Index exceeds the number of array elements (1).

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MALLIKARJUNA M 2023-3-31

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评论： Cris LaPierre 2023-4-17

I am trying to generate a graph for the analytical expression I got and I used for loop since my solution is in summation but i am getting the error

Index exceeds the number of array elements (1).

here is the expression, please help me to rectify the error

for n=0:1:N

d=a.*pi.*(-1).^n.*(2.*n + 1).*sin(sqrt(m./r).*(x - 1)).*exp(-(a + pi.^2.*(2.*n + 1).^2./4).*t)./(m.*(a.*r - m.*(r - 1)).*sin(sqrt(m./r))) - 2.*a.*(((-1).^n.*sin(n.*pi.*(x - 1))./(n(a.*r - n.^2.*pi.^2.*r.*(r - 1)).*cosh(sqrt(-n.^2.*pi.^2.*r + a))) - sin(n.*pi.*x)).*exp(-n.^2.*pi.^2.*r.*t) + (r - 1).*(2.*sin(sqrt(a./(r - 1)).*(x - 1))./sin(2.*sqrt(a./(r - 1))) - sin(sqrt(a./(r - 1)).*x)./sin(sqrt(a./(r - 1))) + cos(sqrt(a./(r - 1)).*x)./cos(sqrt(a./(r - 1)))).*exp(-a.*r.*t./(r - 1))./r)./pi;

end

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Answer 1

Cris LaPierre 2023-3-31

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在 MATLAB Online 中打开

I suspect the error is that you forgot to include a multiply in this statement after n

(n(a.*r - n.^2.*pi.^2.*r.*(r - 1))
% Should probably be
(n*(a.*r - n.^2.*pi.^2.*r.*(r - 1))
% ^

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MALLIKARJUNA M 2023-4-17

编辑：Torsten 2023-4-17

在 MATLAB Online 中打开

I have implemented your suggestion but i am getting blank sheet as the output

here the code

k=10;r=1;mu=1;x=1;t=1;
a=mu./1+k;
N=100;
for n=0:1:N
    d=a.*pi.*(-1).^n.*(2.*n + 1).*sin(sqrt(((a + pi.^2.*(2.*n + 1).^2)./4)./r).*(x - 1)).*exp(-(a + pi.^2.*(2.*n + 1).^2./4).*t)./(((a + pi.^2.*(2.*n + 1).^2)./4).*(a.*r - ((a + pi.^2.*(2.*n + 1).^2)./4).*(r - 1)).*sin(sqrt(((a + pi.^2.*(2.*n + 1).^2)./4)./r))) - 2.*a.*(((-1).^n.*sin(n.*pi.*(x - 1))./(n.*(a.*r - n.^2.*pi.^2.*r.*(r - 1)).*cosh(sqrt(-n.^2.*pi.^2.*r + a))) - sin(n.*pi.*x)).*exp(-n.^2.*pi.^2.*r.*t) + (r - 1).*(2.*sin(sqrt(a./(r - 1)).*(x - 1))./sin(2.*sqrt(a./(r - 1))) - sin(sqrt(a./(r - 1)).*x)./sin(sqrt(a./(r - 1))) + cos(sqrt(a./(r - 1)).*x)./cos(sqrt(a./(r - 1)))).*exp(-a.*r.*t./(r - 1))./r)./pi
end
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
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d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
d = NaN
v=(x./r)+(1-x-cosh(sqrt(a).*x)./(r.*cosh(sqrt(a))))+d
v = NaN

Torsten 2023-4-17

I'm getting NaN values when setting x = t = 1 (see above).

What are x and t in your case ?

Note that a=mu./1+k; is most probably wrong. I guess you wanted to set a=mu./(1+k);

I didn't look through the formula for d for similar errors.

Cris LaPierre 2023-4-17

We have to assume the code you have shared is accurate. We have no way of knowing what it should be.

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Index exceeds the number of array elements (1).

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Index exceeds the number of array elements (1).

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