how to get transfer function for this problem?
21 views (last 30 days)
Show older comments
I am working on following .m file.
n1=1;d1=1;
n2=1;d2=[1 1];
n3=1;d3=[1 2];
n4=1;d4=[1 3];
n5=4;d5=1;
n6=8;d6=1;
n7=12;d7=1;
nblocks=7;
blkbuild
q=[2 1 -5 0 0;3 2 -6 0 0 ;4 2 -6 3 -7;5 3 0 0 0;6 3 0 0 0;7 4 0 0 0];
input=1; output=4;
[A, B, C, D]=connect(a,b,c,d,q,input,output);
[num,den]=ss2tf(A,B,C,D);
printsys(num,den,'s')
when I get the answer it looks like this:
num/den =
1.0658e-014 s^2 + 1 s + 3
--------------------------
s^3 + 26 s^2 + 179 s + 210
BUT I WANT IT TO LOOK LIKE THIS, HOW CAN I DO IT. THANKS.
num/den =
1 s + 3
--------------------------
s^3 + 26 s^2 + 179 s + 210
0 Comments
Accepted Answer
Azzi Abdelmalek
on 11 Oct 2012
you have just to remove the first coefficient from num
num=num(2:end)
model1=tf(num,den)
More Answers (1)
Udita Singh
on 9 Feb 2021
Edited: Walter Roberson
on 9 Feb 2021
blkbuild command is showing an error
how can i resolve this??
close all;
clear all;
n1=1; d1=1;
n2=1; d2=[1 1];
n3=1; d3=[1 2];
n4=1; d4=[1,3];
n5=4; d5=1;
n6=8; d6=1;
n7=12; d7=1;
input=1;
output=4;
nblocks=7;
blkbuild;
q=[2 1 -5 0 0
3 2 -6 0 0
4 3 -7 2 -6
5 3 0 0 0
6 3 0 0 0
7 4 0 0 0];
[aa,bb,cc,dd]=connect(a,b,c,d,q,input,output);
[n,d]=ss2tf(aa,bb,cc,dd);
printsys(n,d,'s')
2 Comments
Walter Roberson
on 9 Feb 2021
What error are you observing? It seems to execute without difficulty.
n1=1; d1=1;
n2=1; d2=[1 1];
n3=1; d3=[1 2];
n4=1; d4=[1,3];
n5=4; d5=1;
n6=8; d6=1;
n7=12; d7=1;
input=1;
output=4;
nblocks=7;
blkbuild;
q=[2 1 -5 0 0
3 2 -6 0 0
4 3 -7 2 -6
5 3 0 0 0
6 3 0 0 0
7 4 0 0 0];
[aa,bb,cc,dd]=connect(a,b,c,d,q,input,output);
[n,d]=ss2tf(aa,bb,cc,dd);
printsys(n,d,'s')
Udita Singh
on 9 Feb 2021
Edited: Udita Singh
on 9 Feb 2021
Actually its not its showing me error
can you pls help me because its working perfectly in online matlab
See Also
Categories
Find more on Simulink Functions in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!