Thread Subject: discrete-time signal

hi,
please , can anybody help me to write code and plot this signal?
Define the discrete-time signal x(n) = n u(n) in a vector in the range 0 ≤ n ≤ 10 and plot the signal.

thanks in advance

On 20 Mar, 13:29, "huda nawaf" <halmam...@yahoo.com> wrote:
> hi,
> please , can anybody help me to write code and plot this signal?
> Define the discrete-time signal x(n) = n u(n) in a vector in the range 0 ≤ n ≤ 10 and plot the signal.
>
> thanks in advance

doc plot
doc stem

Rune

Rune Allnor <allnor@tele.ntnu.no> wrote in message <50582939-bbdb-40e2-a07a-2e6e0a4053d2@t23g2000yqt.googlegroups.com>...
> On 20 Mar, 13:29, "huda nawaf" <halmam...@yahoo.com> wrote:
> > hi,
> > please , can anybody help me to write code and plot this signal?
> > Define the discrete-time signal x(n) = n u(n) in a vector in the range 0 ≤ n ≤ 10 and plot the signal.
> >
> > thanks in advance
>
> doc plot
> doc stem
>
> Rune
if you signal is step unity we can define it by u=ones(1,10)
n=[1 :10]
u=ones(1,10)
for n=1:10
uu(n)=n*u(n)
end
size(uu)
stem(uu)

Rune Allnor <allnor@tele.ntnu.no> wrote in message <50582939-bbdb-40e2-a07a-2e6e0a4053d2@t23g2000yqt.googlegroups.com>...
> On 20 Mar, 13:29, "huda nawaf" <halmam...@yahoo.com> wrote:
> > hi,
> > please , can anybody help me to write code and plot this signal?
> > Define the discrete-time signal x(n) = n u(n) in a vector in the range 0 ≤ n ≤ 10 and plot the signal.
> >
> > thanks in advance
>
> doc plot
> doc stem
>
> Rune

thanks, are you meaning , after I have got x , just plot(x)?

"RIKA fazi" <fazirika@yahoo.fr> wrote in message <ho2h28$knj$1@fred.mathworks.com>...
> Rune Allnor <allnor@tele.ntnu.no> wrote in message <50582939-bbdb-40e2-a07a-2e6e0a4053d2@t23g2000yqt.googlegroups.com>...
> > On 20 Mar, 13:29, "huda nawaf" <halmam...@yahoo.com> wrote:
> > > hi,
> > > please , can anybody help me to write code and plot this signal?
> > > Define the discrete-time signal x(n) = n u(n) in a vector in the range 0 ≤ n ≤ 10 and plot the signal.
> > >
> > > thanks in advance
> >
> > doc plot
> > doc stem
> >
> > Rune
> if you signal is step unity we can define it by u=ones(1,10)
> n=[1 :10]
> u=ones(1,10)
> for n=1:10
> uu(n)=n*u(n)
> end
> size(uu)
> stem(uu)
thank you very much , but, i think that unit step be 1 from any value =>0.

"RIKA fazi" <fazirika@yahoo.fr> wrote in message <ho2h28$knj$1@fred.mathworks.com>...
> Rune Allnor <allnor@tele.ntnu.no> wrote in message <50582939-bbdb-40e2-a07a-2e6e0a4053d2@t23g2000yqt.googlegroups.com>...
> > On 20 Mar, 13:29, "huda nawaf" <halmam...@yahoo.com> wrote:
> > > hi,
> > > please , can anybody help me to write code and plot this signal?
> > > Define the discrete-time signal x(n) = n u(n) in a vector in the range 0 ≤ n ≤ 10 and plot the signal.
> > >
> > > thanks in advance
> >
> > doc plot
> > doc stem
> >
> > Rune
> if you signal is step unity we can define it by u=ones(1,10)
> n=[1 :10]
> u=ones(1,10)
> for n=1:10
> uu(n)=n*u(n)
> end
> size(uu)
> stem(uu)

please friend, can you help too to resolve this question?

Write a MATLAB program to sketch the following discrete-time signals in the time range of –10 ≤ n ≤ 10. label all the graph axes clearly. If the sequence is complex, plot the magnitude and angle separately.
i. x(n) = u(n) – u(n – 3)
ii. x(n) = sin(πn/3) u(n)
iii. x(n) = 0.5n ejπn/2.
thank you very much

"huda nawaf" <halmamory@yahoo.com> wrote in message <ho65c3$gv9$1@fred.mathworks.com>...
> "RIKA fazi" <fazirika@yahoo.fr> wrote in message <ho2h28$knj$1@fred.mathworks.com>...
> > Rune Allnor <allnor@tele.ntnu.no> wrote in message <50582939-bbdb-40e2-a07a-2e6e0a4053d2@t23g2000yqt.googlegroups.com>...
> > > On 20 Mar, 13:29, "huda nawaf" <halmam...@yahoo.com> wrote:
> > > > hi,
> > > > please , can anybody help me to write code and plot this signal?
> > > > Define the discrete-time signal x(n) = n u(n) in a vector in the range 0 ≤ n ≤ 10 and plot the signal.
> > > >
> > > > thanks in advance
> > >
> > > doc plot
> > > doc stem
> > >
> > > Rune
> > if you signal is step unity we can define it by u=ones(1,10)
> > n=[1 :10]
> > u=ones(1,10)
> > for n=1:10
> > uu(n)=n*u(n)
> > end
> > size(uu)
> > stem(uu)
>
> please friend, can you help too to resolve this question?
>
> Write a MATLAB program to sketch the following discrete-time signals in the time range of –10 ≤ n ≤ 10. label all the graph axes clearly. If the sequence is complex, plot the magnitude and angle separately.
> i. x(n) = u(n) – u(n – 3)
> ii. x(n) = sin(πn/3) u(n)
> iii. x(n) = 0.5n ejπn/2.
> thank you very much

Huda, These are obvious homework problems. People generally do not just give people answers to their homework problems. Rune tried to politely make that point by just telling you to read the documentation. These are pretty simple operations in MATLAB if you would spend some time reading the documentation.

Wayne

huda nawaf wrote:

> please friend, can you help too to resolve this question?
>
> Write a MATLAB program to sketch the following discrete-time signals in
> the time range of –10 ≤ n ≤ 10. label all the graph
> axes clearly. If the sequence is complex, plot the magnitude and angle
> separately.
> i. x(n) = u(n) – u(n – 3)
> ii. x(n) = sin(πn/3) u(n)
> iii. x(n) = 0.5n ejπn/2.
> thank you very much

You might find the following thread from a couple of weeks ago to have
some useful ideas:

http://groups.google.ca/group/comp.soft-sys.matlab/browse_thread/thread/5bb8146b3df8c2aa/ca5a426685029efb