Community Profile

Bjorn Gustavsson

UIT, the Arctic University of Norway

249 total contributions since 2015

View details...

Contributions in
View by

How to find angle between two lines?
A more stable method that what Jos suggested is v_1 = [x2,y2,0] - [x1,y1,0]; v_2 = [x3,y3,0] - [x1,y1,0]; Theta = atan2(norm(...

9 hours ago | 1

How to find angle between two lines?
Look and you will find. HTH

11 hours ago | 0

Integrating function of t over numerical values
Yes, that means that the function you call integral with is called with an array of values - therefore your function (the long e...

14 hours ago | 0

| accepted

Multiple color plots / colorbars on a single axes
There are some contributions on the file exchange that deals with this. I thik this is one: colormat-and-colorbar-utilities You...

3 days ago | 0

| accepted

Why not just remove the non-unique necklaces? See the help and documentation for unique for how to do this. HTH

3 days ago | 0

stream lines for discrete data set of velocities
Your question is a bit too vague. Or rather, the input-data you have is a bit vaguely described. The answer depends on how you'l...

3 days ago | 0

| accepted

Is there a way to Un-clip a sine wave?
You can do something like this: sfcn = @(t,pars) pars(1)+pars(2)*sin(pars(3)*t+pars(end)); % sine-like function with offset and...

4 days ago | 0

| accepted

Plotting graph with variables on x axis
Something like this: y = randn(123,1); x = linspace(0,1,123); plot(x,y) xtstr = {'0','0.2d','0.4d','0.6d','0.8d','1d'}; set...

4 days ago | 0

| accepted

Dynamic model of a bending spring
Start reading up on the topic of beam-theory. Then come back with matlab or ODE/PDE-based questions which are more suitable for ...

5 days ago | 0

How to assign to an already 3d surface a colormap based on a set of values ?
This is how I'd do this: surf(x,y,z,Temps),shading flat This you dont have to view from above. HTH

5 days ago | 0

i want to fill zeros inbetween vector elements
Looks like you should turn to matlab's sparse arrays. Something like this should be a shortest-ish code-snippet to do what you n...

5 days ago | 0

Coherence as a function of time
Have a look at mscohere, and its help and documentation. It should allow you to calculate the coherence. My version resides in t...

5 days ago | 0

Using spectralFlux to plot Flux of a vector
It is not at all clear what you want to do, spectral flux is not a term I've heard before - this might be because I'm ignorant, ...

6 days ago | 0

matrix contain index track
Sure: I = [1, 3, 1, 4; 2, 3, 2, 4]; % Then operate away... But it is very unclear if that is what you really want. Do...

11 days ago | 0

Problems with waitbar sizing
Have a look at this command-line progress-bar version. It is less visually intrusive when working with other stuff while matlab ...

11 days ago | 0

Histogram with circular bars
I would do something like this: edges = 0:15:360; N_all(1,:) = histcounts(M1,edges);% Put one histogram per row into N_all N_...

11 days ago | 0

Unusual arrangement of plot
Seems like you want the plot done with the radii sorted? (plot plots what you feed it, if you have the x-variable unsorted the p...

14 days ago | 1

How to find the square root fo complex square
What's wrong with: sqrtZ = sqrt(Z); ? Then possibly work out the other root if necessary. HTH

14 days ago | 0

Problem implementing finite difference method at edges of periodic functions
What I'd usualy have to do in this situation is to extract the differentiation matrices - just to check that all elements become...

15 days ago | 0

What starting point to choose so fsolve always returns a solution when any exists?
This depends on how you have parameterized your surface. For the most general case (curve - circle), where you have a curve para...

17 days ago | 1

How does MATLAB deal with wanted linear dependencies?
That's not the problem. What you should look at is how "wellconditioned" your model-matrix X is. Look at this example: [x,y] = ...

18 days ago | 0

create freehand region of interest
Have a look at ginput (there are a couple of improved/modified versions on the file exchange), that function should give you the...

18 days ago | 0

What is the best way to animate a rocket trajectory through matlab?
I would look for some of the arrow-contributions on the file exchange: Arrow3, arrow - and then simply loop over time calculate ...

19 days ago | 1

How to make a common color bar?
This is how I do this neatly: subplot(1,1,1) cbh = colorbar_labeled(''); subplot(2,2,3) plot([0 2]) subplot(2,2,2) imagesc...

19 days ago | 0

| accepted

Subscript indices must either be real positive integers or logicals. how can i change? thanks!
Matlab uses 1-based indexing to vectors, so your line: i(0) = v0; %initial condition Has to be changed to: i(1) = v0; %initia...

19 days ago | 0

finding all local minima of histogram
If you read the help of the hist function you'll find: N = HIST(Y) bins the elements of Y into 10 equally spaced containers...

24 days ago | 0

Cut a matrix after a certain value
Try: rowNum = find(any(Acum1 > 2500,2),1,'first'); % 1440*60= 86400 secondi. è il tempo disponibile nella giornata if isempty(...

25 days ago | 0

| accepted

scatteredInterpolant giving unexpected plateaus
When I tried to download the mat-file I get nothing when I try to load it, it seems empty, could you check that the one you actu...

25 days ago | 0

Visualization of 4D Plot
Perhaps you're asking for something like this: [X,Y,Z] = cylinder(linspace(1,1.5,100),100); % You have to specify your cylinder...

25 days ago | 0

| accepted