1. ## Dot inflexion

Hi, I'd like to know please how to extract the "dot inflexion" from this program using Matlab software :

%Paramètres
Vin=24;R=10;L=1e-3;C=1e-6;T=1e-6;
c=[1 0;0 1];d=[0;0];
K=300;Vref=20;alpha=1.5e6
%Réponse indicielle
A=[0 -1/L;1/C -1/R/C]
B=[Vin/L;0]
C=[0 1]
D=0
[num,den]=SS2TF(A,B,C,D)
h=tf(num,den)
figure(1)
step(h,1e-3)

2. Originally Posted by walidfezzani
Hi, I'd like to know please how to extract the "dot inflexion" from this program using Matlab software :

%Paramètres
Vin=24;R=10;L=1e-3;C=1e-6;T=1e-6;
c=[1 0;0 1];d=[0;0];
K=300;Vref=20;alpha=1.5e6
%Réponse indicielle
A=[0 -1/L;1/C -1/R/C]
B=[Vin/L;0]
C=[0 1]
D=0
[num,den]=SS2TF(A,B,C,D)
h=tf(num,den)
figure(1)
step(h,1e-3)
What is "dot inflection"? h is a transfer function object.

RonL

3. I know the word in french, it's when f''(x)=0 : f is the representative function

4. Originally Posted by walidfezzani
I know the word in french, it's when f''(x)=0 : f is the representative function
That is a point of inflection in English.

RonL

5. ## thanks

Do you know please how can I find this dot of infection using Matlab, there's some function able to do that ?

6. Originally Posted by walidfezzani
Do you know please how can I find this dot of infection using Matlab, there's some function able to do that ?
I can't say, as I don't really know the fromat of transfer function objects
in Matlab, and I don't have a copy to experiment with at home, and my
licences at work don't cover the control toolbox, so even at work I may
not be able to try anything out.

RonL