MATLAB: The output is weird

Dear all,
I have a question here. Let me paste my code here and then I'll address my problem.
if true
  % code

    Rotz_theta = [cos(theta1), -sin(theta1), 0, 0;
      sin(theta1), cos(theta1), 0, 0;
      0, 0, 1, 0;
      0, 0, 0, 1];
     Rotx_pi =  [1, 0, 0, 0;
            0, cos(pi/2), -sin(pi/2), 0;
            0, sin(pi/2), cos(pi/2), 0;
            0, 0, 0, 1];
     H0_1 =   Rotz_theta * Rotx_pi
  end
And this is the output :
if true
  % code
  H0_1 =
    [ cos(theta1), -(4967757600021511*sin(theta1))/81129638414606681695789005144064,  
      sin(theta1), 0]
    [ sin(theta1),  (4967757600021511*cos(theta1))/81129638414606681695789005144064,    
      -cos(theta1), 0]
    [           0,                                                                1, 
     4967757600021511/81129638414606681695789005144064, 0]
    [           0,                                                                0,   
                0, 1]  end
May anyone help me to figure out what is happening here? i've tried to change the format to short, but it still give the same answer 🙁
Thank you in advance 🙂
Skali

Best Answer

Use the vpa function.
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