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

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Arantxa Abascal 2018-5-7

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评论： Arantxa Abascal 2018-5-7

采纳的回答： Siyu Guo

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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

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per isakson 2018-5-7

编辑：per isakson 2018-5-7

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Replace

for i= 0:100

by

for ii = 0:100
    i = ii - 1;

And pi is already defined in Matlab

Arantxa Abascal 2018-5-7

Thanks, but it's still not working, i think there's something else wrong.

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采纳的回答

Siyu Guo 2018-5-7

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https://ww2.mathworks.cn/matlabcentral/answers/399420-my-for-sequence-is-giving-me-array-indices-must-be-positive-integers-or-logical-values#answer_318971

Array index in MATLAB starts from 1 instead of 0.

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Arantxa Abascal 2018-5-7

Thanks! I changed it but know it says " Index exceeds array bounds."

Arantxa Abascal 2018-5-7

Nevermind, that was it! thank you very much!!!!

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