Allin,
First, thanks for all the goodies recently appeared in CVS.
Please apply the following. The fractional difference operator is
perfectly defined for |d| <= 1; the limiting case d=-1 corresponds to
cumulating a series. Fractionally differencing for d>1 can be accomplished
by "normal" differencing first for the integral part, and then applying
\Delta^d for the fractional part.
Index: lib/src/generate.c
===================================================================
RCS file: /cvsroot/gretl/gretl/lib/src/generate.c,v
retrieving revision 1.232
diff -u -r1.232 generate.c
--- lib/src/generate.c 29 Apr 2005 14:07:05 -0000 1.232
+++ lib/src/generate.c 2 May 2005 10:47:24 -0000
@@ -912,7 +912,7 @@
return NULL;
}
- if (*param < 0.0) { /* ?? */
+ if (fabs(*param) > 1.0) {
genr->err = 1;
return NULL;
}
Riccardo `Jack' Lucchetti
Dipartimento di Economia
Università di Ancona
jack(a)dea.unian.it
http://www.econ.unian.it/lucchetti
