MATLAB: Undefined function or variable ‘th14’

undefined functionundefined variable

hi, i am new in matlab i have a problem with finding 'th14' can u help me please? it say * 'Undefined function or variable 'th14''. *

for i=1:1:360

 th12=i/deg;  
 tth12(i)=th12; % tth12(i) indicates the i‟th element of the array. 
 th14=-1*(atan((0.08*cos(th12)-0.18-0.05*cos(th14))/(0.08*sin(th12)-0.05*sin(th14))));
 tth14(i)=th14;*

Best Answer

th14=-1*(atan((0.08*cos(th12)-0.18-0.05*cos(th14))/(0.08*sin(th12)-0.05*sin(th14))));

This is the line where th14 is defined, but the right hand side is attempting to use th14 which does not exist since it has not been defined yet.

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Not sure how you are getting the 'same value'. Your code as it is will not run in the first place.

Try this:

%case I
th1 = 0;
th2 = 0;
th3 = 0;
th4 = 0;
th5 = 0;
th6 = 0;
display('Case 1');
T1 = [cos(th1) 0 -sin(th1) 0; sin(th1) 0 -cos(th1) 0; 0 -1 0 0; 0 0 0 1];
T2 = [cos(th2) -sin(th2) 0 (260*cos(th2)); sin(th2) cos(th2) 0 (260*sin(th2)) ; 0 0 1 0; 0 0 0 1];
T3 = [cos(th3) 0 sin(th3) (-30*cos(th3)); sin(th3) 0 -cos(th3) (-30*sin(th3)) ; 0 1 0 0; 0 0 0 1];
T4 = [cos(th4) 0 sin(th4) 0; sin(th4) 0 -cos(th4) 0; 0 1 0 270; 0 0 0 1];
T5 = [cos(th5) 0 sin(th5) 0; sin(th5) 0 -cos(th5) 0; 0 1 0 0; 0 0 0 1];
T6 = [cos(th6) -sin(th6) 0 0; sin(th6) cos(th6) 0 0; 0 0 1 90; 0 0 0 1];
T = T1 * T2 * T3 * T4 * T5 * T6;
display(T);
%case II
th1 = pi/2;
th2 = 0;
th3 = pi;
th4 = 0;
th5 = 0;
th6 = 0;
display('Case 2');
T1 = [cos(th1) 0 -sin(th1) 0; sin(th1) 0 -cos(th1) 0; 0 -1 0 0; 0 0 0 1];
T2 = [cos(th2) -sin(th2) 0 (260*cos(th2)); sin(th2) cos(th2) 0 (260*sin(th2)) ; 0 0 1 0; 0 0 0 1];
T3 = [cos(th3) 0 sin(th3) (-30*cos(th3)); sin(th3) 0 -cos(th3) (-30*sin(th3)) ; 0 1 0 0; 0 0 0 1];
T4 = [cos(th4) 0 sin(th4) 0; sin(th4) 0 -cos(th4) 0; 0 1 0 270; 0 0 0 1];
T5 = [cos(th5) 0 sin(th5) 0; sin(th5) 0 -cos(th5) 0; 0 1 0 0; 0 0 0 1];
T6 = [cos(th6) -sin(th6) 0 0; sin(th6) cos(th6) 0 0; 0 0 1 90; 0 0 0 1];
T = T1 * T2 * T3 * T4 * T5 * T6;
display(T);

Works fine. If you want an optimized code and dont want to repeat the T1 to T6 equations, you can write them in a function and just call the function multiple times.

Best Answer

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