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view subsSymfun.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 489bea7fc33f
children
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% Subs for a symfun
% f remains a symbolic function. If any of it's arguments is eliminated
% it is removed from the argument list while preserving the order of the
% other arguments
function f = subsSymfun(f, old, new)
    args = argnames(f);

    newExpr = subs(f, old, new);
    vars = symvar(subs(args, old, new));

    newArgs = args(ismember(args,vars));

    f = symfun(newExpr, newArgs);
end