There may have been a problem converting degrees to radian measure, however that is not required in MATLAB. Use trigonometric functions with the ‘d’ (sind, cosd, atan2d) to use degrees without having to convert them. Additionally, I use atan2d here, rather than atand. It seems to give the appropriate results.
Try this —
L_BC = 430; % mm
L_CA = 900; % mm
L_AA_prime = 100; % mm
theta_Anchor_range = linspace(127.2, 187.46, 1000);
L_AB = sqrt((L_AA_prime^2)+(L_BC^2)+(L_CA^2)+(2*L_BC*(L_CA*sind(theta_Anchor_range+180)))-L_AA_prime*cosd(theta_Anchor_range));
L_Stroke = L_AB - 580;
figure;
plot(theta_Anchor_range, L_Stroke);
xlabel('Theta Anchor (degrees)');
ylabel('L_Stroke (mm)');
title('Variation of L_AB with Theta BC');
grid on;
theta_AB = atan2d((L_CA+L_BC*sind(180+theta_Anchor_range)),(L_BC*cosd(180+theta_Anchor_range)-L_AA_prime));
figure;
plot(theta_Anchor_range, theta_AB);
grid
xlabel('Theta BC (degrees)');
ylabel('Theta AB (deg)');
% axis('equal')
EDIT — Corrected typographical errors.
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