matlab error -> index must be a positive integer or logical.

Hi!! I am matlab beginner...

I don't know how to solve the problem.

I think it is integer problem....

function [x, y, z] = FDH(Dtheta1,Dtheta2,Dtheta3,Dtheta4,Dtheta5,Dtheta6)
theta1 =Dtheta1; 
theta2 =Dtheta2; 
theta3 =Dtheta3; 
theta4 =Dtheta4; 
theta5 =Dtheta5;
theta6 =Dtheta6;

l3 = 6.5;
l4 = 6.5;
l6 = 6.5;

H01 = [-sind(theta1) 0 cosd(theta1) 0;cosd(theta1) 0 sind(theta1) 0;0 1 0 0;0 0 0 1];
H12 = [sind(theta2) 0 sind(theta2) 0;-cosd(theta2) 0 sind(theta2) 0;0 -1 0 0;0 0 0 1];
H23 = [cosd(theta3) -sind(theta3) 0 l3*cosd(theta3);sind(theta3) cosd(theta3) 0 l3*sind(theta3);0 0 1 0;0 0 0 1];
H34 = [cosd(theta4) -sind(theta4) 0 l4*cosd(theta4);sind(theta4) cosd(theta4) 0 l4*sind(theta4);0 0 1 0;0 0 0 1];
H45 = [cosd(theta5) 0 sind(theta5) 0;sind(theta5) 0 -cosd(theta5) 0;0 1 0 0;0 0 0 1];
H56 = [cosd(theta6) -sind(theta6) 0 l6*cosd(theta6);sind(theta6) cosd(theta6) 0 l6*sind(theta6);0 0 1 0;0 0 0 1];
H6F = [0 0 -1 0;0 1 0 0;1 0 0 0;0 0 0 1];

H0F = H01 * H12 * H23 * H34 * H45 * H56 * H6F
x =H0F(0,3);
y =H0F(1,3);
z =H0F(3,3);

x,y,z -> Attempted to access H0F(0,3); index must be a positive integer or logical.

Answer 1

[Walter Roberson]

0 is not a valid index in MATLAB. MATLAB indices start at 1. You probably want

x = H0F(1,3);
y = H0F(2,3);
z = H0F(3,3);

Answer 2

[Mingug LEE]

Good !!!!! Thank you !!! It is easy ~