Re: how to set initial values to symbolic variable array?
- To: mathgroup at smc.vnet.net
- Subject: [mg129979] Re: how to set initial values to symbolic variable array?
- From: Bob Hanlon <hanlonr357 at gmail.com>
- Date: Thu, 28 Feb 2013 21:30:02 -0500 (EST)
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- References: <20130228044555.115C46877@smc.vnet.net>
Look up Pattern and Blank
f = Total[Array[a, 4]]
a[1] + a[2] + a[3] + a[4]
f /. a[_] -> 1
4
f /. a[n_] -> n
10
Bob Hanlon
On Wed, Feb 27, 2013 at 11:45 PM, Jon <devout1977 at gmail.com> wrote:
>
> 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
>
>
- References:
- how to set initial values to symbolic variable array?
- From: Jon <devout1977@gmail.com>
- how to set initial values to symbolic variable array?