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Topic: can an "array" start with an index other than 1?
Replies: 1   Last Post: Aug 31, 1996 3:01 AM

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Steve Sutlief

Posts: 2
Registered: 12/7/04
can an "array" start with an index other than 1?
Posted: Aug 25, 1996 5:59 PM
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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@radonc.washington.edu
--
Steve Sutlief, Ph.D. project: dynamic conformal radiation therapy
Radiation Oncology Dept. email: steve@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







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