title: ValueError: matmul: Input operand 1 has a mismatch in its core dimension 0, with gufunc signature (n?,k),(k,m?)->(n?,m?) (size 1 is different from 3)
body: <p>I have written code using matmul, but I am getting the following error: </p>
  
  <pre><code>   "ValueError: matmul: Input operand 1 has a mismatch in its core dimension 0, with gufunc signature (n?,k),(k,m?)-&gt;(n?,m?) (size 1 is different from 3)"
  </code></pre>
  
  <p>Code:</p>
  
  <pre><code>    R = [[0.40348195], [0.38658295], [0.82931052]]
      V = [0.33452744, 0.33823673, 0.32723583]
      print("Rt_p: ", R)
      B = np.matmul(V,np.transpose(R))/pow(LA.norm(R), 2)
      print("B", B)
  </code></pre>