1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2006, 2008, 2009, 2010 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include <data/any-writer.h>
22 #include <data/case.h>
23 #include <data/casegrouper.h>
24 #include <data/casereader.h>
25 #include <data/casewriter.h>
26 #include <data/dictionary.h>
27 #include <data/file-handle-def.h>
28 #include <data/format.h>
29 #include <data/procedure.h>
30 #include <data/settings.h>
31 #include <data/subcase.h>
32 #include <data/sys-file-writer.h>
33 #include <data/variable.h>
34 #include <language/command.h>
35 #include <language/data-io/file-handle.h>
36 #include <language/lexer/lexer.h>
37 #include <language/lexer/variable-parser.h>
38 #include <language/stats/sort-criteria.h>
39 #include <libpspp/assertion.h>
40 #include <libpspp/message.h>
41 #include <libpspp/misc.h>
42 #include <libpspp/pool.h>
43 #include <libpspp/str.h>
44 #include <math/moments.h>
45 #include <math/sort.h>
46 #include <math/statistic.h>
47 #include <math/percentiles.h>
49 #include "aggregate.h"
55 #define _(msgid) gettext (msgid)
56 #define N_(msgid) msgid
58 /* Argument for AGGREGATE function. */
61 double f; /* Numeric. */
62 char *c; /* Short or long string. */
65 /* Specifies how to make an aggregate variable. */
68 struct agr_var *next; /* Next in list. */
70 /* Collected during parsing. */
71 const struct variable *src; /* Source variable. */
72 struct variable *dest; /* Target variable. */
73 int function; /* Function. */
74 enum mv_class exclude; /* Classes of missing values to exclude. */
75 union agr_argument arg[2]; /* Arguments. */
77 /* Accumulated during AGGREGATE execution. */
82 struct moments1 *moments;
85 struct variable *subject;
86 struct variable *weight;
87 struct casewriter *writer;
91 /* Attributes of aggregation functions. */
92 const struct agr_func agr_func_tab[] =
94 {"SUM", N_("Sum of values"), AGR_SV_YES, 0, -1, {FMT_F, 8, 2}},
95 {"MEAN", N_("Mean average"), AGR_SV_YES, 0, -1, {FMT_F, 8, 2}},
96 {"MEDIAN", N_("Median average"), AGR_SV_YES, 0, -1, {FMT_F, 8, 2}},
97 {"SD", N_("Standard deviation"), AGR_SV_YES, 0, -1, {FMT_F, 8, 2}},
98 {"MAX", N_("Maximum value"), AGR_SV_YES, 0, VAL_STRING, {-1, -1, -1}},
99 {"MIN", N_("Minimum value"), AGR_SV_YES, 0, VAL_STRING, {-1, -1, -1}},
100 {"PGT", N_("Percentage greater than"), AGR_SV_YES, 1, VAL_NUMERIC, {FMT_F, 5, 1}},
101 {"PLT", N_("Percentage less than"), AGR_SV_YES, 1, VAL_NUMERIC, {FMT_F, 5, 1}},
102 {"PIN", N_("Percentage included in range"), AGR_SV_YES, 2, VAL_NUMERIC, {FMT_F, 5, 1}},
103 {"POUT", N_("Percentage excluded from range"), AGR_SV_YES, 2, VAL_NUMERIC, {FMT_F, 5, 1}},
104 {"FGT", N_("Fraction greater than"), AGR_SV_YES, 1, VAL_NUMERIC, {FMT_F, 5, 3}},
105 {"FLT", N_("Fraction less than"), AGR_SV_YES, 1, VAL_NUMERIC, {FMT_F, 5, 3}},
106 {"FIN", N_("Fraction included in range"), AGR_SV_YES, 2, VAL_NUMERIC, {FMT_F, 5, 3}},
107 {"FOUT", N_("Fraction excluded from range"), AGR_SV_YES, 2, VAL_NUMERIC, {FMT_F, 5, 3}},
108 {"N", N_("Number of cases"), AGR_SV_NO, 0, VAL_NUMERIC, {FMT_F, 7, 0}},
109 {"NU", N_("Number of cases (unweighted)"), AGR_SV_OPT, 0, VAL_NUMERIC, {FMT_F, 7, 0}},
110 {"NMISS", N_("Number of missing values"), AGR_SV_YES, 0, VAL_NUMERIC, {FMT_F, 7, 0}},
111 {"NUMISS", N_("Number of missing values (unweighted)"), AGR_SV_YES, 0, VAL_NUMERIC, {FMT_F, 7, 0}},
112 {"FIRST", N_("First non-missing value"), AGR_SV_YES, 0, VAL_STRING, {-1, -1, -1}},
113 {"LAST", N_("Last non-missing value"), AGR_SV_YES, 0, VAL_STRING, {-1, -1, -1}},
