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My 'For' sequence is giving me "Array indices must be positive integers or logical values."

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This is my code, can you tell me whats wrong with it, please?
a = 1;
pi = 3.14159265359;
b = (540/2)/1000; %mm
rho = 8960; %kg/m3
c = 385; % J/(K·kg)
k = 400; % W/(K·m)
alpha = k/(rho*c);
y = input('y = ');
t = input('t=');
for i= 0:100
x =((-1)^a(i))/((a(i)+(1/2))*pi)*e^(-(a(i)+(1/2))^2*pi^2*alpha*t/b^2)*cos(a(i)+(1/2))*pi*y/b
x1 = 2*x
end

Accepted Answer

Siyu Guo
Siyu Guo on 7 May 2018
Array index in MATLAB starts from 1 instead of 0.

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