Signal response in Frequency Hz from angular frequency
have a look to this example: http://www.mathworks.com/matlabcentral/fileexchange/55822-low-pass-filtering

here you have a signal that can be represented/plot in both frequencies scales:

omegas_axis=[0:2*pi/L:2*pi-2*pi/L];%axis input signal
frec_axis=[0:fs/L:fs-fs/L];%axis input signal


the "omegas_axis" is the angluar frequency.

Hope this helps,

BTS.