Fix "index exceeds number of array elements"

Question

JAKE WISNIEWSKI 2021-9-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1456614-fix-index-exceeds-number-of-array-elements

评论： JAKE WISNIEWSKI 2021-9-20

%% THIS IS MY CODE TO Solve HW 4
%% Clear memory
close all
clear all
clc
%%Given length of link
%L1=ground L2=crank L3=coupler L4=output
L1=[6 7 3 8 8 5 6]
L1 = 1×7
     6     7     3     8     8     5     6
L2=[2 9 10 5 5 8 8]
L2 = 1×7
     2     9    10     5     5     8     8
L3=[7 3 6 7 8 8 8]
L3 = 1×7
     7     3     6     7     8     8     8
L4=[9 8 8 6 6 9 9]
L4 = 1×7
     9     8     8     6     6     9     9
theta_x=[30 85 45 25 75 15 25]
theta_x = 1×7
    30    85    45    25    75    15    25
xsize=7; %size of array
for i=1:xsize
    theta_2(i)=theta_x(i)
end
theta_2 = 30
theta_2 = 1×2
    30    85
theta_2 = 1×3
    30    85    45
theta_2 = 1×4
    30    85    45    25
theta_2 = 1×5
    30    85    45    25    75
theta_2 = 1×6
    30    85    45    25    75    15
theta_2 = 1×7
    30    85    45    25    75    15    25
%%find theta angle
maxangle=90
maxangle = 90
for j=theta_x
    s(j)=L1(j)^2+L2(j)^2-2*L1(j)*L2(j)*cos(theta_2(j))
    mu(j)=acos((s(j)-L3(j)^2-L4(j)^2)/(-2*L3(j)*L4(j)));
    if (mu(j)>maxangle)
        mu(j)=mu(j)-90
    end
end
Index exceeds the number of array elements (7).

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Simon Chan 2021-9-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1456614-fix-index-exceeds-number-of-array-elements#answer_790879

在 MATLAB Online 中打开

j is going to be the index and hence theta_x should not be use

Try the following:

for j=1:length(theta_x)
    s(j)=L1(j)^2+L2(j)^2-2*L1(j)*L2(j)*cos(theta_2(j))
    mu(j)=acos((s(j)-L3(j)^2-L4(j)^2)/(-2*L3(j)*L4(j)));
    if (mu(j)>maxangle)
        mu(j)=mu(j)-90
    end
end