# Confusion regarding "step value" of time in discrete time signals?

I am reading book"Signals and Systems Laboratory with Matlab" and i am studying about discrete time signals

I have also attached a snap and highlighted a line:

The definition of the time. For discrete-time signals, time is defined by using step 1

Does that means when we define a discrete time signal in MATLAB ,its increment/step should be "1"? Well that is the default case in MATLAB that if we define a time vector t=[0:5]; we will have values 0,1,2,3,4 and 5 and step/spacing between values will be "1"

So does that means that we can't have any value other than "1" as spacing/step?? • did the answer below help or are you still confused by this? Mar 8 at 4:51

This is also done for frequency, with the equivalent normalized units of frequency as cycles/sample instead of Hz or radians/sample instead of radians/sec. Both are achieved by dividing the frequency in Hz or rad/sec by the sampling rate (thus normalized). Thus the frequency axis when extending from DC to the sampling rate would extend from $$0$$ to $$1$$ in units of cycles/sample or from $$0$$ to $$2\pi$$ in units of radians/sample. Similarly if you multiply time by the sampling rate, you convert time in units of seconds to units of samples.