instantaneous phase angle plots?

Hello, I'm struggling with this last part of an instantaneous phase angle plots.

I know how to get the phase angle

yh=hilbert(data);
amplitude=abs(yh);
phase=unwrap(angle(yh));

But I want to get the sawtooth plotting of phase angle(see link image for example).

I can't seem to figure out this last part. Any help? thank you.

extra question:

Also, why aren't the values of the phase angle normalized? that is, shouldn't they always go from pi to -pi? I have a noisy signal and the extrema of the phase angle plot range from 0.2 to 0.5

[vu ngothanh]

How can you do that. I want to do the same like you. Could you please to help me

Answer 1

[David]

ack! i just had to zscore normalize my signal! thankyou