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

13 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 ...

13 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 ...

13 years ago | 0

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difference between .01 and 0.01 in matlab?
Readability

13 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 ...

13 years ago | 0

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Numerical methods with first order equations
ode45

13 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...

13 years ago | 0

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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...

13 years ago | 1

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Answered
value of log(1000)
log10(1000)

13 years ago | 0

Answered
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...

13 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 ...

13 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...

13 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...

13 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...

13 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...

13 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...

13 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;

13 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...

13 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 =...

13 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...

13 years ago | 1

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how to efficiently find the indices?
|sort| is your friend: First we sort the entries of |A| so that like entries are adjacent [S, iSorted] = sort(A(:)); ...

13 years ago | 3

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Answered
Matlab Help
"Use MATLAB to solve the following...." I've done it, now what do I get? Chocolate fish?

13 years ago | 0

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how to efficiently find the indices?
Depending on whether you want the first or the last occurence [uM, I] = unique(M, 'first') [uM, I] = unique(M)

13 years ago | 0

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Generation of a matrix
To give you some context, 9^275 = 2610298031214360458037978142613933577909126030175802622149530339319603934430500962487448801...

13 years ago | 0

Question

Licensing: Parallel Computing Toolbox labs vs independent MATLAB sessions
From a licensing perspective, what's the difference between running |n| independent MATLAB sessions and running |n| Parallel Com...

13 years ago | 2 answers | 0

2

answers

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matrix automation problem
This is one annoying case where the sparse version |spdiags| can do more than the full one |diag| n = 10; m = n-2; c1...

13 years ago | 0

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In an assignment A(I) = B, the number of elements in B and I must be the same - error using ode 45
Hi Peter Your code is actually fine (I just ran it). You must have something nasty hanging around to give that error (as Walt...

13 years ago | 0

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Finding lists of connected triangles in TriRep class
Why don't you want to define an adjacency matrix? If you do, then you could just use the |components| routine in MATLAB-BGL <...

13 years ago | 0

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kl transform
There's a demo in the file exchange <http://www.mathworks.com/matlabcentral/fileexchange/30678-image-compression-demo-usins-k...

13 years ago | 0

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Answered
Is deleting threads helpful in this forum?
My opinion is that a question can be deleted until it has been answered. Then it can't. Editors, and only editors, should be abl...

13 years ago | 2