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Bjorn Gustavsson


UIT, the Arctic University of Norway

Last seen: Today |  Active since 2001

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Answered
How can i fit ODE parameters to given frequency and amplitude data pairs with "lsqcurvefit"?
There are two issues you will have to solve. The first is to convert your second order ODE to two coupled first-order ODEs. The ...

alrededor de 3 horas ago | 0

Answered
Surface plot of scatter data X,Y,Z where unknown data is noise
If you have a good handle on the noise-distribution you could do that. But for plotting purposes I would go for setting missing ...

1 día ago | 0

Answered
Test if input number is divisible by 3.
Have a look at the help and documentation for while. Also from the question I guess that you're reasonably new to programming. I...

1 día ago | 0

Answered
Fast fourier tranformer for Time series data
It seems that you're a bit too close to the Nyquist frequency. If you try: [NUM,TXT,RAW]=xlsread('data.xlsx'); dt = mean(diff(...

2 días ago | 0

Answered
Anisotropic diffusion for a fingerprint image: how to correctly set up the parameters to get desired result(s).
You might find that you have more control over the anisotropic diffusion with the cedif or eedif functions from the nonlinear-di...

2 días ago | 0

Answered
Detect and remove outliers in signals
Be very cautious when changing bad-data-values to some default-value - that will eventually lead to (since we all know that the ...

5 días ago | 0

Answered
Histogram or bar graph with greater than bin?
Maybe something like this would be good enough/a step on the way: a = 75*randn(2048,1).^2; h = histogram(min(a,260),0:10:260,'...

5 días ago | 1

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Answered
Append to original file name and and save new file to directory?
You should be able to separate the path, name and ext of the full filename using fileparts. That should make it reasonably strai...

5 días ago | 0

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Answered
Linear interpolation using inter1 function in matlab
First you should learn to read the help to the function you struggle with. Do that carefully and you will see that the typical u...

5 días ago | 0

Answered
Is it possible to generate a sine wave like this? I tried combining 50hz, 100hz and 200hz together but I did not get something like this picture that I provided here.
Yes it is possible. You will have to make the phase-angle match at the frequency transitions (for simplicity make the time-windo...

6 días ago | 1

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Answered
two consequtive cursor's position in a while loop
Just after you have extracted and exported x in your while-loop you now have the next x-previous, so just stack that one away. S...

6 días ago | 1

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Answered
How to build a 3D chart/plot from scattered/raw data?
If you have a dense enough sampling you could use the scatteredInterpolant to get interpolated values at a regular grid and then...

6 días ago | 0

Answered
Plot deviation of curve as shaded area inside
Have a look at the file exchange. There there are multiple "shaded-error-plots". For example (without ordering of merit): jackk...

19 días ago | 0

Answered
Solving Linear Systems for Multibody Systems
As best I can interpret your flow-chart it seems that it ought to be "reasonably straightforward" to follow Torsten's advice by ...

19 días ago | 0

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Answered
finding the orthogonal vectors for a series of vectors
This is how I would do it: nVecs = 12 allVecs = randn(nVecs,3); for i1 = size(allVecs,1):-1:1 u_test = randn(1,3); whil...

19 días ago | 1

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Answered
Is there a way to deconvolute this peak, without knowing the convoluting peaks?
You might get some part of the way with deconvblind, from the image processing toolbox, so check the help and documentation to t...

21 días ago | 0

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Answered
Deleting every 2nd element of a cell array.
If you want to delete every odd row you do this: X(1:2:end,:) = []; If you want to delete every even element you do this: X(2...

21 días ago | 0

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Answered
casting without rounding using coder
Well, the only interpretation I can thing of that matches the "casting without rounding" in a sensible way is: ind = int32(...

29 días ago | 0

Answered
Find minors of a rectangular matrix
As far as I understand this one definition of generating one k-minor from an arbitrary matrix of size n-by-m is to select k rows...

29 días ago | 0

Answered
How to create a rectangular pulse train of amplitude '1' with user-defined time period?
You should be able to do that with the square function, check its help and documentation. You might need to add 1 and divide by ...

alrededor de 1 mes ago | 0

Answered
Make spectrogram of LFP using chronux package
From the help of that function you will see that the output S should be: 0050 % S (spectrum in form time x frequenc...

alrededor de 1 mes ago | 0

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Answered
How to homogeneous two different images into same color after image stitching
You should have some good use for the histogram-matching contributions found on the file exchange. For example: https://se.math...

alrededor de 1 mes ago | 0

Answered
Create a cell array containing the first 3 doubles from another cell array
Would: ThreeFirst = cell2mat(CCC(1:3)); do the trick?

alrededor de 1 mes ago | 1

Answered
Finding Maximum Consecutive Dry Days in Daily Rainfall Data
Don't do it with loops, that is a lot of work. Use the vectorized functions to your advantage. Here's how to get at it with usin...

alrededor de 1 mes ago | 0

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Answered
How to make 2D matrix from 3D matrix to solve 2D nonlinear system?
For the interior of your grid you can rather easily calculate the Laplacian operator something like this: NperSide = 50; [x,y,...

alrededor de 1 mes ago | 0

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Answered
operating Matlab via Ubuntu terminal
It should be possible to do things like this from any standard unix-terminal: $ matlab -nodesktop -nosplash -r YOUR-SCRIPT You...

alrededor de 1 mes ago | 0

Answered
Value dash outside a 2D plot
You can do this: set(gca,'TickDir','out') HTH

alrededor de 2 meses ago | 0

Answered
Creating a graph with error bars
You can use the errorbar function for plots like this. Check the help and documentation for that function. If that function does...

alrededor de 2 meses ago | 0

Answered
How to extract values within a circular region from a griddata?
You "simply" only ask for the values inside that circular region. You can do it at least two different ways: N = 100; xv = lin...

alrededor de 2 meses ago | 0

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Answered
2 equations, 2 unknowns - fminsearch(), fminunc() applied on numerical data
From your description you have 800-by-1300 linear equations of the type: a + x = b + y and you want to solve for both x and y....

alrededor de 2 meses ago | 0

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