Community Profile

photo

Bjorn Gustavsson


UIT, the Arctic University of Norway

Last seen: Today Active since 2001

Statistics

All
  • Guiding Light
  • Revival Level 2
  • Solver
  • First Submission
  • Explorer
  • 24 Month Streak
  • 5-Star Galaxy Level 5
  • Knowledgeable Level 4
  • Personal Best Downloads Level 2
  • Editor's Pick
  • First Review
  • Thankful Level 1

View badges

Content Feed

Answered
How to write a code for plotting a Poincare map for the analysis of a double pendulum and also How to simulate the motion of the double pendulum.
You will find a couple of contributions on the file exchange for Poincare-maps, the first seems promising: FEX-hits on "poincare...

environ 3 heures ago | 0

Answered
area of water body in a grey color image
If the water-surface are flatter than the not-water-surfaces (seems reasonable assumption for standard optical satellite imaging...

1 jour ago | 0

Answered
solve a complex second order differential equation
The first step is to convert your second-order ODE to two coupled first-order ODEs: Then you should write that ODE-system as ...

2 jours ago | 0

| accepted

Answered
2D Minimization problem, not good for fminsearch?
For problems like these (It seems likely that your function has multiple local minima or at least very very flat regions) the be...

3 jours ago | 0

Answered
Error using * Incorrect dimensions
For problems like these you should learn to run the code line-by-line at the command-line prompt. Then check the size and type o...

3 jours ago | 0

Answered
Can someone please drop the code for ICA( independent component analysis) for image segmentation on matlab for classifying thermal images
Look on the file exchange for ICA-implementations: ICA at FEX Get fastICA from the/(a significant) source: FastICA Then the ma...

3 jours ago | 0

Answered
Integer eigenvalues in Matlab
Since you have a matrix and want the eigenvalues then the best approach seems to be to actually calculate the eigenvalues. For t...

7 jours ago | 0

Answered
How to solve simultaneous equations?
Using symbolic tools you have solve - look at the help and documentation for that function for examlpes. Your problem should red...

8 jours ago | 0

Answered
How to extract data from a function or functions. Also how to export this data to excel.
Your functions have their own name-space where the variables that are defined exists (in addition to the input variables that yo...

8 jours ago | 1

| accepted

Answered
how to Solve 4 Equation and 3 unknown
When you have four non-linear equations with three unknowns you cannot, in general, expect to get a symbolic solution. For these...

9 jours ago | 0

Answered
fitting data to system of ode
You will find the answer to this problem in a link to yet another answer (by Star Strider) here: fit-a-parameterised-ode-solutio...

9 jours ago | 0

| accepted

Answered
How to solve differential equations with varying constants
For the case you describe you have to add information about how X and p varies with time. Are they constant over some fixed inte...

10 jours ago | 0

Answered
What should go in a next-generation MATLAB X?
Allow elementary mathematical operations on function-handles. So instead of writing the sum of two functions as: f1 = @(x) x.^2...

10 jours ago | 0

Answered
Plotting spectrograms for multiple files
Wouldn't you achieve the desired output by putting the different spectrograms in consecutive subplots? Something like this perh...

16 jours ago | 0

Answered
How to define constraint in Optimization such that difference in value between two consecutive unknowns is not greater than 50%
Perhaps a constraint-function like this would get the job done (might be used with fmincon for example): function [c,ceq] = you...

16 jours ago | 0

Answered
Using fsolve to solve equation system for coefficients of a Schwartz-Christoffel map
You can use the optimization-functions to get a solution, or a hopefully good starting-point for fsolve. If you define a sum-of-...

16 jours ago | 1

Answered
Plot handle not being assigned
When you plot multiple lines plot returns an array of line-handles then it doesn't work to assign those to one element in h. For...

17 jours ago | 0

Answered
Solving a pair of equation using matlab
You have 2 unknown parameters k and theta. You have one condition for y at t=0 and one condition for dy/dt at t=0. Since you hav...

17 jours ago | 0

Answered
perpendicular and parallel component
You have to look at the documentation of the mission and the data access etc: MMS_Data_Access_f3. We cannot tell you how to hand...

23 jours ago | 0

Answered
topograph created by EEGLAB using ERP
For this you could do something like this (except I will use random data and plain imagesc): I_peaks = rand(3,1); for i1 = 3:-...

24 jours ago | 0

Answered
Wrong distortion parameters in camera calibration
After quickly looking at the amount of distortion noticeable it seems pretty small - open the images in gimp (for example, comer...

25 jours ago | 0

| accepted

Answered
How to use one marker for looped plots in legend
To get full controll of legends use the graphics-handles that are returned from the plot-functions. Perhaps something like this:...

30 jours ago | 0

Answered
How to determine the coefficient from the argmin function ?
This is a standard minimization-problem, for that matlab has the fminsearch function (and possibly a couple more in the optimiza...

environ un mois ago | 0

| accepted

Answered
Roughness of 3D Surface
There are a number of hits returned when searching for "curvature" on the file exchange. The gptoolbox seems to have a bunch of ...

environ un mois ago | 0

| accepted

Answered
How to range array steps
Split into two sequences: x = [-1:-1:-32,32:-1:1]; HTH

environ un mois ago | 1

| accepted

Answered
How to implement Hermite spline in Simulink
There is a way to make blocks that wrap a matlab-function (matlab-functions-simulink_5), shouldn't that solve this task? HTH

environ un mois ago | 1

| accepted

Answered
Speed Up the for loop
A couple of suggestions: 0, check the time spent on different lines by running this script with smaller limits on j and i with ...

environ un mois ago | 1

Answered
Principal component regression, keeping variable names
Well the eigen-vectors will correspond to some linear combinations of your orignal variables. As such one eigenvector might for ...

environ un mois ago | 1

Answered
Solving coupled differential equations.
The first trick to try with these coupled integro-differential equations is to try to "differentiate away the integrals": whi...

environ un mois ago | 0

Answered
How can I obtain the Fourier Transformation as a product of matrices?
Have a look at the help and documentation for dftmtx. That function should return the discrete Fourier-transform matrix and give...

environ un mois ago | 0

Load more