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annotate +util/semidiscrete2function.m @ 1217:a3d9567d9004 feature/d2_compatible

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Improve efficiency of construction of D2(b) by precomputing as much as possible
author Martin Almquist <malmquist@stanford.edu>
date Wed, 13 Nov 2019 14:54:22 -0800
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1 function F = semidiscrete2function(D,S)
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2 % TODO: Find threshhold when sparse makes sense.
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3 % TODO: Why does having the spase block slow down convergence.m (or does it?)
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4 if size(D,1) > 500
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5 D = sparse(D);
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6 end
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7
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8 if ~isa(S,'function_handle')
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9 F = @(w,t)(D*w + S);
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10 else
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11 F = @(w,t)(D*w + S(t));
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12 end
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13 end