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Math Help - Dot inflexion

  1. #1
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    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)
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  2. #2
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    Quote Originally Posted by walidfezzani View Post
    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
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  3. #3
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    I know the word in french, it's when f''(x)=0 : f is the representative function
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  4. #4
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    Quote Originally Posted by walidfezzani View Post
    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
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  5. #5
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    thanks

    Do you know please how can I find this dot of infection using Matlab, there's some function able to do that ?
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  6. #6
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    Quote Originally Posted by walidfezzani View Post
    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
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