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/********************************************************************* |
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* * |
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* Copyright (c) 1997,1998, 1999 * |
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* Multimedia DB Group and DEIS - CSITE-CNR, * |
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* University of Bologna, Bologna, ITALY. * |
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* * |
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* All Rights Reserved. * |
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* * |
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* Permission to use, copy, and distribute this software and its * |
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* documentation for NON-COMMERCIAL purposes and without fee is * |
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* hereby granted provided that this copyright notice appears in * |
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* all copies. * |
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* * |
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* THE AUTHORS MAKE NO REPRESENTATIONS OR WARRANTIES ABOUT THE * |
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* SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING * |
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* BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, * |
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* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHOR * |
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* SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A * |
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* RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS * |
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* DERIVATIVES. * |
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* * |
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*********************************************************************/ |
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|
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#include "MT.h" |
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#include "MTpredicate.h" |
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#include "MTentry.h" |
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|
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extern dist2sim hfunction; |
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extern double distr[1001]; |
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|
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double Dist2Sim(double dist) { |
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switch(hfunction) { |
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case LINEAR: return 1-dist/maxDist(); |
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case EXPONENTIAL: return exp(-dist); |
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// case DISTR: return distr[(int)(dist*1001/maxDist())]; |
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default: return 0; |
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} |
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} |
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|
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double Sim2Dist(double sim) { |
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switch(hfunction) { |
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case LINEAR: return maxDist()*(1-sim); |
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case EXPONENTIAL: return -log(sim); |
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/* case DISTR: { |
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for(int i=0; distr[i]>=sim; i++); |
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return i*maxDist()/1001; |
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} */ |
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default: return maxDist(); |
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} |
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} |
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|
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int |
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SimpleQuery::Consistent(const GiSTentry& entry) |
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{ |
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assert(entry.IsA()==MTENTRY_CLASS); |
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// cout << "Evaluating " << entry; |
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if((grade==0)||(fabs(grade-((MTentry &)entry).Key()->distance)<=radius+((MTentry &)entry).maxradius())) { // prune for reference point |
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grade=pred->distance(((MTentry &)entry).object()); |
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return(grade<=radius+((MTentry &)entry).maxradius()); |
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} |
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else return FALSE; |
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} |
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|
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int |
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SimpleQuery::NonConsistent(const GiSTentry& entry) |
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{ |
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assert(entry.IsA()==MTENTRY_CLASS); |
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// cout << "Evaluating " << entry; |
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if((grade==0)||(fabs(grade-((MTentry &)entry).Key()->distance)>radius-((MTentry &)entry).maxradius())) { // prune for reference point |
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grade=pred->distance(((MTentry &)entry).object()); |
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return(grade>radius-((MTentry &)entry).maxradius()); |
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} |
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else return FALSE; |
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} |
