Convert a complex mode shape to a real mode shape

This function converts a complex mode shape to a real mode shape

Obtained mode shapes from structural modal identification are in complex form. This function could be used to convert these complex mode shapes to real mode shapes.
Reference: Operational modal analysis of civil engineering structures pages 182 and 183.
Following commands could be used to run this code. Note that a complex mode shape is stored in the Example.mat file.
1) Load the example file:
load Example
2) Use the following command to convert the complex mode shape to real mode shape.
Real_Phi=ComplexModeToRealMode(Phi)