Phase difference of two graphs

Is there a function in MATLAB that will give me a value for the phase DIFFERENCE between two graphs. Also if I have created two signals and wish to change the phase between them how do I do that?

Answer 1

[Lokesh]

This might be helpful:

http://www.mathworks.com/matlabcentral/answers/91647-how-do-i-calculate-the-amplitude-ratio-and-phase-lag-for-two-sinusoidal-signals-in-matlab