114 {NULL, NULL, AGR_SV_NO, 0, -1, {-1, -1, -1}},
117 /* Missing value types. */
118 enum missing_treatment
120 ITEMWISE, /* Missing values item by item. */
121 COLUMNWISE /* Missing values column by column. */
124 /* An entire AGGREGATE procedure. */
127 /* Break variables. */
128 struct subcase sort; /* Sort criteria (break variables). */
129 const struct variable **break_vars; /* Break variables. */
130 size_t break_var_cnt; /* Number of break variables. */
132 enum missing_treatment missing; /* How to treat missing values. */
133 struct agr_var *agr_vars; /* First aggregate variable. */
134 struct dictionary *dict; /* Aggregate dictionary. */
135 const struct dictionary *src_dict; /* Dict of the source */
136 int case_cnt; /* Counts aggregated cases. */
138 bool add_variables; /* True iff the aggregated variables should
139 be appended to the existing dictionary */
142 static void initialize_aggregate_info (struct agr_proc *);
144 static void accumulate_aggregate_info (struct agr_proc *,
145 const struct ccase *);
147 static bool parse_aggregate_functions (struct lexer *, const struct dictionary *,
149 static void agr_destroy (struct agr_proc *);
150 static void dump_aggregate_info (const struct agr_proc *agr,
151 struct casewriter *output,
152 const struct ccase *break_case);
156 /* Parses and executes the AGGREGATE procedure. */
158 cmd_aggregate (struct lexer *lexer, struct dataset *ds)
160 struct dictionary *dict = dataset_dict (ds);
162 struct file_handle *out_file = NULL;
163 struct casereader *input = NULL, *group;
164 struct casegrouper *grouper;
165 struct casewriter *output = NULL;
167 bool copy_documents = false;
168 bool presorted = false;
172 memset(&agr, 0 , sizeof (agr));
173 agr.missing = ITEMWISE;
175 subcase_init_empty (&agr.sort);
177 /* OUTFILE subcommand must be first. */
178 lex_match (lexer, '/');
179 if (!lex_force_match_id (lexer, "OUTFILE"))
181 lex_match (lexer, '=');
182 if (!lex_match (lexer, '*'))
184 out_file = fh_parse (lexer, FH_REF_FILE | FH_REF_SCRATCH);
185 if (out_file == NULL)
189 if (out_file == NULL && lex_match_id (lexer, "MODE"))
191 lex_match (lexer, '=');
192 if (lex_match_id (lexer, "ADDVARIABLES"))
194 agr.add_variables = true;
196 /* presorted is assumed in ADDVARIABLES mode */
199 else if (lex_match_id (lexer, "REPLACE"))
201 agr.add_variables = false;
207 if ( agr.add_variables )
208 agr.dict = dict_clone (dict);
210 agr.dict = dict_create ();
212 dict_set_label (agr.dict, dict_get_label (dict));
213 dict_set_documents (agr.dict, dict_get_documents (dict));
215 /* Read most of the subcommands. */
218 lex_match (lexer, '/');
220 if (lex_match_id (lexer, "MISSING"))
222 lex_match (lexer, '=');
223 if (!lex_match_id (lexer, "COLUMNWISE"))
225 lex_error (lexer, _("expecting %s"), "COLUMNWISE");
228 agr.missing = COLUMNWISE;
230 else if (lex_match_id (lexer, "DOCUMENT"))
231 copy_documents = true;
232 else if (lex_match_id (lexer, "PRESORTED"))
234 else if (lex_force_match_id (lexer, "BREAK"))
238 lex_match (lexer, '=');
239 if (!parse_sort_criteria (lexer, dict, &agr.sort, &agr.break_vars,
242 agr.break_var_cnt = subcase_get_n_fields (&agr.sort);
244 if (! agr.add_variables)
245 for (i = 0; i < agr.break_var_cnt; i++)
246 dict_clone_var_assert (agr.dict, agr.break_vars[i]);
248 /* BREAK must follow the options. */
255 if (presorted && saw_direction)
256 msg (SW, _("When PRESORTED is specified, specifying sorting directions "
257 "with (A) or (D) has no effect. Output data will be sorted "
