Index exceeds the number of array elements (1).

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MALLIKARJUNA M
MALLIKARJUNA M am 31 Mär. 2023
Kommentiert: Cris LaPierre am 17 Apr. 2023
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

Akzeptierte Antwort

Cris LaPierre
Cris LaPierre am 31 Mär. 2023
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))
% ^
  3 Kommentare
Torsten
Torsten am 17 Apr. 2023
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
Cris LaPierre am 17 Apr. 2023
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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