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Chebfun Team

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21 Dec 2014 Screenshot Chebfun Chebfun is an open-source package for numerical computation with functions to 15-digit accuracy Author: Chebfun Team approximation, interpolation, quadrature, integration, numerical analysis, ode 83 0
  • 5.0
5.0 | 2 ratings
24 Jun 2014 Screenshot Chebfun V4 Numerical computation with functions instead of numbers. Author: Chebfun Team numerical analysis, interpolation, approximation, spectral methods, differential equation..., chebfun 187 15
  • 4.88889
4.9 | 12 ratings
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27 Oct 2011 Chebfun V4 Numerical computation with functions instead of numbers. Author: Chebfun Team

Hi Jiro,

Thanks! We're currently in the process of moving to the new OOP system in our development release, which you can find on our website: http://www.maths.ox.ac.uk/chebfun/

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21 Nov 2014 Chebfun V4 Numerical computation with functions instead of numbers. Author: Chebfun Team Nick Hale

Hi Mehedi

I suggest you download the new version of Chebfun from here:

http://www.mathworks.com/matlabcentral/fileexchange/47023-chebfun

Regards

Nick

17 Nov 2014 Chebfun V4 Numerical computation with functions instead of numbers. Author: Chebfun Team Mehedi

Hello,
Great stuff! However, on 'guide - 7' this code segment does not work and gives the following error --

code :
L = chebop(@(x,u) diff(u,2),[0,pi]);
L.bc = 0;
[V,D] = eigs(L);
diag(D)
clf, plot(V(:,1:4))

error:
Error using horzcat
Dimensions of matrices being concatenated are not consistent.

Error in chebop/linearise (line 133)
dom = unique([dom domL domR domO]);

Error in chebop/linop (line 18)
[L bc isLin] = linearise(N,[],linCheck);

Error in chebop/eigs (line 44)
L = linop(N);

I would be happy if you can address this issue with a solution. Thanks in advance.

BR
Mehedi

25 Jun 2014 Chebfun Chebfun is an open-source package for numerical computation with functions to 15-digit accuracy Author: Chebfun Team Ehsan

21 Jun 2014 Chebfun Chebfun is an open-source package for numerical computation with functions to 15-digit accuracy Author: Chebfun Team Alex

23 Apr 2013 Chebfun V4 Numerical computation with functions instead of numbers. Author: Chebfun Team Nick Hale

Hi Jeff

Sorry for the delay in replying. In your first problem, you haven't quite the boundary condition syntax correct. The following should work:

L = chebop(@(x,u) diff(u,4), [0,1]);
B = chebop(@(x,u) sin(x) + 0*u, [0,1]);
L.lbc = @(u) [diff(u,2), diff(u,3)];
L.rbc = @(u) [diff(u,2), diff(u,3)];

The y''''(x)=lambda*f(x)*y(x) problem should be possible also. Try something like the following, where sin is replaced by the m-file you wish to use to construct f:

f = chebfun(@sin, [0, 1]);
[V, D] = eigs(L, diag(f), 4);

Regards

Nick

P.S. Emailing discuss@chebfun.org or help@chebfun.org should result in speedier replies! :)

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