258 "the same way as the input data."));
260 /* Read in the aggregate functions. */
261 lex_match (lexer, '/');
262 if (!parse_aggregate_functions (lexer, dict, &agr))
265 /* Delete documents. */
267 dict_clear_documents (agr.dict);
269 /* Cancel SPLIT FILE. */
270 dict_set_split_vars (agr.dict, NULL, 0);
275 if (out_file == NULL)
277 /* The active file will be replaced by the aggregated data,
278 so TEMPORARY is moot. */
279 proc_cancel_temporary_transformations (ds);
280 proc_discard_output (ds);
281 output = autopaging_writer_create (dict_get_proto (agr.dict));
285 output = any_writer_open (out_file, agr.dict);
290 input = proc_open (ds);
291 if (!subcase_is_empty (&agr.sort) && !presorted)
293 input = sort_execute (input, &agr.sort);
294 subcase_clear (&agr.sort);
297 for (grouper = casegrouper_create_vars (input, agr.break_vars,
299 casegrouper_get_next_group (grouper, &group);
300 casereader_destroy (group))
302 struct casereader *placeholder = NULL;
303 struct ccase *c = casereader_peek (group, 0);
307 casereader_destroy (group);
311 initialize_aggregate_info (&agr);
313 if ( agr.add_variables )
314 placeholder = casereader_clone (group);
318 for (; (cg = casereader_read (group)) != NULL; case_unref (cg))
319 accumulate_aggregate_info (&agr, cg);
323 if (agr.add_variables)
326 for (; (cg = casereader_read (placeholder)) != NULL; case_unref (cg))
327 dump_aggregate_info (&agr, output, cg);
329 casereader_destroy (placeholder);
333 dump_aggregate_info (&agr, output, c);
337 if (!casegrouper_destroy (grouper))
340 if (!proc_commit (ds))
347 if (out_file == NULL)
349 struct casereader *next_input = casewriter_make_reader (output);
350 if (next_input == NULL)
353 proc_set_active_file (ds, next_input, agr.dict);
358 ok = casewriter_destroy (output);
371 casewriter_destroy (output);
374 return CMD_CASCADING_FAILURE;
377 /* Parse all the aggregate functions. */
379 parse_aggregate_functions (struct lexer *lexer, const struct dictionary *dict,
380 struct agr_proc *agr)
382 struct agr_var *tail; /* Tail of linked list starting at agr->vars. */
384 /* Parse everything. */
391 struct string function_name;
393 enum mv_class exclude;
394 const struct agr_func *function;
397 union agr_argument arg[2];
399 const struct variable **src;
412 ds_init_empty (&function_name);
414 /* Parse the list of target variables. */
415 while (!lex_match (lexer, '='))
417 size_t n_dest_prev = n_dest;
419 if (!parse_DATA_LIST_vars (lexer, &dest, &n_dest,
420 (PV_APPEND | PV_SINGLE | PV_NO_SCRATCH
424 /* Assign empty labels. */
428 dest_label = xnrealloc (dest_label, n_dest, sizeof *dest_label);
429 for (j = n_dest_prev; j < n_dest; j++)
430 dest_label[j] = NULL;
435 if (lex_is_string (lexer))
438 ds_init_string (&label, lex_tokstr (lexer));
440 ds_truncate (&label, 255);
441 dest_label[n_dest - 1] = ds_xstrdup (&label);
447 /* Get the name of the aggregation function. */
448 if (lex_token (lexer) != T_ID)
450 lex_error (lexer, _("expecting aggregation function"));
454 ds_assign_string (&function_name, lex_tokstr (lexer));
455 exclude = ds_chomp (&function_name, '.') ? MV_SYSTEM : MV_ANY;
457 for (function = agr_func_tab; function->name; function++)
458 if (!strcasecmp (function->name, ds_cstr (&function_name)))
460 if (NULL == function->name)
462 msg (SE, _("Unknown aggregation function %s."),
463 ds_cstr (&function_name));
466 ds_destroy (&function_name);
467 func_index = function - agr_func_tab;
470 /* Check for leading lparen. */
