Is there an error in the if else statement?

when I try to enter the code the system does not run, it all happened when I added the if else statment so whats wrong?

>> % Known Variables:

L1 = 16.87; %cm

L2 = 60.35;

L3 = 16.81;

L4 = 63.06;

L5 = 42.62;

L7 = 19.64;

theta_1 = 105.47; %degree

theta_3 = 270;

theta_5 = 115.38;

theta_triangle = ;

v = 2.95;

for t = 0 : 0.1 : 10;

LA= 29.71+ v*t;

%solving for theta 6(actuator) and theta7

Z = L5*exp(i*deg2rad(theta_5));

Zc = conj(Z);

A = L7*Zc;

B = Z*Zc +L7^2 -LA.^2;

C = L7*Z;

Q = (-B - sqrt(B^2 -4*A*C))/2*A;

Q_1 = (-B+ sqrt(B^2 -4*A*C))/2*A;

W= ((L7*Q)+Z)/LA;

W_1 = ((L7*Q_1)+Z)/LA;

theta_7 = rad2deg(angle(Q));

theta_7_1_ = rad2deg(angle(Q_1));

theta_6 = rad2deg(angle(W));

theta_6_1 = rad2deg(angle(W_1));

if theta_7>90

theta_7_Final =360-theta_7;

else if theta_7>-180

theta_7_Final =180-theta_7_1;

else theta_7_Final =180-theta_7_1;

theta_6_Final = 180+theta_6_1

theta_4_Final= theta_7_Final - theta_triangle

end

Answer 1

[Alan Stevens]

Yes, among others! See:

L1 = 16.87; %cm
L2 = 60.35;
L3 = 16.81;
L4 = 63.06;
L5 = 42.62;
L7 = 19.64;
theta_1 = 105.47; %degree 
theta_3 = 270;
theta_5 = 115.38;
theta_triangle =   100 ; %%%%%%%%%%%%%%%%%% You had no value here!
v = 2.95;
for t = 0 : 0.1 : 10
    LA= 29.71+ v*t;
    %solving for theta 6(actuator) and theta7
    Z = L5*exp(1i*deg2rad(theta_5));
    Zc = conj(Z);
    A = L7*Zc;
    B = Z*Zc +L7^2 -LA.^2;
    C = L7*Z;
    Q = (-B - sqrt(B^2 -4*A*C))/2*A;
    Q_1 = (-B+ sqrt(B^2 -4*A*C))/2*A;
    W= ((L7*Q)+Z)/LA;
    W_1 = ((L7*Q_1)+Z)/LA;
    theta_7 = rad2deg(angle(Q));
    theta_7_1 = rad2deg(angle(Q_1));   %%%%%%%%%%% You had theta_7_1_ here instead of theta_7_1
    theta_6 = rad2deg(angle(W));
    theta_6_1 = rad2deg(angle(W_1));
    if theta_7>90
        theta_7_Final =360-theta_7;
    elseif theta_7>-180                 %%%%%%%%%  elseif not else if
        theta_7_Final =180-theta_7_1;
    else
        theta_7_Final =180-theta_7_1;
        theta_6_Final = 180+theta_6_1;
        theta_4_Final= theta_7_Final - theta_triangle;
     end
end  %%%%%%%%%%%%% There was an end missing

[SK dawn]

thank you