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Re: Change multiplication operations into convolution


C1 F1[t] F2[t] + C2 F3[t] F4[t] F1[t] /. Times -> CircleTimes /.
  CircleTimes[a_?AtomQ, f__] :> a*CircleTimes[f]


Bob Hanlon

---- "Zhao wrote: 
> 
> If I want to change the multiplication operations  into convolution
> operations in an arbitrary function such as
> C1 F1[t] F2[t] + C2 F3[t] F4[t] F1[t],
> where Fi(t) represents functions of t and Ci represents constant, into
> C1 F1[t] * F2[t] + C2 F3[t] * F4[t] * F1[t], where "*" indicate
> convolution.
> 
> any good elegant way to do it? High appreciations!
> 
> Liang



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