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ismember with vectors
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TOPIC: ismember with vectors
#6801
ismember with vectors 11 Months, 2 Weeks ago Karma: 0
My system has 4 inputs representing orthogonal components of two vectors. I want to restrict the inputs to a finite set of discrete vectors. I thought of using ismember, but I'm not sure how to make it access a set of vectors. Right now I have:
Code:

constraints = [constraints,  ismember(u(3:4,k), [...
        V2.*[cos((p1+p2)*thetar - 0); sin((p1+p2)*thetar - 0)],...
        V2.*[cos((p1+p2)*thetar - pi/3); sin((p1+p2)*thetar - pi/3)],...
        V2.*[cos((p1+p2)*thetar - 2*pi/3); sin((p1+p2)*thetar - 2*pi/3)],...
        V2.*[cos((p1+p2)*thetar - 3*pi/3); sin((p1+p2)*thetar - 3*pi/3)],...
        V2.*[cos((p1+p2)*thetar - 4*pi/3); sin((p1+p2)*thetar - 4*pi/3)],...
        V2.*[cos((p1+p2)*thetar - 5*pi/3); sin((p1+p2)*thetar - 5*pi/3)],...
        [0;0]])];


My error is :
Code:

??? Error using ==> sdpvar.le at 18
Error using ==> sdpvar.minus at 135
Matrix dimensions must agree.

Error in ==> sdpvar.ismember at 78
                 varargout{1} = [ varargout{1}, min(varargin{2}) <= varargin{1} <= max(varargin{2})];

Error in ==> yalmipMPDTC at 28
    constraints = [constraints,  ismember(u(3:4,k), [...


Thanks for the help!
abroekhof
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#6802
Re: ismember with vectors 11 Months, 2 Weeks ago Karma: 0
Great information
seaivanaion547
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#6804
Re: ismember with vectors 11 Months, 2 Weeks ago Karma: 32
Doesn't support matrix argument at the moment. Easily fixed (I'll do that), but until then you can simply use

ismember(u,A)

where A is a matrix with the different vectors as columns is equivalent to

d = binvar(size(A,2),1)
[u == A*d, sum(d)==1]
lofberg
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Last Edit: 2012/06/13 12:32 By lofberg.
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#6805
Re: ismember with vectors 11 Months, 2 Weeks ago Karma: 0
Perfect, thanks
abroekhof
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#6816
Re: ismember with vectors 11 Months, 1 Week ago Karma: 0
Great information
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