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

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Prasannakumar reddy
Prasannakumar reddy 2024 年 4 月 4 日
移動済み: VBBV 2024 年 4 月 5 日
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)
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VBBV
VBBV 2024 年 4 月 4 日
移動済み: VBBV 2024 年 4 月 5 日
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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回答 (2 件)

Torsten
Torsten 2024 年 4 月 4 日
編集済み: Torsten 2024 年 4 月 4 日
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 件のコメント
Prasannakumar reddy
Prasannakumar reddy 2024 年 4 月 4 日
thanks it's working.
Image Analyst
Image Analyst 2024 年 4 月 4 日
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 2024 年 4 月 4 日
移動済み: VBBV 2024 年 4 月 5 日
See the FAQ for a thorough discussion of the error:

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