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how to set initial values to symbolic variable array?

• To: mathgroup at smc.vnet.net
• Subject: [mg129957] how to set initial values to symbolic variable array?
• From: Jon <devout1977 at gmail.com>
• Date: Wed, 27 Feb 2013 23:45:55 -0500 (EST)
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Dear All,

Suppose I defined a symbolic variable array as

Array[a,4]

and defined a function as

f = a[1] + a[2] + a[3] + a[4]

I need to evaluate the value of f in the following way,

f/.{a[1]->1,a[2]->1, ...}

but specify each element of the array one by one is very troublesome, and I
wonder whether there is something like a group definition like

f/.{a[1:4]->1}

to define the four variables at the same time with the same value.

Thanks for your help,

Sincerely,
John

• Follow-Ups:
  • Re: how to set initial values to symbolic variable array?
    • From: Bob Hanlon <hanlonr357@gmail.com>
  • Re: how to set initial values to symbolic variable array?
    • From: Tomas Garza <tgarza10@msn.com>
  • Re: how to set initial values to symbolic variable array?
    • From: Murray Eisenberg <murray@math.umass.edu>