Bjorn Gustavsson
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UIT, the Arctic University of Norway
802 total contributions since 2001Bjorn Gustavsson's Badges
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Awarded to Bjorn Gustavsson on 09 Oct 2019
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Awarded to Bjorn Gustavsson on 26 Mar 2019
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Awarded to Bjorn Gustavsson on 20 Jul 2017
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Awarded to Bjorn Gustavsson on 20 Jul 2017
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Awarded to Bjorn Gustavsson on 12 Feb 2012
Integration with both limits variable
Matlab has both a numerical and a symbolic version of the error-function. That will be the answer to your problem. The numeric v...
15 hours ago | 0
Reduce computational time for ODE solver
Have you tried the other ODE-integrating functions? From your problem description it sounds like your ODEs are stiff - for that ...
1 day ago | 0
| accepted
2D colormaps. MxN matrix of RGB values for 4 colors gradient
If you do something like this: [hsvImg] = rgb2hsv(Imrgb); x_lims = [1 184; 199 383; 397 581; ...
3 days ago | 1
Integrating min and max function
This might not be the most elegant solution to this, but it's a first stab. Take a quick-look at what the function looks like: ...
3 days ago | 0
Maximization of a Function
When I create a sequence of functions like that I always have to have the input-variables explicitly visible on the right-hand s...
4 days ago | 0
Improving the computation speed of loops
When you want to search for ways to optimize your code always run it with the profiler to identify where the time is spent. pro...
5 days ago | 0
Image fusion of 3 images
Perhaps: Im_fused = Im1/3 + Im2/3 + Im3/3; or more generally: w = [1 2 3]; w = w/sum(w); Im_wfused = w(1)*Im1 + w(2)*Im2 + ...
5 days ago | 0
Legend Color doesn't Match the Curves Color
That's peculiar. What happens if you keep the plot-handle from your calls to semilogy and send that to legend? ph = semilogy(z,...
5 days ago | 0
Fourier transform of a picture?
Note that the actual Fourier transform is the second row of your equation, while the first factor you can see as a matrix with n...
9 days ago | 1
Harmonic Oscilation. When I plot f towards time amplitude is increasing I don't know why. It should be constant. what's wrong?
Well if you have an equation of motion you should write it as an ordinary differential equation and solve it with a more ambitio...
10 days ago | 0
| accepted
Submitted
Varying Point-Spread-Function
This contribution allows the user to apply image-blurring with a spatially varying PSF, and Lucy-Richardson type de-blurring of ...
10 days ago | 2 downloads |
Axis not working with loglog
Simple reason: log10(0) is a very small "number". So that is an impossible request. Also when you set the axis limits before plo...
12 days ago | 1
| accepted
Scaling Multiple Subplots to the Same Scale
A usefult tool to utilize for this is linkaxes - that allows you to something like this: for i1 = 1:many sph(i1) = subplot...
16 days ago | 1
How can I create a break in the y-axis (looking like a flash; example below)?
There are several options on the File Exchange that claims to do exactly what you want. Have a look: FEX: break axis Tust a la...
17 days ago | 0
In a random distribution of points in square area how can we determine the density information of points in each region
So this is simply counting the number of points in each region. You can do this "by hand" region-by-region, something like this:...
17 days ago | 1
| accepted
How can I normalize images in matlab?
Once upon a time I had to make my own versions of histogram equalization because at that time that function in the image process...
17 days ago | 0
Submitted
contourinflectionpoints
contourinflectionpoints finds inflection-points on contour-lines
17 days ago | 12 downloads |
Can't call my function to another m file
If you have your third m-file in another directory and the first directory is not on the matlab-path then matlab will not know a...
18 days ago | 0
| accepted
Solve first-order ordinary differential equations
Your calculation of grad_xm and grad_ym looks peculiar to me. Since you seem to use x and y for the coordinates of Vm, it seems ...
19 days ago | 1
| accepted
Satellite Orbit, Friction Acceleration Function
Recently I've good experiences using this tool: RKN1210 - A 12th/10th order Runge-Kutta-Nyström integrator It is sightly differ...
20 days ago | 0
| accepted
How can I add a zoom in the peak of the curve ?
My prefered tool for this is: on-figure-magnifier - at the moment, my preferences vary since you can find a range of similar too...
22 days ago | 1
Is there a way to optimise following loop using 1:end notation?
You should get an identical fft in one step if you do this: E1mat = fft(A,[],1); Here the third argument is the dimension of A...
22 days ago | 0
how to describe this matlab function?
At the commandline prompt type this: dbstop in select1 Then call the function from the commandline: select1 That will open t...
23 days ago | 0
pcolorm ignores lines of data
The way I've understood pcolor (which I assume pcolorm is a modification of) makes a colour-patch with corners at [x(n,m),y(n,m...
23 days ago | 0
| accepted
Solving using an ode
You want to integrate your ode for a couple of values of s. To do that you can either create one ode-function for all 6 values o...
23 days ago | 0
Splines: How to find vector/array from smoothing line (function - csaps), or another function (still using a smoothing parameter)?
For that purpose I used something like this: y_smoothed = fnval(pp, x); If you check out the documentation for Spline postproc...
23 days ago | 1
| accepted
Submitted
contour_on_surf
3-D contour plot on a surface. Plot a contour on a 3-D surface, for example contour-plot of surface-temperature over a topograph...
24 days ago | 19 downloads |
Optimizing calculation in for loop for convolution
This should work: Hea = heaviside(x-tzero); % your shifted Heaviside sliding_gaussian=exp(-(x/sigma).^2); % Gaussian sliding_...
25 days ago | 0
Blackbody curve fitting to data
This looks uggly. Matlab impresses me in this case, in that it still manages to obtain some kind of result. The uggliest problem...
25 days ago | 0
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