Why am I getting the error "Array indices must be positive integers or logical values."?

Question

onur karakurt 2021-5-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/839690-why-am-i-getting-the-error-array-indices-must-be-positive-integers-or-logical-values

回答： Sulaymon Eshkabilov 2021-5-25

clear all;clc;
x=1;y=2
a=0.25   
k=2;n=5;
u=real(complex(k,n)+sqrt(complex(k,n).^2-4.*a.^2))
v=imag(complex(k,n)+sqrt(complex(k,n).^2-4.*a.^2))
kfinal=(x.*(u.*x-v.*y)-y(u.*y+v.*x))./(x.^2+y.^2)+a.^2.*(x.*(u.*x-v.*y)+y(u.*y+v.*x))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);
nfinal=(x.*(u.*y+v.*x)+y(u.*x-v.*y))./(x.^2+y.^2)+a.^2.*(x.*(u.*x+v.*y)-y(u.*x+v.*y))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);

Error :

Array indices must be positive integers or logical values.

Error in deneme (line 9)

kfinal=(x.*(u.*x-v.*y)-y(u.*y+v.*x))./(x.^2+y.^2)+a.^2.*(x.*(u.*x-v.*y)+y(u.*y+v.*x))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);

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Answer 1

Sulaymon Eshkabilov 2021-5-25

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/839690-why-am-i-getting-the-error-array-indices-must-be-positive-integers-or-logical-values#answer_708840

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Hi,

You have overlooked .* after y:

kfinal=(x.*(u.*x-v.*y)-y.*(u.*y+v.*x))./(x.^2+y.^2)+a.^2.*(x.*(u.*x-v.*y)+y.*(u.*y+v.*x))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);
nfinal=(x.*(u.*y+v.*x)+y.*(u.*x-v.*y))./(x.^2+y.^2)+a.^2.*(x.*(u.*x+v.*y)-y.*(u.*x+v.*y))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);