Dot indexing is not supported for variables of this type. How to fix this?

[th3,th4,th5,r5] = NR(th1,th2(i),th3guess,th4guess,th5guess,r1,r2,r3,r4,r5guess);

J = [-r3.*sin(th3guess),-r4.*sin(th4guess),0,0;...
 r3.*cos(th3guess),r4.*cos(th4guess),0,0;...
 0,0,-r5guess.*sin(th5guess),cos(th5guess);...
 0,0,r5guess.*cos(th5guess),sin(th5guess)]; 
 
 dth = J\f;
th3guess = th3guess+dth(1);
th4guess = th4guess+dth(2);
th5guess = th5guess+dth(3);
 r5guess = r5guess+dth(4);
 
 
f = [-(r2 + r3.*cos(th3guess) - r4.*cos(th4guess));...
 -(0 + r3.*sin(th3guess) - r4.*sin(th4guess));...
 -(0 + r5guess.cos(th5guess) - 0);...   %<== error occurs here
 -(0 + r5guess.sin(th5guess) - 0)];


th3 = th3guess;
th4 = th4guess;
th5 = th5guess;
r5 = r5guess;

Answer 1

[Torsten]

r5guess.*cos(th5guess)
r5guess.*sin(th5guess)

instead of

r5guess.cos(th5guess)
r5guess.sin(th5guess)

[Bryan Tassin]

thx!

[Bryan Tassin]

I have one other question. The matrix seems to be working now, but the output numbers do not change, they remain constant. Do you know how to fix that?

[Torsten]

What do you mean by

the output numbers do not change, they remain constant

?

[Bryan Tassin]

I figured it out. The output was creating the same number for 360 iterations for each variable. Thanks for your help.

[Torsten]

J = [-r3.*sin(th3guess),r4.*sin(th4guess),0,0;...
    r3.*cos(th3guess),-r4.*cos(th4guess),0,0;...
    0,0,-r5guess.*sin(th5guess),cos(th5guess);...
    0,0,r5guess.*cos(th5guess),sin(th5guess)]; 

instead of

J = [-r3.*sin(th3guess),-r4.*sin(th4guess),0,0;...
    r3.*cos(th3guess),r4.*cos(th4guess),0,0;...
    0,0,-r5guess.*sin(th5guess),cos(th5guess);...
    0,0,r5guess.*cos(th5guess),sin(th5guess)];