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Given e.g.

  f := a[1]*a[2]+a[1]*a[3]+a[2]*a[3]

Now we want to substitute a[i]->i, I tried

   applyrule(a[i] = i, f)
   applyrule(a =[seq(i, i = 1 .. nops(a))], f)  

and replace "applyrule" above with "subs" and "algsubs" commands. But none works.

Any idea?

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up vote 2 down vote accepted

You could try something like

eval(f, a=[$1..3]);

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