Changeset 1279:7caed393608e in lemon0.x
 Timestamp:
 03/31/05 10:34:55 (17 years ago)
 Branch:
 default
 Phase:
 public
 Convert:
 svn:c9d7d8f590d60310b91f818b3a526b0e/lemon/trunk@1711
 File:

 1 edited
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src/work/athos/lp/lp_base.h
r1275 r1279 35 35 ///Internal data structure to convert floating id's to fix one's 36 36 37 ///\todo This might b y implemented to beusable in other places.37 ///\todo This might be implemented to be also usable in other places. 38 38 class _FixId 39 39 { … … 171 171 }; 172 172 173 ///Linear expression 174 // typedef SparseLinExpr<Col> Expr; 173 ///Linear expression of variables and a constant component 174 175 ///This data structure strores a linear expression of the variables 176 ///(\ref Col "Col"s) and also has a constant component. 177 /// 178 ///There are several ways to access and modify the contents of this 179 ///container. 180 /// Its it fully compatible with \c std::map<Col,double>, so for expamle 181 ///if \c e is an Expr and \c v and \c w are of type \ref Col then you can 182 ///read and modify the coefficients like 183 ///these. 184 ///\code 185 ///e[v]=5; 186 ///e[v]+=12; 187 ///e.erase(v); 188 ///\endcode 189 ///or you can also iterate through its elements. 190 ///\code 191 ///double s=0; 192 ///for(LpSolverBase::Expr::iterator i=e.begin();i!=e.end();++i) 193 /// s+=i>second; 194 ///\endcode 195 ///(This code computes the sum of all coefficients). 196 /// Numbers (<tt>double</tt>'s) 197 ///and variables (\ref Col "Col"s) directly convert to an 198 ///\ref Expr and the usual linear operations are defined so 199 ///\code 200 ///v+w 201 ///2*v3.12*(vw/2)+2 202 ///v*2.1+(3*v+(v*12+w+6)*3)/2 203 ///\endcode 204 ///are valid expressions. The usual assignment operations are also defined. 205 ///\code 206 ///e=v+w; 207 ///e+=2*v3.12*(vw/2)+2; 208 ///e*=3.4; 209 ///e/=5; 210 ///\endcode 211 /// The constant member can be set and read by \ref constComp() 212 ///\code 213 ///e.constComp()=12; 214 ///double c=e.constComp(); 215 ///\endcode 216 /// 217 ///\note that \ref clear() not only sets all coefficients to 0 but also 218 ///clears the constant components. 175 219 class Expr : public std::map<Col,Value> 176 220 {
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