Bjorn Gustavsson

UIT, the Arctic University of Norway

Last seen: Today | Active since 2001

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Answered
variable number of if condition
Maybe something like this: for i = min:max %:columns b = 1; d = 1; f = 1; for a = 1:length(Ex) for i_c...

environ 7 heures ago | 0

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Why does this code generate a mix of integers and doubles?
In practice you can look on this problem as "good luck" and "bad luck" when it comes to working and not working. The rounding of...

environ 12 heures ago | 0

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Answered
Remove noise from the image
First start by trying standard filtering-methods. Compare what you get with 2-D median-filter (medfilt2), and Lee's sigma-filter...

2 jours ago | 0

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Function GUNZIP was unable to read URL ''http://opihi.cs.uvic.ca/sound/genres.tar.gz''.
If the file doesn't exist then nothing will be able to read it. I wouldn't bother using gunzip, I'd go for straight downloading ...

3 jours ago | 0

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Answered
True north-based azimuths
Your question doesn't make much sense, sure you can do that - but that would be more of "establishing" your azimuth-convention. ...

3 jours ago | 0

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Incorrect dimensions for raising a matrix to a power
Just set a debug-stop in that function and check what dimensions your variables have: dbstop in gaussh Or just at the point wh...

5 jours ago | 0

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Filtering the large precipitation data for finding rainfall events
If you store your rain-fall-data in an array, r_f for rain_falls, with n_t rows and n_stations columns you could easily do thing...

5 jours ago | 1

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Answered
How to fit regression
This is not a polynomial, therefore you cannot use polyfit. You can seamlessly use any least-square fitting routine to fit your ...

6 jours ago | 0

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curve of best fit
In order to get a function that has two y-values for for some range of x-values you will cannot fit a polynomial such that y=p(x...

6 jours ago | 1

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Answered
how can compute a marginal distribution?
Look at the help and documentation for the histogram-function. Possibly also check the histogram2. HTH

6 jours ago | 0

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Solving a system of linear equations with lots of o coefficients.
Matlab is designed to solve systems of linear equations. It is one of the fundamental operators of its matrix-algebra: % Your p...

7 jours ago | 0

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Reading and analysing files in subfolders - indexing
Why not skip the generation of FileName and index into files directly inside the loop: dt = 0.005; tt = 0:dt:60; files = dir(...

8 jours ago | 0

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Trajectorys of 4 objects on 3D plane not symmetrical
Your main problem (or rather: step to take) is that you do the calculations element-by-element in the different arrays. That is ...

9 jours ago | 0

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Answered
Trying to use central difference scheme to solve logistic equation
Well run your code line-by-line and figure out what the problem is. This is what you let us know about your script (My comments...

12 jours ago | 1

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How to calculate jacobian matrix for R^n X R^n system in matlab
Maybe this illustration of how to reshape your variable x and function f from n-by-n to n^2-by-1: syms x [2,2] % a small n-by-n...

13 jours ago | 0

Answered
Plotting 2 functions on the same graph
Skip the calls to subplot? That would make your scrip "not put the graphs in 2 separate axes": x1 = Pos1(t); x2 = Pos2(t); ph...

13 jours ago | 0

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Answered
How does Matlab uses memory inside a function?
Matlab is very clever in memory usage in functions, pass-by-reference-copy-on-modification. So as long as you only take values o...

14 jours ago | 0

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Answered
Using Shooting Method on Euler Method to Solve Second Order BVP
To do that you should make functions out of this script. That way you will have a much cleaner programme, that is far easier to ...

15 jours ago | 1

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Answered
Mapping toolbox: irregular measured geo referenced data into regular grid
"5m" sounds like a reasonably small region of data? If so, local topography might be more important than the curvature of Earth....

16 jours ago | 0

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Pseudo-spectral method solution for wave equation PDE: d^2p/dt^2=(c^2)*[d^2p/dx^2 + d^2p/dy^2 + d^2p/dz^2]
This is just a linear wave-equation with constant speed of the waves. The general solution is just: So you just have to deter...

17 jours ago | 0

Answered
How i can solve limit this ODE question .
This is a Riccati equation. Convert it to a standard linear second-order differential equation and solve it that way, check what...

18 jours ago | 0

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extrapolation of contour data set
Since the minimum value of your counttest-variable is 0.0853 or thereabouts you will never get any contour for levels lower than...

19 jours ago | 0

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Answered
Solving an ode for newton with vectors
The thing you have to fix here is the indexing of r in your equation-of-motion. You have to extract the 3 velcity-components for...

25 jours ago | 0

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solving ode in a given grid
If you have the analytical function for how your t depends on x you should be able to calculate t for any x inside your ODE-func...

26 jours ago | 0

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Plotting meteorological data on Geographic maps
If you don't have access to the mapping toolbox you might find good use of the m_map toolbox: m_map. It have helped me make plot...

27 jours ago | 0

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How can I display text on pcolor map like in the image below?
If you have your text-strings and their respective location you should be able to do this brute-force: pcolor(X,Y,Z),shading in...

27 jours ago | 0

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How to add text to a line in the plot?
With text you specify both the x and y-coordinate of the text. For example: th = text(14,-0.5,'text-test that will start at x: ...

29 jours ago | 1

Answered
How can I classify two different types of radar modulation from images obtained in the time-frequency analysis?
The second modulation is obviously a chirp. How can I be so sure? Well I cannot because there is no way I can distinguish a poin...

environ un mois ago | 0

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Answered
Raw data accelerometer to velocity
Acceleration is derivative of velocity, to get velocity from acceleration summation do you must.

environ un mois ago | 0

Answered
How to increase number of contour lines in a plot?
If you check the documentation you will find this advice: fcontour(f,'LevelList',[-1 0 1]) which adapted to your xy-region wou...

environ un mois ago | 0