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annotate spdiagVariable.m @ 681:7368affc8f78 feature/poroelastic

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Add D2 variable periodic for second order.
author Martin Almquist <malmquist@stanford.edu>
date Wed, 07 Feb 2018 15:42:50 -0800
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7368affc8f78 Add D2 variable periodic for second order.
Martin Almquist <malmquist@stanford.edu>
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1 function A = spdiagVariable(a,i)
7368affc8f78 Add D2 variable periodic for second order.
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2 default_arg('i',0);
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3
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4 if isrow(a)
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5 a = a';
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6 end
7368affc8f78 Add D2 variable periodic for second order.
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7
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8 n = length(a)+abs(i);
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9
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10 if i > 0
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11 a = [sparse(i,1); a];
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12 elseif i < 0
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13 a = [a; sparse(abs(i),1)];
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14 end
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15
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16 A = spdiags(a,i,n,n);
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17 end