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variable(): Avoid memory overhead of identity constructor.

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Bård Skaflestad 2013-04-30 12:48:02 +02:00
parent c276592ca5
commit 86eb29b4c3
1 changed files with 3 additions and 1 deletions
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4
AutoDiffVec.hpp
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@ -42,8 +42,10 @@ namespace AutoDiff
static ForwardVec variable(const V& val) static ForwardVec variable(const V& val)
{ {
ForwardVec ret(val); ForwardVec ret(val);
ret.jac_.reserve(Eigen::VectorXi::Constant(val.size(), 1));
for (typename M::Index row = 0; row < val.size(); ++row) { for (typename M::Index row = 0; row < val.size(); ++row) {
ret.jac_.insert(row, row) = 1.0; ret.jac_.insert(row, row) = Scalar(1.0);
} }
ret.jac_.makeCompressed(); ret.jac_.makeCompressed();
return ret; return ret;