Sinusoidal response
in [Matlab]
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From: Faraz Afzal on 29 Jun 2010 06:33 "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0ceik$1i$1(a)fred.mathworks.com>... > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0adsu$p4n$1(a)fred.mathworks.com>... > > "Faraz Afzal" <farazafzal(a)gmail.com> wrote in message <i0a5rp$pf1$1(a)fred.mathworks.com>... > > > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i09sfp$qua$1(a)fred.mathworks.com>... > > > > I am only a second day user of matlab. How can I find the sinusoidal response of a system? I have a low pass filter for which I found the impulse response and step response by step(...) and impulse(...) functions respectively.But what is the way to find the sinusoidal response of the low pass filter? > > > > > > > > > Wow.. It makes me so happy when i See people asking intereting question and then loooking at the power of Matlab turn to it forever.. > > > > > > Here is the way to simulate ur response.. > > > u will use gensig command. > > > To generate a sine wave of > > > PERIOD = 3 sec, > > > DURATION = 10 sec > > > SAMPLED AT = 0.1 sec > > > Use this.. > > > [u,t] = gensig('sin',3,10,0.1) > > > > > > Once you achieved it use this to find response.. > > > lsim(sys,u,t) > > > > > > Let me know if it was help.. > > > > > > Regards, > > > Muhammad Faraz > > > > Thanks a lot for the info. But how can I apply this to the matrix that I have created. I have 2 x 2 matrix for the low pass filter nd i gave step of (a b c d) to find step response. What sud i do for sinusoidal response > > > Thanks once again. When I tried it out this was the result that i got .What could be the possible solution to this? > > >> [u.t]=gensig('sin',3,10,0.1) > > u = > > t: [101x1 double] > > >> sys=ss(1,2,3,0) > > a = > x1 > x1 1 > > > b = > u1 > x1 2 > > > c = > x1 > y1 3 > > > d = > u1 > y1 0 > > Continuous-time model. > >> z=lsim(sys,u,t) > ??? Undefined function or variable 't'. no no no... No dear Sreevaas,, go to the process step by step. follow the scheme. 1. Setup your A , B , C, and D matrices. 2. sys = ss(A,B,C,D) 3. [u,t]=gensig('sin',3,10,0.1) (There is comma between u and t but not a dot like u did in your code.).. 4. z=lsim(sys,u,t) 5 plot(z) Or if u literally got ur matrices A,B,C,D as 1,2,3,0 , then follow (copy paste): A = 1 B = 2 C = 3 D = 0 sys= ss(A,B,C,D) [u,t] = gensig('sin',2,10,0.01); z = lsim(sys,u,t) plot(z) You can change your sine wave by changing its parameters as i explained long time ago. Regards, Let me know if it works Muhammad Faraz
From: Sreevas on 1 Jul 2010 08:50 "Faraz Afzal" <farazafzal(a)gmail.com> wrote in message <i0ci50$gt6$1(a)fred.mathworks.com>... > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0ceik$1i$1(a)fred.mathworks.com>... > > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0adsu$p4n$1(a)fred.mathworks.com>... > > > "Faraz Afzal" <farazafzal(a)gmail.com> wrote in message <i0a5rp$pf1$1(a)fred.mathworks.com>... > > > > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i09sfp$qua$1(a)fred.mathworks.com>... > > > > > I am only a second day user of matlab. How can I find the sinusoidal response of a system? I have a low pass filter for which I found the impulse response and step response by step(...) and impulse(...) functions respectively.But what is the way to find the sinusoidal response of the low pass filter? > > > > > > > > > > > > Wow.. It makes me so happy when i See people asking intereting question and then loooking at the power of Matlab turn to it forever.. > > > > > > > > Here is the way to simulate ur response.. > > > > u will use gensig command. > > > > To generate a sine wave of > > > > PERIOD = 3 sec, > > > > DURATION = 10 sec > > > > SAMPLED AT = 0.1 sec > > > > Use this.. > > > > [u,t] = gensig('sin',3,10,0.1) > > > > > > > > Once you achieved it use this to find response.. > > > > lsim(sys,u,t) > > > > > > > > Let me know if it was help.. > > > > > > > > Regards, > > > > Muhammad Faraz > > > > > > Thanks a lot for the info. But how can I apply this to the matrix that I have created. I have 2 x 2 matrix for the low pass filter nd i gave step of (a b c d) to find step response. What sud i do for sinusoidal response > > > > > > Thanks once again. When I tried it out this was the result that i got .What could be the possible solution to this? > > > > >> [u.t]=gensig('sin',3,10,0.1) > > > > u = > > > > t: [101x1 double] > > > > >> sys=ss(1,2,3,0) > > > > a = > > x1 > > x1 1 > > > > > > b = > > u1 > > x1 2 > > > > > > c = > > x1 > > y1 3 > > > > > > d = > > u1 > > y1 0 > > > > Continuous-time model. > > >> z=lsim(sys,u,t) > > ??? Undefined function or variable 't'. > > no no no... No dear Sreevaas,, > go to the process step by step. follow the scheme. > > 1. Setup your A , B , C, and D matrices. > 2. sys = ss(A,B,C,D) > 3. [u,t]=gensig('sin',3,10,0.1) (There is comma between u and t but > not a dot like u did in your code.).. > 4. z=lsim(sys,u,t) > 5 plot(z) > > Or if u literally got ur matrices A,B,C,D as 1,2,3,0 , then follow (copy paste): > A = 1 > B = 2 > C = 3 > D = 0 > sys= ss(A,B,C,D) > [u,t] = gensig('sin',2,10,0.01); > z = lsim(sys,u,t) > plot(z) > > You can change your sine wave by changing its parameters as i explained long time ago. > Regards, > Let me know if it works > > Muhammad Faraz I hav one more doubt.How can i find the pulse response when I am using matrices?
