# Working out a summation for fitting a curve

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Hashim 2022년 8월 19일
댓글: Hashim 2022년 8월 20일
Hi, I want to work out a summation that goes as.
I want to fit this to a curve plotted as I on the y axis and t on the x axis using the curve fit app. My function for that goes as:
function I = CurveFitD(t, deltaQ, d)
%CurveFitD We want to fit the I(t)=f(t) to a custom function.
% For a bounded layer we have an expression which can yield us the
% thickness of the polymer layer (in centimeters). We have to fit the transient to this
% equation to calculate the layer thickness.
D = 1e-05;
% deltaQ = 4.2e-11; % Couloumbs
I = zeros(size(t));
for i = 1:length(t)
for k = 1:5
I(i) = I(i) + (-(1)^(k)).*...
(exp((-(k^2).*(d^2))))./(D*t(i));
end
I(i) = sqrt(1./t(i)).*(1+2.*I(i));
end
I = sqrt(D/(pi))*(deltaQ/d).*I;
end
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Hashim 2022년 8월 20일
Thanks everyone!

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