Please help me with summation
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I would like to get t value
Please help me code this problem
Please see the attached
Given data
Left side (m1(t)/m1,inf = 1/2)
Right side (D1=3.6*10^-6, R= 0.15)
3 件のコメント
Jan
2021 年 4 月 21 日
As said already, I cannot read the text in the photo reliably. Please post it as text. What have you tried so far? You cannot include an infinite number of elements in a sum, because this would take infinite time to run. So are ayou sure, that the sum converges?
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David Hill
2021 年 4 月 21 日
編集済み: David Hill
2021 年 4 月 21 日
d=3.6e-6;r=.15;
n=1:1e6;%not quite infinate
eqn=@(t)24/pi^2*sum((1./(n-.5).^2).*exp(-(n-.5).^2*pi^2*d*t/r^2))-12.5;
T=fzero(eqn,-.0000000098);
2 件のコメント
David Hill
2021 年 4 月 21 日
It is the starting point to look for the zero crossing. You have to get close or else fzero will fail (goes to inf).
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