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annotate +blockmatrix/fromMatrix.m @ 1037:2d7ba44340d0 feature/burgers1d

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Pass scheme specific parameters as cell array. This will enabale constructDiffOps to be more general. In addition, allow for schemes returning function handles as diffOps, which is currently how non-linear schemes such as Burgers1d are implemented.
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Fri, 18 Jan 2019 09:02:02 +0100
parents 3974dccff55b
children
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40dda96c8c9c blockmatrix: Added function to convert regular matrix to blockmatrix.
Jonatan Werpers <jonatan@werpers.com>
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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));
208
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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