Rotation in 3D

Suppose that we read into MATLAB the coordinates of a protein and we wish to rotate all the coordinates by 90 degrees along the Z axis to have a better side look at the protein, is the script in the next page correct?

Suppose that we read into MATLAB the coordinates of a protein and we wish to rotate all the coordinates by 90 degrees along the Z axis to have a better side look at the protein, is the script in the next page correct?