From: Faraz Afzal on 1 Jul 2010 08:59 "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0i2u7$ov9$1(a)fred.mathworks.com>... > "Faraz Afzal" <farazafzal(a)gmail.com> wrote in message <i0ci50$gt6$1(a)fred.mathworks.com>... > > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0ceik$1i$1(a)fred.mathworks.com>... > > > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0adsu$p4n$1(a)fred.mathworks.com>... > > > > "Faraz Afzal" <farazafzal(a)gmail.com> wrote in message <i0a5rp$pf1$1(a)fred.mathworks.com>... > > > > > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i09sfp$qua$1(a)fred.mathworks.com>... > > > > > > I am only a second day user of matlab. How can I find the sinusoidal response of a system? I have a low pass filter for which I found the impulse response and step response by step(...) and impulse(...) functions respectively.But what is the way to find the sinusoidal response of the low pass filter? > > > > > > > > > > > > > > > Wow.. It makes me so happy when i See people asking intereting question and then loooking at the power of Matlab turn to it forever.. > > > > > > > > > > Here is the way to simulate ur response.. > > > > > u will use gensig command. > > > > > To generate a sine wave of > > > > > PERIOD = 3 sec, > > > > > DURATION = 10 sec > > > > > SAMPLED AT = 0.1 sec > > > > > Use this.. > > > > > [u,t] = gensig('sin',3,10,0.1) > > > > > > > > > > Once you achieved it use this to find response.. > > > > > lsim(sys,u,t) > > > > > > > > > > Let me know if it was help.. > > > > > > > > > > Regards, > > > > > Muhammad Faraz > > > > > > > > Thanks a lot for the info. But how can I apply this to the matrix that I have created. I have 2 x 2 matrix for the low pass filter nd i gave step of (a b c d) to find step response. What sud i do for sinusoidal response > > > > > > > > > Thanks once again. When I tried it out this was the result that i got .What could be the possible solution to this? > > > > > > >> [u.t]=gensig('sin',3,10,0.1) > > > > > > u = > > > > > > t: [101x1 double] > > > > > > >> sys=ss(1,2,3,0) > > > > > > a = > > > x1 > > > x1 1 > > > > > > > > > b = > > > u1 > > > x1 2 > > > > > > > > > c = > > > x1 > > > y1 3 > > > > > > > > > d = > > > u1 > > > y1 0 > > > > > > Continuous-time model. > > > >> z=lsim(sys,u,t) > > > ??? Undefined function or variable 't'. > > > > no no no... No dear Sreevaas,, > > go to the process step by step. follow the scheme. > > > > 1. Setup your A , B , C, and D matrices. > > 2. sys = ss(A,B,C,D) > > 3. [u,t]=gensig('sin',3,10,0.1) (There is comma between u and t but > > not a dot like u did in your code.).. > > 4. z=lsim(sys,u,t) > > 5 plot(z) > > > > Or if u literally got ur matrices A,B,C,D as 1,2,3,0 , then follow (copy paste): > > A = 1 > > B = 2 > > C = 3 > > D = 0 > > sys= ss(A,B,C,D) > > [u,t] = gensig('sin',2,10,0.01); > > z = lsim(sys,u,t) > > plot(z) > > > > You can change your sine wave by changing its parameters as i explained long time ago. > > Regards, > > Let me know if it works > > > > Muhammad Faraz > > I hav one more doubt.How can i find the pulse response when I am using matrices? :)) Sreevaas, YOur doubt comes too late.. for impulse use impulse(sys), for step response step(sys) I hope it helps, Regards, Muhammad Faraz
From: Sreevas on 1 Jul 2010 09:27
