I am reading the documentation of the spectrogram function and a do not understand a section in specific (Spectrogram and Instantaneous Frequency). The example provided in the documentation is the following:
Fs = 1000;t = 0:1/Fs:2-1/Fs;y = chirp(t,100,1,200,'quadratic');spectrogram(y,100,80,100,Fs,'yaxis')view(-77,72)shading interpcolorbar off
The obtained result is the attached image. In the x-axis, the frequency is displayed and z-axis time is displayed, what parameter is displayed in the y-axis?