Long-range Forecasting: From Crystal Ball to Computer by Jon Scott Armstrong

By Jon Scott Armstrong

Comprehensively overlaying all facets of long-range forecasting tools correct to the social, behavioral and administration sciences, this booklet is a synthesis of study in economics, sociology, psychology, transportation, schooling, and administration - with occasional references to paintings in medication, meterology, and expertise. It describes a number of forecasting equipment, their strengths and weaknesses, and the way to take advantage of them successfully, exhibits how you can constitution a forecasting challenge, and provides special systems for comparing forecasting types for you to opt for the ideal process for a selected challenge. The e-book attracts upon fabric from nearly 1300 books and articles, and comprises unique examine via the writer.

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Example 2-4. Concordance generator /* fb2-4 text concordance */ %option noyywrap nodefault yylineno case-insensitive /* the symbol table */ %{ struct symbol { char *name; struct ref *reflist; }; /* a word */ struct ref { struct ref *next; char *filename; int flags; int lineno; }; /* simple symtab of fixed size */ #define NHASH 9997 struct symbol symtab[NHASH]; struct symbol *lookup(char*); void addref(int, char*, char*,int); char *curfilename; /* name of current input file */ %} %% The %option line has two options we haven’t seen before, both of which are quite useful.

0. r) {fputs("out of space\n", stderr); abort(); } r->next = sp->reflist; r->filename = filename; r->lineno = lineno; r->flags = flags; sp->reflist = r; Next is addref, the routine called from inside the scanner to add a reference to a particular word; it’s implemented as a linked list of reference structures chained from the symbol. In order to make the report a little shorter, it doesn’t add a reference if the symbol already has a reference to the same line number and filename. Note that in this routine, we don’t make a copy of the filename, because we know that the caller handed us a string that won’t change.

Yyin = fopen(argv[1], "r"))) { perror(argv[1]); return (1); } } } yylex(); printf("%8d%8d%8d\n", lines, words, chars); The only differences from Example 1-1 are in the code in the third section. The main routine opens a filename passed on the command line, if the user specified one, and assigns the FILE to yyin. Otherwise, yyin is left unset, in which case yylex automatically sets it to stdin. File I/O in Flex Scanners | 23 The Flex Library Lex and flex have always come with a small library now known as -lfl that defines a default main routine, as well as a default version of yywrap, a wart left over from the earliest days of lex.

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