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Add diffOp (currently scheme) for Divergence, not sure if this belongs in +scheme.
author Martin Almquist <malmquist@stanford.edu>
date Mon, 06 May 2019 21:23:21 -0700
parents e76321b89c1e
children
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function A = spdiag(a,i)
    default_arg('i',0);

    if isrow(a)
        a = a';
    end

    n = length(a)+abs(i);
    A = spdiags(a,i,n,n);
end