can an "array" start with an index other than 1?
- To: mathgroup at smc.vnet.net
- Subject: [mg4690] can an "array" start with an index other than 1?
- From: steve at gandalf.radonc.washington.edu (Steve Sutlief)
- Date: Sun, 25 Aug 1996 18:23:16 -0400
- Organization: University of Washington
- Sender: owner-wri-mathgroup at wolfram.com
I would like to have a multidimensional array with an index running
from -5 to 5, for example. Is there a kludge for doing this in
Mathematica?
I looked at the command $PreRead (and $Pre), but I could only think
of a way to use this for one dimensional arrays. For an array "b":
$PreRead = StringReplace[#, {"b[[" -> "b[[6+"}] &
The two kludges I could use in C won't work in Mathematica:
#include <stdio.h>
#define b(x) a[x+5]
main ()
{
int a[11] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20};
int i, *c = a+5;
for (i = -5; i < 6; i++)
printf("a[%2d] = %d, b(%2d) = %d, c[%2d] = %d\n",
i+5, a[i+5], i, b(i), i, c[i]);
return 0;
}
Steve Sutlief
steve at radonc.washington.edu
--
Steve Sutlief, Ph.D. project: dynamic conformal radiation therapy
Radiation Oncology Dept. email: steve at radonc.washington.edu
University of Washington office: (206) 548-6671
Box 356043 fax: (206) 548-6218
Seattle, Washington 98195-6043 web: http://weber.u.washington/~sutlief
==== [MESSAGE SEPARATOR] ====