471 if (!lex_match (lexer, '('))
473 if (function->src_vars == AGR_SV_YES)
475 lex_force_match (lexer, '(');
481 /* Parse list of source variables. */
483 int pv_opts = PV_NO_SCRATCH;
485 if (func_index == SUM || func_index == MEAN || func_index == SD)
486 pv_opts |= PV_NUMERIC;
487 else if (function->n_args)
488 pv_opts |= PV_SAME_TYPE;
490 if (!parse_variables_const (lexer, dict, &src, &n_src, pv_opts))
494 /* Parse function arguments, for those functions that
495 require arguments. */
496 if (function->n_args != 0)
497 for (i = 0; i < function->n_args; i++)
501 lex_match (lexer, ',');
502 if (lex_is_string (lexer))
504 arg[i].c = ds_xstrdup (lex_tokstr (lexer));
507 else if (lex_is_number (lexer))
509 arg[i].f = lex_tokval (lexer);
514 msg (SE, _("Missing argument %zu to %s."),
515 i + 1, function->name);
521 if (type != var_get_type (src[0]))
523 msg (SE, _("Arguments to %s must be of same type as "
524 "source variables."),
530 /* Trailing rparen. */
531 if (!lex_force_match (lexer, ')'))
534 /* Now check that the number of source variables match
535 the number of target variables. If we check earlier
536 than this, the user can get very misleading error
537 message, i.e. `AGGREGATE x=SUM(y t).' will get this
538 error message when a proper message would be more
539 like `unknown variable t'. */
542 msg (SE, _("Number of source variables (%zu) does not match "
543 "number of target variables (%zu)."),
548 if ((func_index == PIN || func_index == POUT
549 || func_index == FIN || func_index == FOUT)
550 && (var_is_numeric (src[0])
551 ? arg[0].f > arg[1].f
552 : str_compare_rpad (arg[0].c, arg[1].c) > 0))
554 union agr_argument t = arg[0];
558 msg (SW, _("The value arguments passed to the %s function "
559 "are out-of-order. They will be treated as if "
560 "they had been specified in the correct order."),
565 /* Finally add these to the linked list of aggregation
567 for (i = 0; i < n_dest; i++)
569 struct agr_var *v = xzalloc (sizeof *v);
571 /* Add variable to chain. */
572 if (agr->agr_vars != NULL)
580 /* Create the target variable in the aggregate
583 struct variable *destvar;
585 v->function = func_index;
591 if (var_is_alpha (src[i]))
593 v->function |= FSTRING;
594 v->string = xmalloc (var_get_width (src[i]));
597 if (function->alpha_type == VAL_STRING)
598 destvar = dict_clone_var_as (agr->dict, v->src, dest[i]);
601 assert (var_is_numeric (v->src)
602 || function->alpha_type == VAL_NUMERIC);
603 destvar = dict_create_var (agr->dict, dest[i], 0);
607 if ((func_index == N || func_index == NMISS)
608 && dict_get_weight (dict) != NULL)
609 f = fmt_for_output (FMT_F, 8, 2);
611 f = function->format;
612 var_set_both_formats (destvar, &f);
618 destvar = dict_create_var (agr->dict, dest[i], 0);
621 if ((func_index == N || func_index == NMISS)
622 && dict_get_weight (dict) != NULL)
623 f = fmt_for_output (FMT_F, 8, 2);
625 f = function->format;
626 var_set_both_formats (destvar, &f);
632 msg (SE, _("Variable name %s is not unique within the "
633 "aggregate file dictionary, which contains "
634 "the aggregate variables and the break "
642 var_set_label (destvar, dest_label[i]);
647 v->exclude = exclude;
653 if (var_is_numeric (v->src))
654 for (j = 0; j < function->n_args; j++)
655 v->arg[j].f = arg[j].f;
657 for (j = 0; j < function->n_args; j++)
658 v->arg[j].c = xstrdup (arg[j].c);
662 if (src != NULL && var_is_alpha (src[0]))
663 for (i = 0; i < function->n_args; i++)
673 if (!lex_match (lexer, '/'))
675 if (lex_token (lexer) == '.')
