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**Content Feed**

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...

2 dagar ago | 0

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...

3 dagar ago | 0

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 ...

4 dagar ago | 0

| accepted

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...

5 dagar ago | 0

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...

5 dagar ago | 0

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...

5 dagar ago | 0

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...

9 dagar ago | 0

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...

10 dagar ago | 0

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...

10 dagar ago | 1

| accepted

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...

11 dagar ago | 0

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...

11 dagar ago | 0

| accepted

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...

12 dagar ago | 0

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...

12 dagar ago | 0

Plotting spectrograms for multiple files

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

18 dagar ago | 0

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...

18 dagar ago | 0

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-...

18 dagar ago | 1

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...

19 dagar ago | 0

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...

19 dagar ago | 0

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...

25 dagar ago | 0

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:-...

26 dagar ago | 0

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...

27 dagar ago | 0

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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:...

ungefär en månad ago | 0

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...

ungefär en månad ago | 0

| accepted

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 ...

ungefär en månad ago | 0

| accepted

How to range array steps

Split into two sequences: x = [-1:-1:-32,32:-1:1]; HTH

ungefär en månad ago | 1

| accepted

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

ungefär en månad ago | 1

| accepted

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 ...

ungefär en månad ago | 1

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 ...

ungefär en månad ago | 1

Solving coupled differential equations.

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

ungefär en månad ago | 0

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...

ungefär en månad ago | 0