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)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net*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>