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Bjorn Gustavsson


UIT, the Arctic University of Norway

Last seen: 2 días ago Active since 2001

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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...

3 días ago | 0

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

8 días 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...

8 días 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...

10 días 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....

11 días ago | 0

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Answered
Local variance estimation for image filtering
You get that result because medfilt2 will select the median value of the pixel-intensities of your region, and completely discar...

12 días ago | 0

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Answered
How to read the coordinated from the plot in MATLAB 2018 version?
If you make a simple graph: ph = plot(X,Y); Then you can always extract the data-points from the plot-handle ph: xGraph = get...

12 días ago | 0

Answered
How to calculate the L2 (Euclidean) and L1 (cityblock, or we say Manhattan distance) distance based on longitude and latitude?
It seems to me that there is no obvious good definition of a Manhattan-distance on a spherical surface (even less so on a geoid)...

13 días ago | 0

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Answered
Colorbars belonging to more than one subplot/axis
perhaps something like this: figure(1) cx_12 = [min(min(var1(:)),min(var2(:))),max(max(var1(:)),max(var2(:)))]; cx_34 = [min(...

13 días ago | 0

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Answered
Processing large matrix faster
This ought to be done in one go: coods = M(:,M(:,3)<-80); In the case you cannot do it in a vectorized way and cannot determ...

13 días ago | 0

Answered
From char to double for plotting
First you should store the data-sets in some kind of array. For the most tolerant storage (that doesn't care about different dim...

15 días ago | 1

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Answered
Find 2D intersection in lat lon between curve (rivers) and satellite traces (2D polygon) on a map
If you have a single-pass of the satellite you could check what "river-points" are inside the ground-track with the inpolygon fu...

16 días ago | 0

Answered
Is there a way in MATLAB to guess the values of a matrix just like in the EES software?
You can easily initialize your variable to a fixed-valued array: a = 17; t = 16.05*ones([1,round(a)]); If you want a function...

19 días ago | 0

Answered
Mass of a wire in shape of helix
The symbolic tools make the default interpretation that all variables are complex. Therefore it cannot make that simplification....

19 días ago | 0

Answered
Diagnose Infeasibility of Simple 3-DoF Trajectory Optimization
Why not write the equation of motion component-by-component instead: function dydtd2ydt2 = dfu(~,y) g = 9.81; dydtd2ydt2 = ze...

19 días ago | 0

Answered
Create a surface with separate contours from other plots
Just concatenate all your n-by-3 data into a large many-by-3 array and then check up the help and documentation of scatteredInte...

20 días ago | 0

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Answered
How can I find rank of matrix?
First use pen (pencil) and paper to rewrite your equations into a normal matrix-form: Where M is a 4-by-4 matrix x is an arra...

20 días ago | 1

Answered
how to solve 3dof point mass equations of motion of flight vehicle
A three-degrees-of-freedom dynamic system in three spatial coordinates doesn't have yaw and pitch degrees of freedom. It is effe...

20 días ago | 0

Answered
Finding intersection between two 3D lines
You can do this rather automatic with geometry and linear algebra if you write your the positions and along lines as: If a...

21 días ago | 0

Answered
How to create mono phasic square waves with certain amplitude, pulse width and frequency for a certain time period
you could use square - for details check the help and documentation of that function. HTH.

22 días ago | 0

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Answered
Full surface from scatter by griddata!!!
This is "just" a pixellation-problem. You can see how it comes about by varying the resolution of your grid: [xq,yq] = meshgrid...

23 días ago | 1

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Answered
How to convert long to scientific e format in plots legend?
You could be a bit more explicit in the call to legend: txt = ['lambda = ',num2str(lambda(check))]; ph = plot(1:100, abs(Arec(...

23 días ago | 0

Answered
how to make polar plot with N x M matrix
You can have a look at these file-exchange contributions: pcolor-in-polar-coordinates, perfect-polar-plots, 3d-polar-plot. Or y...

23 días ago | 0

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Answered
Mutiple colorbars for mutiple scatter plots in the same figure
Have a look at the file exchange contribution newcolorbar-multiple-colormaps-in-the-same-axes. It seems as it should let you do ...

27 días ago | 0

Answered
How to change the colours of bars in a histogram with multiple data
If you take the output from hist and plot that with bar, you can do something like this: [phH1,phH2] = hist([re_low' re_high'],...

27 días ago | 0

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Answered
Three nonlinear equation with initial guess
Have a look at the help and documentation of fsolve. That should be the function for this task HTH

27 días ago | 0

Answered
Spectral Resampling from hyperspectral to multispectral
If you have a hyper-spectral image, I_hs, on the format [n_y x n_x x n_lambda] and you want to reduce the number of wavelength-c...

29 días ago | 0

Answered
2D data fit lsqcurvefit with NaN in grid
You could try doing this with lsqnonlin: x = [1 2 4 6 8 10 13 17 21 25]; y = [0.2 0.5 1 2 4 7 10 14 18 22]; z =[1,0.6844,0.30...

29 días ago | 0

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Answered
Calculation of consistent initial conditions for ODE
@Fabio Freschi, OK, now we're at least in the same general region of worrying. If I read decic correctly the use of the QR-outpu...

30 días ago | 0

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Answered
How to plot 3D suraface and contour lines?
To effectively use matlab sometimes one has to make functions vectorized - such that you can feed the function arrays and get al...

alrededor de 1 mes ago | 0

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