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Hi!
Thank you for your answer. I have just tried your proposal but an error again appears:
error: invalid use of script D:\Users\108907\step.m in index expression
error: called from
state at line 20 column 1
And I need also to plot the response and to add initial conditions for x and y vectors
Any suggestion?
De: Doug Stewart [mailto:[hidden email]]
Enviado el: martes, 09 de enero de 2018 15:23
Para: Haro Larrode, Marta Emilia
CC: Help GNU Octave
Asunto: Re: help with code system response state space
On Tue, Jan 9, 2018 at 6:20 AM, Beginner1 <[hidden email]> wrote:
Hi!
I am a very beginner in Octave. I need your help in the following task:
I need to obtain and plot the step response of a system whose statespace
matrices are known and it can be represented by
xdot=A*x+B*u
y=C*x+D*u
For this purpose, I have written this code:
/%Statespace system parameters
w=314.159;
ki=1.5;
kp=5000;
A=[0 1 0 0 0 0; 0 0 1 0 0 0; 0 4*w^2 0 0 0 0;0 0 0 0 1 0;0 0 0 0 0 1;0 0 0
0 4*w^2 0];
B=[0 0 0 0 0 0; 0 0 0 0 0 0;0 0 1 0 1 0;0 0 0 0 0 0;0 0 0 0 0 0;0 0 0 1 0
1];
C=[2*(w^2)*ki 0 ki 0 ki*w 0;0 ki*w 0 2*(w^2)*ki 0 ki];
D=[1 0 kp 0 kp 0;0 1 0 kp 0 kp];
%Perform system simulation
stname = {'xd1', 'xd2', 'xd3','xq1','xq2','xq3'};
sys = ss (A, B,C,D,'stname', stname)
t=linspace(0,3,1000)
[y,t,x]=step(sys)
plot(t,y)
/
However, an error message is obtained at the console for the command
plot(t,y) saying that the dimensions of one of the plot arrays are not
correct.
Any suggestion?
Thanks
_______________________________________________
Helpoctave mailing list
[hidden email]
https://lists.gnu.org/mailman/listinfo/helpoctave


OS: Windows 7 professional copyright 2009 Service Pack 1
Octave version:
4.2.1
Control version: control 3.0.0
Kind regards
De: Doug Stewart [mailto:[hidden email]]
Enviado el: martes, 09 de enero de 2018 15:43
Para: Haro Larrode, Marta Emilia
CC: Help GNU Octave
Asunto: Re: help with code system response state space
On Tue, Jan 9, 2018 at 9:30 AM, Haro Larrode, Marta Emilia <[hidden email]> wrote:
Hi!
Thank you for your answer. I have just tried your proposal but an error again appears:
error: invalid use of script D:\Users\108907\step.m in index expression
error: called from
state at line 20 column 1
And I need also to plot the response and to add initial conditions for x and y vectors
I tried your code with step(sys) and it works for me.
What version of octave are you using?
what version of control do you have?
Any suggestion?
De: Doug Stewart [mailto:[hidden email]]
Enviado el: martes, 09 de enero de 2018 15:23
Para: Haro Larrode, Marta Emilia
CC: Help GNU Octave
Asunto: Re: help with code system response state space
On Tue, Jan 9, 2018 at 6:20 AM, Beginner1 <[hidden email]> wrote:
Hi!
I am a very beginner in Octave. I need your help in the following task:
I need to obtain and plot the step response of a system whose statespace
matrices are known and it can be represented by
xdot=A*x+B*u
y=C*x+D*u
For this purpose, I have written this code:
/%Statespace system parameters
w=314.159;
ki=1.5;
kp=5000;
A=[0 1 0 0 0 0; 0 0 1 0 0 0; 0 4*w^2 0 0 0 0;0 0 0 0 1 0;0 0 0 0 0 1;0 0 0
0 4*w^2 0];
B=[0 0 0 0 0 0; 0 0 0 0 0 0;0 0 1 0 1 0;0 0 0 0 0 0;0 0 0 0 0 0;0 0 0 1 0
1];
C=[2*(w^2)*ki 0 ki 0 ki*w 0;0 ki*w 0 2*(w^2)*ki 0 ki];
D=[1 0 kp 0 kp 0;0 1 0 kp 0 kp];
%Perform system simulation
stname = {'xd1', 'xd2', 'xd3','xq1','xq2','xq3'};
sys = ss (A, B,C,D,'stname', stname)
t=linspace(0,3,1000)
[y,t,x]=step(sys)
plot(t,y)
/
However, an error message is obtained at the console for the command
plot(t,y) saying that the dimensions of one of the plot arrays are not
correct.
Any suggestion?
Thanks

DAS
_______________________________________________
Helpoctave mailing list
[hidden email]
https://lists.gnu.org/mailman/listinfo/helpoctave

