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/*****************************************************************************
/
/ PORD Ordering Library: eval.h
/
/ author J"urgen Schulze, University of Paderborn
/ created 99mar30
/
/ This file contains the definition of various separator evaluation functions
/
******************************************************************************/
#define F eval1 /* default separator evaluation function */
/* --------------------------------------------------------------------- */
/* SEPARATOR EVALUATION FUNCTION 1 */
/* Size of domains W and B is allowed to differ TOLERANCE * 100 percent. */
/* Within this tolerance the difference is not penalized and only the */
/* size of the separator is returned. Additionally, the mantissa of the */
/* returned value is set to (max-min)/max. */
/* --------------------------------------------------------------------- */
#define TOL1 0.50 /* tolerated imbalance induced by bisector */
#define PEN1 100 /* penalty in case of higher imbalance */
#define eval1(S, B, W) \
S + PEN1 * max(0, max(W,B) * (1-TOL1) - min(W,B)) \
+ (FLOAT)(max(W,B)-min(W,B)) / (FLOAT)max(W,B)
/* --------------------------------------------------------------------- */
/* SEPARATOR EVALUATION FUNCTION 2 */
/* Ashcraft and Liu (Using domain decomposition to find graph bisectors) */
/* --------------------------------------------------------------------- */
#define alpha 0.1
#define TOL2 0.70
#define PEN2 100
#define eval2(S, B, W) \
S * (1 + alpha * ((FLOAT)max(W,B)/(FLOAT)max(1,min(W,B)))) \
+ PEN2 * max(0, max(W,B) * (1-TOL2) - min(W,B))
/* --------------------------------------------------------------------- */
/* SEPARATOR EVALUATION FUNCTION 3 */
/* Ashcraft and Liu (Generalized nested dissection:some recent progress) */
/* --------------------------------------------------------------------- */
#define alpha2 0.33
#define eval3(S, B, W) \
S * S + alpha2 * (max(W,B)-min(W,B)) * (max(W,B)-min(W,B))
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