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AlekseiKeymaster
Instead of
G=1/s+1
useG=fotf(1/s+1)
.AlekseiKeymasterPlease post the specific text of the error.
AlekseiKeymasterIt is included, but not supported in MATLAB R2010a.
Please see this comment: https://fomcon.net/fomcontoolbox/download/#comment1919AlekseiKeymasterI assume that you are using FOMCON.
Check whether the FOD library is on MATLAB path.
Also, which version of MATLAB are you using?AlekseiKeymasterPlease provide a particular example and/or screenshot. Which GUI are you referring to?
AlekseiKeymasterIt is likely that this is not a bug. For some systems the integral may indeed not converge. So, the result of computation of the norm depends on the system under investigation.
AlekseiKeymasterThis is a bug. Consider the following patch: https://fomcon.net/forums/topic/preliminaryreleasesandpatches/#post1037
Towards your second request, see the following PDF: http://www.abo.fi/~htoivone/courses/robust/rob2.pdfAlekseiKeymasterThis patch addresses the problem with the
norm()
function for thefotf
object: 0.41betapatch2015_01_09.zip
Put the folder inside the patch into the FOMCON root directory and overwrite the affected file. This reply was modified 7 years, 8 months ago by Aleksei.
AlekseiKeymasterYou may use
stepinfo()
on an approximated system. This function is not yet available for fotf systems.AlekseiKeymasterE.g., using the Oustaloup approximation method.
 This reply was modified 7 years, 10 months ago by Aleksei.
AlekseiKeymasterCRONE has several generations of controllers. Kindly see the book in https://fomcon.net/fo/overviewofliterature/ for details.
For instance, the first generation CRONE controller has the following form
\[
C(s)=C_0 s^{\alpha}\tag{1},
\]
with $\alpha, C_0\in\mathbb{R}$. This can be seen as one of the dynamical components of a fractionalorder PID controller, e.g., the integral component
\[
C_I(s)=K_i s^{\lambda},
\]
where $C_0=K_i$ and $\alpha=\lambda$ in (1).AlekseiKeymasterThere is no
optapp
function in FOMCON.AlekseiKeymasterI have answered this question in the comments on the main site.
AlekseiKeymasterThe function is named
oustafod
, notousta_fod
.AlekseiKeymasterAt some point I discovered an issue in FOMCON code related to classical PID controller tuning.
What I am currently getting is this. With $K=0.588205$, $L=67.379$, and $T=5054.34$ the tuning is $K_p=153.036$, $K_i=1.13563$, and $K_d=5155.69$.
 This reply was modified 7 years, 11 months ago by Aleksei.

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