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added 11 characters in body

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edited Jul 18, 2016 at 22:55

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y[n_] := Evaluate[(y[n] /. 
     RSolve[{y[n + 2] - y[n + 1] + 0.99*y[n] == ϕ[n], {y[0] == 0,
         y[1] == 1}}, y[n], n])[[1]]];

RSolve does not automatically Set the definition of y, so you need to assign it yourselfmanually. Also, the condition ϕ[0] == 0 in your RSolve is redundantseems to be unnecessary.

y[n_] := Evaluate[(y[n] /. 
     RSolve[{y[n + 2] - y[n + 1] + 0.99*y[n] == ϕ[n], {y[0] == 0,
         y[1] == 1}}, y[n], n])[[1]]];

RSolve does not automatically Set the definition of y, so you need to assign it yourself. Also, the condition ϕ[0] == 0 in your RSolve is redundant.

y[n_] := Evaluate[(y[n] /. 
     RSolve[{y[n + 2] - y[n + 1] + 0.99*y[n] == ϕ[n], {y[0] == 0,
         y[1] == 1}}, y[n], n])[[1]]];

RSolve does not automatically Set the definition of y, so you need to assign it manually. Also, the condition ϕ[0] == 0 in your RSolve seems to be unnecessary.

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created Jul 18, 2016 at 20:29

JungHwan Min

4.7k
1
23
36

y[n_] := Evaluate[(y[n] /. 
     RSolve[{y[n + 2] - y[n + 1] + 0.99*y[n] == ϕ[n], {y[0] == 0,
         y[1] == 1}}, y[n], n])[[1]]];

RSolve does not automatically Set the definition of y, so you need to assign it yourself. Also, the condition ϕ[0] == 0 in your RSolve is redundant.