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Re: How can I do this?


Hi Bill

You could use

a[t_]=Table[c[i, t],{i,n}]            (1)

or, with subscripts:

\!\(a[t_] = Table[c\_i[t], {i, n}]\)             (2)
(you can then avoid the c's and use a for the components as well:
   \!\(a[t_] = Table[a\_i[t], {i, n}]\)           (3)
)

Then you would define f[x_] this way:

f[x_,t_]:= Sum[a[t][[k]] p[k, x], {k, n}]    (all cases)

or

\!\(f[x_, t_] := \ Sum[c\_k[t]\ p[k, \ x], \ {k, \ n}]\)    (case 2)
 
or 

\!\(f[x_, t_] := \ Sum[a\_k[t]\ p[k, \ x], \ {k, \ n}]\)    (case 3)

(Paste all these expression into your Notebook. Then they will be
formatted by the front end.)

Yours sincerely
  Bruno


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