i had problem to do the coding in matlab

[dmss]

how to make a coding for discrete-time periodic signal

s = cos ωn
ω = 2π/5

i had try this coding but was error

n = 0:10
ω = 2*pi/5
s = cos (ω*n);
plot (n,s) grid on;

 

[pancho_hideboo]

s = cos (ω*n);
plot (n,s) grid on;

s = cos (ω*n);
plot (n, s), grid on;

 

[dmss]

how about

to create a coding for

s = A^|n|, |A|<1

 

[pancho_hideboo]

how about
to create a coding for
s = A^|n|, |A|<1

n = 0:10;
s = A.^abs;

 

[dmss]

how to declare
the funtion of "|A|<1"
when i use
0<A<1
it was error

 

[pancho_hideboo]

>> A=0.3;
>> n=0:10;
>> s = A.^abs

s =

Columns 1 through 8

1.0000 0.3000 0.0900 0.0270 0.0081 0.0024 0.0007 0.0002

Columns 9 through 11

0.0001 0.0000 0.0000

>>