m_set_P.c

/*
 Copyright (c) 2008 - Chris Buckley.

 Permission is granted for use and modification of this file for
 research, non-commercial purposes.
 */

#include "common.h"
#include "sysfunc.h"
#include "trec_eval.h"
#include "functions.h"
#include "trec_format.h"

static int
te_calc_set_P(const EPI *epi, const REL_INFO *rel_info, const RESULTS *results,
		const TREC_MEAS *tm, TREC_EVAL *eval);

/* See trec_eval.h for definition of TREC_MEAS */
TREC_MEAS te_meas_set_P =
		{ "set_P",
				"    Set Precision: num_relevant_retrieved / num_retrieved \n\
    Precision over all docs retrieved for a topic.\n\
    Was known as exact_prec in earlier versions of trec_eval\n\
    Note:   trec_eval -m P.50 ...\n\
    is different from \n\
            trec_eval -M 50 -m set_P ...\n\
    in that the latter will not fill in with nonrel docs if less than \n\
    50 docs retrieved\n",
				te_init_meas_s_float, te_calc_set_P, te_acc_meas_s,
				te_calc_avg_meas_s, te_print_single_meas_s_float,
				te_print_final_meas_s_float, NULL, -1 };

static int te_calc_set_P(const EPI *epi, const REL_INFO *rel_info,
		const RESULTS *results, const TREC_MEAS *tm, TREC_EVAL *eval) {
	RES_RELS res_rels;

	if (UNDEF == te_form_res_rels(epi, rel_info, results, &res_rels))
		return (UNDEF);

	if (res_rels.num_ret)
		eval->values[tm->eval_index].value = (double) res_rels.num_rel_ret
				/ (double) res_rels.num_ret;
	return (1);
}