showing error " Array indices must be positive or logical values"

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Prasannakumar reddy
Prasannakumar reddy el 4 de Abr. de 2024 a las 14:11
Movida: VBBV el 5 de Abr. de 2024 a las 5:16
clc
clear all
N=2;
c=linspace(0.035,0.010,21)
r=linspace(0.0001,1,21)
thetaroot=15;
thetatip=4;
a=5.7
R=0.35;
theta=(thetaroot+(r.*(thetatip-thetaroot)))./57.3
sigma=(N.*c(i))./(pi.*R)
lambda=sigma.*a((sqrt(1+32.*theta.*r)./(sigma(i).*a))-1)
  1 comentario
VBBV
VBBV el 4 de Abr. de 2024 a las 15:10
Movida: VBBV el 5 de Abr. de 2024 a las 5:16
Ran in:
i & j are complex quantities in Matlab, if you use it as index without assigning any value to them would give such error, since Matlab uses 1 based positive integer indexing
clc
clear all
N=2;
c=linspace(0.035,0.010,21);
r=linspace(0.0001,1,21);
thetaroot=15;
thetatip=4;
a=5.7;
R=0.35;
theta=(thetaroot+(r.*(thetatip-thetaroot)))./57.3;
sigma=(N.*c)./(pi.*R) % i & j are complex quantities in Matlab
sigma = 1x21
0.0637 0.0614 0.0591 0.0568 0.0546 0.0523 0.0500 0.0477 0.0455 0.0432 0.0409 0.0387 0.0364 0.0341 0.0318 0.0296 0.0273 0.0250 0.0227 0.0205 0.0182
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lambda=sigma.*a((sqrt(1+32.*theta.*r)./(sigma.*a))-1) % same in this line
Array indices must be positive integers or logical values.

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Respuestas (2)

Torsten
Torsten el 4 de Abr. de 2024 a las 14:13
Editada: Torsten el 4 de Abr. de 2024 a las 14:15
lambda=sigma.*a.*((sqrt(1+32.*theta.*r)./(sigma(i).*a))-1)
instead of
lambda=sigma.*a((sqrt(1+32.*theta.*r)./(sigma(i).*a))-1)
And since "i" is undefined, c(i) and thus sigma(i) are empty.
  2 comentarios
Image Analyst
Image Analyst el 4 de Abr. de 2024 a las 14:27
If this Answer solves your original question, then could you please click the "Accept this answer" link to award the answerer with "reputation points" for their efforts in helping you? They'd appreciate it. Thanks in advance. 🙂 Note: you can only accept one answer (so pick the best one) but you can click the "Vote" icon for as many Answers as you want. Voting for an answer will also award reputation points.

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Image Analyst
Image Analyst el 4 de Abr. de 2024 a las 14:27
Movida: VBBV el 5 de Abr. de 2024 a las 5:16
See the FAQ for a thorough discussion of the error:
Subscript indices must either be real positive integers or logicals

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