27 lines
1.0 KiB
C++
27 lines
1.0 KiB
C++
/*
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LA: linear algebra C++ interface library
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Copyright (C) 2008 Jiri Pittner <jiri.pittner@jh-inst.cas.cz> or <jiri@pittnerovi.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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template<typename T>
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const NRVec<T> inversepermutation(const NRVec<T> &p, const T offset=0)
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{
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int n=p.size();
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NRVec<T> q(n);
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if(!offset) for(int i=0; i<n; ++i) q[p[i]]=i;
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else for(int i=0; i<n; ++i) q[p[i]-offset]=i+offset;
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return q;
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}
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