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how to set initial values to symbolic variable array?


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




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