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pamelats |
1.1 |
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* $Id: locatf.F,v 1.2 1996/05/24 10:56:52 jamie Exp $ |
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* |
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* $Log: locatf.F,v $ |
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* Revision 1.2 1996/05/24 10:56:52 jamie |
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* add locatr entry for consistency with wrup |
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* Revision 1.1.1.1 1996/02/15 17:48:49 mclareni |
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* Kernlib |
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* |
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* |
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#if !defined(CERNLIB_QMIBMVF) |
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*#include "kernnum/pilot.h" |
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* |
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* Name change (consistancy) |
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* |
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FUNCTION LOCATR(ARRAY,LENGTH,OBJECT) |
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DIMENSION ARRAY(*) |
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LOCATR=LOCATF(ARRAY,LENGTH,OBJECT) |
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END |
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FUNCTION LOCATF(ARRAY,LENGTH,OBJECT) |
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C BINARY SEARCH THRU 'ARRAY' TO FIND 'OBJECT' |
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C 'ARRAY' IS ASSUMED TO BE SORTED PRIOR TO CALL |
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C IF MATCH IS FOUND, FUNCTION RETURNS POSITION OF ELEMENT |
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C IF NO MATCH FOUND, FUNCTION GIVES NEGATIVE OF NEAREST ELEMENT |
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C SMALLER THAN OBJECT |
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C F. JAMES , SEPT.,1974 |
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DIMENSION ARRAY(2) |
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NABOVE = LENGTH + 1 |
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NBELOW = 0 |
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10 IF (NABOVE-NBELOW .LE. 1) GO TO 200 |
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MIDDLE = (NABOVE+NBELOW) / 2 |
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IF (OBJECT - ARRAY(MIDDLE)) 100, 180, 140 |
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100 NABOVE = MIDDLE |
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GO TO 10 |
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140 NBELOW = MIDDLE |
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GO TO 10 |
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180 LOCATF = MIDDLE |
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GO TO 300 |
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200 LOCATF = -NBELOW |
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300 RETURN |
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END |
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#endif |
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