678 lex_error (lexer, "expecting end of command");
684 ds_destroy (&function_name);
685 for (i = 0; i < n_dest; i++)
688 free (dest_label[i]);
694 if (src && n_src && var_is_alpha (src[0]))
695 for (i = 0; i < function->n_args; i++)
708 agr_destroy (struct agr_proc *agr)
710 struct agr_var *iter, *next;
712 subcase_destroy (&agr->sort);
713 free (agr->break_vars);
714 for (iter = agr->agr_vars; iter; iter = next)
718 if (iter->function & FSTRING)
723 n_args = agr_func_tab[iter->function & FUNC].n_args;
724 for (i = 0; i < n_args; i++)
725 free (iter->arg[i].c);
728 else if (iter->function == SD)
729 moments1_destroy (iter->moments);
731 dict_destroy_internal_var (iter->subject);
732 dict_destroy_internal_var (iter->weight);
736 if (agr->dict != NULL)
737 dict_destroy (agr->dict);
742 /* Accumulates aggregation data from the case INPUT. */
744 accumulate_aggregate_info (struct agr_proc *agr, const struct ccase *input)
746 struct agr_var *iter;
748 bool bad_warn = true;
750 weight = dict_get_case_weight (agr->src_dict, input, &bad_warn);
752 for (iter = agr->agr_vars; iter; iter = iter->next)
755 const union value *v = case_data (input, iter->src);
756 int src_width = var_get_width (iter->src);
758 if (var_is_value_missing (iter->src, v, iter->exclude))
760 switch (iter->function)
763 case NMISS | FSTRING:
764 iter->dbl[0] += weight;
767 case NUMISS | FSTRING:
771 iter->saw_missing = true;
775 /* This is horrible. There are too many possibilities. */
776 switch (iter->function)
779 iter->dbl[0] += v->f * weight;
783 iter->dbl[0] += v->f * weight;
784 iter->dbl[1] += weight;
791 cout = case_create (casewriter_get_proto (iter->writer));
793 case_data_rw (cout, iter->subject)->f
794 = case_data (input, iter->src)->f;
796 wv = dict_get_case_weight (agr->src_dict, input, NULL);
798 case_data_rw (cout, iter->weight)->f = wv;
802 casewriter_write (iter->writer, cout);
806 moments1_add (iter->moments, v->f, weight);
809 iter->dbl[0] = MAX (iter->dbl[0], v->f);
813 if (memcmp (iter->string, value_str (v, src_width), src_width) < 0)
814 memcpy (iter->string, value_str (v, src_width), src_width);
818 iter->dbl[0] = MIN (iter->dbl[0], v->f);
822 if (memcmp (iter->string, value_str (v, src_width), src_width) > 0)
823 memcpy (iter->string, value_str (v, src_width), src_width);
828 if (v->f > iter->arg[0].f)
829 iter->dbl[0] += weight;
830 iter->dbl[1] += weight;
834 if (memcmp (iter->arg[0].c,
835 value_str (v, src_width), src_width) < 0)
836 iter->dbl[0] += weight;
837 iter->dbl[1] += weight;
841 if (v->f < iter->arg[0].f)
842 iter->dbl[0] += weight;
843 iter->dbl[1] += weight;
847 if (memcmp (iter->arg[0].c,
848 value_str (v, src_width), src_width) > 0)
849 iter->dbl[0] += weight;
850 iter->dbl[1] += weight;
854 if (iter->arg[0].f <= v->f && v->f <= iter->arg[1].f)
855 iter->dbl[0] += weight;
856 iter->dbl[1] += weight;
860 if (memcmp (iter->arg[0].c,
861 value_str (v, src_width), src_width) <= 0
862 && memcmp (iter->arg[1].c,
863 value_str (v, src_width), src_width) >= 0)
864 iter->dbl[0] += weight;
865 iter->dbl[1] += weight;
869 if (iter->arg[0].f > v->f || v->f > iter->arg[1].f)
870 iter->dbl[0] += weight;
871 iter->dbl[1] += weight;
875 if (memcmp (iter->arg[0].c,
876 value_str (v, src_width), src_width) > 0
877 || memcmp (iter->arg[1].c,
878 value_str (v, src_width), src_width) < 0)
879 iter->dbl[0] += weight;
880 iter->dbl[1] += weight;
884 iter->dbl[0] += weight;
897 case FIRST | FSTRING:
900 memcpy (iter->string, value_str (v, src_width), src_width);
