Bjorn Gustavsson

UIT, the Arctic University of Norway

Last seen: Today | Active since 2001

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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 ...

2 days ago | 0

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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...

2 days ago | 0

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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...

2 days ago | 0

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

2 days ago | 1

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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...

2 days ago | 0

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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,...

3 days ago | 0

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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...

7 days ago | 0

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

12 days ago | 0

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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...

12 days ago | 0

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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...

14 days ago | 0

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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....

15 days 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...

16 days ago | 0

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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...

16 days ago | 0

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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)...

17 days 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(...

18 days 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...

18 days ago | 0

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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...

19 days ago | 1

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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...

20 days ago | 0

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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...

23 days ago | 0

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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....

23 days ago | 0

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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...

24 days ago | 0

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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...

24 days ago | 0

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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...

24 days ago | 1

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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...

24 days ago | 0

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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...

25 days ago | 0

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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.

26 days 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...

27 days 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(...

27 days ago | 0

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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...

27 days 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 ...

1 month ago | 0