Fix "index exceeds number of array elements"

%% 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).

Answer 1

[Simon Chan]

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

[JAKE WISNIEWSKI]

That was correct. Thank you very much.