Answered
Minimizing the values in an underdetermined Matrix - minimize with constraints
*edit*: fixed mistake in call to |linprog| To perform L1 minimisation, you'll need access to an LP solver. If you have the op...

12 years ago | 0

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Answered
How to change selected data which would give me the line of best fit (R squared close to 1)?
For the first part x(logical(imag(x))) = nan; For the second, your data points are all over the show. Any two will fit a s...

12 years ago | 0

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Answered
Initializing vs growing a structure
Let's say you wanted to create a 100x1 struct array with a field |A| that you know will store a 3x3 matrix struct('A', repm...

12 years ago | 4

Answered
Minimizing the values in an underdetermined Matrix - minimize with constraints
Assuming you want a minimal Euclidean norm solution, there's no built-in function, but I can offer you a two-line solution: ...

12 years ago | 0

Answered
How to maximize this function: x1^2+x2^2+...+xn^2 ?
I assume you mean minimise rather than maximise, because unless you have |n| independent constraints, your problem is unbounded....

12 years ago | 0

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Can linprog give an integer value of x's?
No there isn't. Integer linear programming is a different beast. Perhaps this one from the file exchange might help: <http://...

12 years ago | 0

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Answered
How to output matlab ode dependent variable at same time step as T and Y?
By far the best way is to compute your dependent variable _afterwards_ with the |y| matrix that was computed by the ODE solver. ...

12 years ago | 1

12 years ago | 0

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how to construct an affinity matrix?
This might be helpful <http://www.mathworks.com/matlabcentral/fileexchange/26354-spectral-clustering-algorithms>

12 years ago | 0

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12 years ago | 0

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integration files
Mapping toolbox? <http://www.mathworks.com/products/mapping/>

12 years ago | 0

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reversible matrix operation
Your Laplacian matrix is not full rank. Because your system is consistent, you have multiple solutions, and you're just getting ...

12 years ago | 0

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reversible matrix operation
Your code doesn't run for me -- first, I don't have a function |avg| - did you mean to use |mean|? Second, if I replace all ...

12 years ago | 0

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difference between .01 and 0.01 in matlab?
Readability

12 years ago | 2

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if statement for range of array values
To check I've understood correctly, you only want to do something if the current and two preceding |x| values are all less than ...

12 years ago | 0

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Numerical methods with first order equations
ode45

12 years ago | 0

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Matrix fill-in when solving sparse linear systems
Firstly, is there any reason to believe that |x| should be sparse? Just because your matrix |A = C*C'| and your right hand sides...

12 years ago | 0

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Answered
Runge-Kutta method related
Why are you bothering to use |ode45| at all? Your solution for any |t >= ti| is just y = y0 + (t - ti) * (g*n-0.5*(u^2+v...

12 years ago | 1

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Answered
value of log(1000)
log10(1000)

12 years ago | 0

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Inserting zero rows and columns into matrix efficiently
Perhaps I'm misunderstanding, but your example can be generated from the following M = zeros(numel(pointer_master)); M(p...

12 years ago | 1

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Fixed point (matematice)
|xold| never gets updated, so |xnew| gets set to the same value every iteration, and the loop never ends ...

12 years ago | 0

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Answered
ode45
Yes, certainly possible. The basic approach would be to turn it into a system of first order odes of twice the dimension as foll...

12 years ago | 1

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Answered
Caught in loop
Your code works fine. If you remove the |disp| statement (which is causing it to slow down heaps), you'll find that it runs comp...

12 years ago | 1

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Triangular surface
Simple example using |DelaunayTri|. First create a set of points N = 1000; theta = 2*pi*rand(N, 1); phi = acos(2*rand...

12 years ago | 0

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Answered
[DISCONTINUED] Wish-list for MATLAB Answer sections.
Another thing that would be awesome would be the ability to submit a published m-file as an answer. Often I find myself answ...

12 years ago | 0

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Help with identifiny change in curve shape automatically
What I think you're looking for are effectively the points of high curvature. If you have access to the curve fitting toolbox th...

12 years ago | 1

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Answered
Need command help for a specific matrix operation
*EDIT* Needed to strain my eyes harder to figure out that the matrix in question had 4 rows C = [0 1 0 0; 0 0 1 0] * A.^2;

12 years ago | 1

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finding turning points of a dataset
Why don't you look for local maxima of curvature? This way you don't have to define any subjective tolerances. You may need to s...

12 years ago | 1

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signals addition
Assuming they correspond to the same sampling rates, truncate one of them to be of the same length as the smaller one: n1 =...

12 years ago | 0

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Answered
ODE45- How to pass parameters out
Why don't you just solve your ODE first, and then call the RHS function, modified to print out your parameters of interest, at t...

12 years ago | 1