Is there any one who can help me how to sum the following summation expression? I tried but it said to many inputs. Thank you for your help!
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Temesgen Gelaw
el 11 de Jun. de 2016
Comentada: Temesgen Gelaw
el 12 de Jun. de 2016
U(x,y) = ∑[∝.ϕ1(x) + β.ϕ2(x)].ψ(y), the summation is k : 0 --> infinity.
Where ψ(y)=sin(kπy), b=√(1/(2ϵ)^2 +(kπ)^2 ),
ϕ1(x)=e^(x/(2ϵ)) (sinh(b.(1-x)))/(sinh(b)),
ϕ2(x)=e^((x-1)/(2ϵ)).(sinh(b.x)/(sinh(b)),
∝=2/kπ (cos(0.45kπ) ),
β=∝.(b.e^(1/(2ϵ))/(sinh(b))⁄(1/2ϵ+b.(cosh(b)/sinh(b)))
3 comentarios
Image Analyst
el 11 de Jun. de 2016
But you must have overlooked Geoff's suggestion " the full error message" since I don't see the error message. You need to give ALL THE RED TEXT including lines numbers, line of code, etc.
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Roger Stafford
el 11 de Jun. de 2016
The first result with ‘symsum’ very likely indicates that ‘symsum’ is unable to compute this particular infinite sum.
The second result indicating too many input arguments refers to the ‘sum’ function. See:
http://www.mathworks.com/help/matlab/ref/sum.html
The ‘sum’ function is not symbolic but is numeric instead, and the arguments you gave, namely k,1,Inf, are inappropriate. You need to make ‘k’ a vector and unfortunately it has to be of finite length so you can only approximate an infinite sum with this method.
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