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annotate subsSymfun.m @ 696:7c16b5af8d98 feature/quantumTriangles

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Add Jonatans symbolic lifehax
author Ylva Rydin <ylva.rydin@telia.com>
date Thu, 05 Oct 2017 18:04:23 +0200
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7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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1 % Subs for a symfun
7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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2 % f remains a symbolic function. If any of it's arguments is eliminated
7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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3 % it is removed from the argument list while preserving the order of the
7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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4 % other arguments
7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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5 function f = subsSymfun(f, old, new)
7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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6 args = argnames(f);
7c16b5af8d98 Add Jonatans symbolic lifehax
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7
7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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8 newExpr = subs(f, old, new);
7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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9 vars = symvar(subs(args, old, new));
7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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10
7c16b5af8d98 Add Jonatans symbolic lifehax
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11 newArgs = args(ismember(args,vars));
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12
7c16b5af8d98 Add Jonatans symbolic lifehax
Ylva Rydin <ylva.rydin@telia.com>
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13 f = symfun(newExpr, newArgs);
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Ylva Rydin <ylva.rydin@telia.com>
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14 end