Error returned in Eigs Function " Undefined operator '.*' "

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Wulfran Deberdt
Wulfran Deberdt 2018-9-17
回答： Wulfran Deberdt 2018-9-24
Hello !
I am working on the resolution of Orr-Sommerfeld equation and I used the code readable at https://www.mathworks.com/matlabcentral/mlc-downloads/downloads/submissions/23972/versions/22/previews/chebfun/examples/ode-eig/html/OrrSommerfeld.html .
However, it returns error. I ran line by line until finding the problem line, it is this one :
% e = eigs(A,B,50,'LR');
Which returns a triple error :
% Undefined operator '.*' for input arguments of type 'operatorBlock'.
%
% Error in @(x,u)(diff(u,4)-2.*diff(u,2)+u)./Re-2i.*u-1i.*diag(1-x.^2).*(diff(u,2)-u)
%
% Error in chebop/feval (line 190)
% out = N.op(x, u);
%
% Error in chebop/linearize (line 150)
% Nu = feval(N, x, u{:});
%
% Error in chebop/eigs (line 59)
% [L, ~, isLinear, u0] = linearize(N, N.init, [], linCheck);
Does anyone has an idea for the origin of these errors ?
Thanks.
Wulfran Deberdt, last semester's project at UC Berkeley

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回答（2 个）

Andrew Knyazev
Andrew Knyazev 2018-9-21
编辑：Walter Roberson 2018-9-21
Looks like a bug in chebfun - just make this comment at https://www.mathworks.com/matlabcentral/fileexchange/47023-chebfun-current-version for the chebfun authors to see and react.
Wulfran Deberdt
Wulfran Deberdt 2018-9-24
Thank you but I found the problem, just have to withdraw the built-in function "diag"

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