909 memcpy (iter->string, value_str (v, src_width), src_width);
913 case NMISS | FSTRING:
915 case NUMISS | FSTRING:
916 /* Our value is not missing or it would have been
917 caught earlier. Nothing to do. */
923 switch (iter->function)
926 iter->dbl[0] += weight;
937 /* Writes an aggregated record to OUTPUT. */
939 dump_aggregate_info (const struct agr_proc *agr, struct casewriter *output, const struct ccase *break_case)
941 struct ccase *c = case_create (dict_get_proto (agr->dict));
943 if ( agr->add_variables)
945 case_copy (c, 0, break_case, 0, dict_get_var_cnt (agr->src_dict));
952 for (i = 0; i < agr->break_var_cnt; i++)
954 const struct variable *v = agr->break_vars[i];
955 value_copy (case_data_rw_idx (c, value_idx),
956 case_data (break_case, v),
965 for (i = agr->agr_vars; i; i = i->next)
967 union value *v = case_data_rw (c, i->dest);
968 int width = var_get_width (i->dest);
970 if (agr->missing == COLUMNWISE && i->saw_missing
971 && (i->function & FUNC) != N && (i->function & FUNC) != NU
972 && (i->function & FUNC) != NMISS && (i->function & FUNC) != NUMISS)
974 value_set_missing (v, width);
975 casewriter_destroy (i->writer);
982 v->f = i->int1 ? i->dbl[0] : SYSMIS;
985 v->f = i->dbl[1] != 0.0 ? i->dbl[0] / i->dbl[1] : SYSMIS;
991 struct percentile *median = percentile_create (0.5, i->cc);
992 struct order_stats *os = &median->parent;
993 struct casereader *sorted_reader = casewriter_make_reader (i->writer);
996 order_stats_accumulate (&os, 1,
1001 i->dbl[0] = percentile_calculate (median, PC_HAVERAGE);
1002 statistic_destroy (&median->parent.parent);
1011 /* FIXME: we should use two passes. */
1012 moments1_calculate (i->moments, NULL, NULL, &variance,
1014 if (variance != SYSMIS)
1015 v->f = sqrt (variance);
1022 v->f = i->int1 ? i->dbl[0] : SYSMIS;
1027 memcpy (value_str_rw (v, width), i->string, width);
1029 value_set_missing (v, width);
1038 case FOUT | FSTRING:
1039 v->f = i->dbl[1] ? i->dbl[0] / i->dbl[1] : SYSMIS;
1048 case POUT | FSTRING:
1049 v->f = i->dbl[1] ? i->dbl[0] / i->dbl[1] * 100.0 : SYSMIS;
1061 v->f = i->int1 ? i->dbl[0] : SYSMIS;
1063 case FIRST | FSTRING:
1064 case LAST | FSTRING:
1066 memcpy (value_str_rw (v, width), i->string, width);
1068 value_set_missing (v, width);
1071 case NMISS | FSTRING:
1075 case NUMISS | FSTRING:
1084 casewriter_write (output, c);
1087 /* Resets the state for all the aggregate functions. */
1089 initialize_aggregate_info (struct agr_proc *agr)
1091 struct agr_var *iter;
1093 for (iter = agr->agr_vars; iter; iter = iter->next)
1095 iter->saw_missing = false;
1096 iter->dbl[0] = iter->dbl[1] = iter->dbl[2] = 0.0;
1097 iter->int1 = iter->int2 = 0;
1098 switch (iter->function)
1101 iter->dbl[0] = DBL_MAX;
1104 memset (iter->string, 255, var_get_width (iter->src));
1107 iter->dbl[0] = -DBL_MAX;
1110 memset (iter->string, 0, var_get_width (iter->src));
1114 struct caseproto *proto;
1115 struct subcase ordering;
1117 proto = caseproto_create ();
1118 proto = caseproto_add_width (proto, 0);
1119 proto = caseproto_add_width (proto, 0);
1121 if ( ! iter->subject)
1122 iter->subject = dict_create_internal_var (0, 0);
1124 if ( ! iter->weight)
1125 iter->weight = dict_create_internal_var (1, 0);
1127 subcase_init_var (&ordering, iter->subject, SC_ASCEND);
1128 iter->writer = sort_create_writer (&ordering, proto);
1129 subcase_destroy (&ordering);
1130 caseproto_unref (proto);
1136 if (iter->moments == NULL)
1137 iter->moments = moments1_create (MOMENT_VARIANCE);
1139 moments1_clear (iter->moments);