71 lines
1.4 KiB
Matlab
71 lines
1.4 KiB
Matlab
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function D = A_times_B_kronecker_C(A,B,C)
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% Computes A * kron(B,C).
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%
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% INPUTS
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% A [double] mA*nA matrix.
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% B [double] mB*nB matrix.
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% C [double] mC*nC matrix.
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%
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% OUTPUTS
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% D [double] mA*(nC*nB) or mA*(nB*nB) matrix.
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%
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% ALGORITHM
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% none.
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%
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% SPECIAL REQUIREMENTS
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% none.
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%
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%
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% part of DYNARE, copyright Dynare Team (1996-2008)
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% Gnu Public License.
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% Chek number of inputs and outputs.
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if nargin>3 | nargin<2
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error('Two or Three input arguments required!')
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end
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if nargout>1
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error('Too many output arguments!')
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end
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% Get & check dimensions. Initialization of the output matrix.
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[mA,nA] = size(A);
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[mB,nB] = size(B);
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if nargin == 3
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[mC,nC] = size(C);
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if mB*mc ~= nA
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error('Input dimension error!')
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end
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D = zeros(mA,nB*nC);
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loop = (mB*nB*mC*nC > 1e7);
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else
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if mB*mB ~= nA
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error('Input dimension error!')
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end
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D = D = zeros(mA,nB*nB);
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loop = (mB*nB*mB*nB > 1e7);
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end
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% Computational part.
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if loop
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if nargin == 3
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k1 = 1;
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for i1=1:nB
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for i2=1:nC
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D(:,k1) = A * kron(B(:,i1),C(:,i2));
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k1 = k1 + 1;
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end
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end
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else
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k1 = 1;
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for i1=1:nB
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for i2=1:nB
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D(:,k1) = A * kron(B(:,i1),B(:,i2));
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k1 = k1 + 1;
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end
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end
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end
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else
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if nargin == 3
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D = A * kron(B,C);
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else
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D = A * kron(B,B);
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end
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end
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