"Faraz Afzal" <farazafzal(a)gmail.com> wrote in message <i0i3eq$rgp$1(a)fred.mathworks.com>... > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0i2u7$ov9$1(a)fred.mathworks.com>... > > "Faraz Afzal" <farazafzal(a)gmail.com> wrote in message <i0ci50$gt6$1(a)fred.mathworks.com>... > > > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0ceik$1i$1(a)fred.mathworks.com>... > > > > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i0adsu$p4n$1(a)fred.mathworks.com>... > > > > > "Faraz Afzal" <farazafzal(a)gmail.com> wrote in message <i0a5rp$pf1$1(a)fred.mathworks.com>... > > > > > > "Sreevas " <mailsreevas(a)gmail.com> wrote in message <i09sfp$qua$1(a)fred.mathworks.com>... > > > > > > > I am only a second day user of matlab. How can I find the sinusoidal response of a system? I have a low pass filter for which I found the impulse response and step response by step(...) and impulse(...) functions respectively.But what is the way to find the sinusoidal response of the low pass filter? > > > > > > > > > > > > > > > > > > Wow.. It makes me so happy when i See people asking intereting question and then loooking at the power of Matlab turn to it forever.. > > > > > > > > > > > > Here is the way to simulate ur response.. > > > > > > u will use gensig command. > > > > > > To generate a sine wave of > > > > > > PERIOD = 3 sec, > > > > > > DURATION = 10 sec > > > > > > SAMPLED AT = 0.1 sec > > > > > > Use this.. > > > > > > [u,t] = gensig('sin',3,10,0.1) > > > > > > > > > > > > Once you achieved it use this to find response.. > > > > > > lsim(sys,u,t) > > > > > > > > > > > > Let me know if it was help.. > > > > > > > > > > > > Regards, > > > > > > Muhammad Faraz > > > > > > > > > > Thanks a lot for the info. But how can I apply this to the matrix that I have created. I have 2 x 2 matrix for the low pass filter nd i gave step of (a b c d) to find step response. What sud i do for sinusoidal response > > > > > > > > > > > > Thanks once again. When I tried it out this was the result that i got .What could be the possible solution to this? > > > > > > > > >> [u.t]=gensig('sin',3,10,0.1) > > > > > > > > u = > > > > > > > > t: [101x1 double] > > > > > > > > >> sys=ss(1,2,3,0) > > > > > > > > a = > > > > x1 > > > > x1 1 > > > > > > > > > > > > b = > > > > u1 > > > > x1 2 > > > > > > > > > > > > c = > > > > x1 > > > > y1 3 > > > > > > > > > > > > d = > > > > u1 > > > > y1 0 > > > > > > > > Continuous-time model. > > > > >> z=lsim(sys,u,t) > > > > ??? Undefined function or variable 't'. > > > > > > no no no... No dear Sreevaas,, > > > go to the process step by step. follow the scheme. > > > > > > 1. Setup your A , B , C, and D matrices. > > > 2. sys = ss(A,B,C,D) > > > 3. [u,t]=gensig('sin',3,10,0.1) (There is comma between u and t but > > > not a dot like u did in your code.).. > > > 4. z=lsim(sys,u,t) > > > 5 plot(z) > > > > > > Or if u literally got ur matrices A,B,C,D as 1,2,3,0 , then follow (copy paste): > > > A = 1 > > > B = 2 > > > C = 3 > > > D = 0 > > > sys= ss(A,B,C,D) > > > [u,t] = gensig('sin',2,10,0.01); > > > z = lsim(sys,u,t) > > > plot(z) > > > > > > You can change your sine wave by changing its parameters as i explained long time ago. > > > Regards, > > > Let me know if it works > > > > > > Muhammad Faraz > > > > I hav one more doubt.How can i find the pulse response when I am using matrices? > > > :)) Sreevaas, > > YOur doubt comes too late.. for impulse > use impulse(sys), > for step response > step(sys) > > I hope it helps, > Regards, > Muhammad Faraz i know impulse(sys) and step(sys)... What i asked was for pulse.I mean like a fn. u(t)-u(t-T).I can find the laplace nd all and then find response.But is there any easier way using some fn.? |