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annotate +sbp/diagInd.m @ 1031:2ef20d00b386 feature/advectionRV

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For easier comparison, return both the first order and residual viscosity when evaluating the residual. Add the first order and residual viscosity to the state of the RungekuttaRV time steppers
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Thu, 17 Jan 2019 10:25:06 +0100
parents 32b39dc44474
children
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32b39dc44474 Removed repository inside +sbp to make it part of the root repo.
Jonatan Werpers <jonatan@werpers.com>
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1 function A = diagInd(d,n,m)
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2 A = zeros(n,length(d));
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3 for i = 1:length(d)
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4 i0 = 1;
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5 j0 = d(i)+1;
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6
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7 I = i0 + (0:(n-1))';
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8 J = j0 + (0:(n-1))';
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9
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10 A(:,i) = matInd2VecInd(I,J,n);
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12 end
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13 end
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15 function I = matInd2VecInd(i,j,n)
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16 I = i + (j-1)*n;
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17 end