolant vs scatteredInterpolant for given data
griddedinterpolant expects points on a regular grid pretty much like interp2 - so that function seems unsuitable for your case. ...

26 Tage vor | 1

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pcolor LOOP of current speed and a map of the area.
If you take care of the handle you get from pcolor you should be able to do something like this: H = pcolor(...) % Initial pl...

27 Tage vor | 0

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Optimise vertical position of nodes for shortest sum of paths
If this is a one-off calculation just brute-force search shouldn't be too bad, the y-position of the nodes should be within a sm...

etwa ein Monat vor | 1

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Installation on Ubuntu 22.04 LTS finished but there is no Matlab
To me this sounds like you forgot to create a link to the executable from a directory on your path. Here's how I check where I h...

etwa ein Monat vor | 1

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Beantwortet
Diffraction pattern of plane wave through Circular Aperture
Your first problem is surely that all your variables are 1-D arrays and it seems you still only model some kind of linear apertu...

etwa ein Monat vor | 0

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Beantwortet
Remove specific contours or make them invisible
The easiest way is to continue with the algorithm where you save the level-2-contours with a level one contour inside. Then you ...

etwa ein Monat vor | 0

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Find two contours at different levels around the same peak
You could (QD algorithming-from-the-hip) use the contour-coordinates in c1 and c2. Typically I find it easiest to break them con...

etwa ein Monat vor | 0

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Beantwortet
How to set the name with num2str in for loop?
Perhaps it is as simple as: for k = 1:1000 % assign the content of the file directly to variable A: A = load(['cp_',n...

etwa ein Monat vor | 0

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Beantwortet
Errorbar plot in colormap
You might get away with putting the errorbar-call in a loop. Perhaps something like this: figure(); clf box on hold on cmp ...

etwa ein Monat vor | 0

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Beantwortet
What is the Fourier Series Coefficient of F=exp(sin(x))?
Might I be so bold as to suggest (physicist writing about calculus here...) that this task ought to have some clever analytical ...

etwa ein Monat vor | 0

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How to use ode45 efficiently on a large input vector
If the ODE-system you're trying to solve is something like a set of independend equations of motion that only couple "pairwise" ...

etwa ein Monat vor | 1

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for loop, in irregular numbers clusters?
You will have these lists of "todos" and "not-todos" from somewhere outside, since, as you write, you can't type down all the nu...

etwa ein Monat vor | 0

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Beantwortet
How can I find dip direction and a dip of a plane with known normal vectors?
Some corrections you might consider are: load('artificial_slope.txt') %loading data % defining input values based of input txt...

etwa ein Monat vor | 0

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Automatically define anonymous functions.
You can solve this problem using matlabFunction to generate a function-handle: C=[-1,1,1+1/4*i,-1+1/4*i]; syms x; f=@(x) x.^2...

etwa ein Monat vor | 0

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