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annotate +blockmatrix/fromMatrix.m @ 1198:2924b3a9b921 feature/d2_compatible

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Add OpSet for fully compatible D2Variable, created from regular D2Variable by replacing d1 by first row of D1. Formal reduction by one order of accuracy at the boundary point.
author Martin Almquist <malmquist@stanford.edu>
date Fri, 16 Aug 2019 14:30:28 -0700
parents 3974dccff55b
children
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40dda96c8c9c blockmatrix: Added function to convert regular matrix to blockmatrix.
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1 function bm = fromMatrix(A, div)
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2 d1 = div{1};
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3 d2 = div{2};
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4 [n, m] = size(A);
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5 if n ~= sum(d1) || m ~= sum(d2)
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6 error('blockmatrix:fromMatrix:NonMatchingDim','The dimensions in div does not sum to the dimensions in A.');
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7 end
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8
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9 bm = cell(length(d1), length(d2));
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10 I = 1;
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11 for i = 1:length(d1)
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12 J = 1;
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13 for j = 1:length(d2)
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14 Asub = A(I:(I + d1(i)-1), J:(J + d2(j)-1));
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15 if nnz(Asub) == 0
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3974dccff55b Made block matrices created from a matrix always have matrix blocks, never empty.
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16 bm{i,j} = sparse(d1(i), d2(j));
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17 else
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18 bm{i,j} = Asub;
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19 end
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20 J = J + d2(j);
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21 end
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22 I = I + d1(i);
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23 end
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24 end