How can i get the trigonometric function of cos and sin of a variable

Hello everyone, i am creating a program which consists, that you have to insert the value of Theta, alfa, d, and r.

The program can solve multiplication of arrays which the user introduce as a number, or as a variable

With the multiplication of arrays when the user introduce numbers i didnt have problems, but when the user introduces the value of theta, alfa, d and r, in variables i got stucked.

This is what i´v been trying

 if Art == 2
            fprintf('\n \n')
            T1 = input('      Introduce the value of Theta for row 1 = ',  's' )
            A1 = input('      Introduce the value of alfa  for row 1 = ',  's'')
            d1 = input('      Introduce the value of d for row 1 = ', 's' )
            r1 = input('      Introduce the value of r for row 1 = ', 's')
            M1 = [cos(T1) -sin(T1) 0 d1; cos(A1)*sin(T1) cos(A1)*cos(T1) -sin(A1) -r1*sin(A1); sin(A1)*sin(T1) sin(A1)*cos(T1) cos(A1) r1*cos(A1); 0 0 0 1]
            T2 = input('      Introduce the value of Theta for row 2 = ','s')
            A2 = input('      Introduce the value of alfa for row 2 = ', 's')
            d2 = input('      Introduce the value of d for row 2 = ', 's')
            r2 = input('      Introduce the value of r for row 2= ', 's')
            M2 = [cos(T2) -sin(T2) 0 d2; cos(A2)*sin(T2) cos(A2)*cos(T2) -sin(A2) -r2*sin(A2); sin(A2)*sin(T2) sin(A2)*cos(T2) cos(A2) r2*cos(A2); 0 0 0 1]
            pause(2)
            Res = M1*M2
            pause(3)
            disp('     See ya =)')
            break

Answer 1

[David Hill]

Why are the users not entering numbers instead of character arrays?

T1 = input('Introduce the value of Theta for row 1 = ');

[Arthur Ramirez]

Yeah, sorry, i pasted the parte when the user introduces the entering number, but i have already updated, the part when he has to introduce variables, but it´s not working yet

T1 = input(' Introduce the value of Theta for row 1 = ', 's' )

[David Hill]

I don't understand. What is the user entering?

[Arthur Ramirez]

There are 2 cases, the user decides how to solve, entering numbers, or with variables.

The part when the user decides to solve with numbers, i have it already. On the other hand, when the user decides to solve with variables, i do not know how to do it.

For example, let´s say the user introduces:

T1 = A

A1 = B

r1 = C

d1 = D

and then replace it in the array M1

M1 = [cos(T1) -sin(T1) 0 d1; cos(A1)*sin(T1) cos(A1)*cos(T1) -sin(A1) -r1*sin(A1); sin(A1)*sin(T1) sin(A1)*cos(T1) cos(A1) r1*cos(A1); 0 0 0 1]

So the same for M2

T2 = E

A2 = R

r2 = Q

d2 = P

M2 = [cos(T2) -sin(T2) 0 d2; cos(A2)*sin(T2) cos(A2)*cos(T2) -sin(A2) -r2*sin(A2); sin(A2)*sin(T2) sin(A2)*cos(T2) cos(A2) r2*cos(A2); 0 0 0 1]

and then show the result of the multiplication of M1 and M2

Res = M1*M2

[David Hill]

a = sym(input('      Introduce the value of Theta for row 1 = ',  's' ));
b = sym(input('      Introduce the value of alfa  for row 1 = ',  's'));
c = sym(input('      Introduce the value of d for row 1 = ', 's' ));
d = sys(input('      Introduce the value of r for row 1 = ', 's'));
e = sym(input('      Introduce the value of Theta for row 2 = ','s'));
r = sym(input('      Introduce the value of alfa for row 2 = ', 's'));
q = sym(input('      Introduce the value of d for row 2 = ', 's'));
p = sym(input('      Introduce the value of r for row 2= ', 's'));
m1=[cos(a),-sin(a),0,d;cos(b)*sin(a),cos(b)*cos(a),-sin(b),-c*sin(b);sin(b)*sin(a),sin(b)*cos(a),cos(b),c*cos(b);0,0,0,1];
m2=[cos(e),-sin(e),0,p;cos(r)*sin(e),cos(r)*cos(e),-sin(r),-q*sin(r);sin(r)*sin(e),sin(r)*cos(e),cos(r),q*cos(r);0,0,0,1];
Res=m1*m2;

[Arthur Ramirez]

Thanks for answering.

But what if the user does not introduce a,b,c,d instead introduces l,m,n,y.

[David Hill]

It will work no matter what the user introduces. Give it a try!

[Arthur Ramirez]

Actually it worked thank you so much David!

Have a great night!