<p dir="ltr">Thank you for your suggestion. However, I am not sure how I should formulate my Laplace domain equation. Could you please advise me more specifically?</p>
<p dir="ltr">Thanks.</p>
<div class="gmail_extra"><br><div class="gmail_quote">2016/09/25 午前9:33 "Tim Wescott [via Scilab / Xcos - Mailing Lists Archives]" <<a href="/user/SendEmail.jtp?type=node&node=4034620&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>>:<br type="attribution"><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

        I suggest that you roll your own cost function, and use optim.
<br><br>Where possible, with optim, if part of the problem is nonlinear and part 
<br>is linear, it's good to use a plain old linear least-squares fit for the 
<br>plain old linear part.  In your case, that's K.  Tau and Td will have to 
<br>be determined by optim.
<br><br>The cost function should generate a vector for ymodel with K = 1, then 
<br>find the best fit for K with
<br><br>K = y / ymodel;
<br><br>then return a cost
<br><br>cost = norm(y - K * ymodel);
<br><br>wrap that all up in NDCost and then optim, and away you'll go.
<br><br>On 2016-09-24 06:59, Fukashiimo wrote:
<div><div class='shrinkable-quote'><br>> Hello,
<br>> 
<br>> I am looking for a Scilab software which is similar to Matlab System ID 
<br>> tool
<br>> box.
<br>> 
<br>> I would like to obtain values of parameters, Tau, K and Td for 
<br>> following
<br>> first order delay + Dead time model from time series data.
<br>> ymodel = (K/(Tau*s+1))*exp(-Td*s)*u
<br>> ymodel: process output, u: process input
<br>> SISO continuous time
<br>> 
<br>> Object function: Min ( (y-ymodel)^2)
<br>> 
<br>> Could you please tell me which package I should use to solve this 
<br>> issue?
<br>> 
<br>> Best Regards,
<br>> 
<br>> 
<br>> 
<br>> --
<br>> View this message in context:
<br>> <a href="http://mailinglists.scilab.org/System-Identification-for-First-order-delay-and-dead-time-tp4034608.html" rel="nofollow" link="external" target="_blank">http://mailinglists.scilab.<wbr>org/System-Identification-for-<wbr>First-order-delay-and-dead-<wbr>time-tp4034608.html</a><br>> Sent from the Scilab users - Mailing Lists Archives mailing list
<br>> archive at Nabble.com.
<br>> ______________________________<wbr>_________________
<br>> users mailing list
<br>> <a href="http:///user/SendEmail.jtp?type=node&node=4034619&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>
<br>> <a href="http://lists.scilab.org/mailman/listinfo/users" rel="nofollow" link="external" target="_blank">http://lists.scilab.org/<wbr>mailman/listinfo/users</a></div></div>______________________________<wbr>_________________
<br>users mailing list
<br><a href="http:///user/SendEmail.jtp?type=node&node=4034619&i=1" rel="nofollow" link="external" target="_blank">[hidden email]</a>
<br><a href="http://lists.scilab.org/mailman/listinfo/users" rel="nofollow" link="external" target="_blank">http://lists.scilab.org/<wbr>mailman/listinfo/users</a><br>

        
        
        
        <br>
        <br>
        <hr noshade size="1" color="#cccccc">
        <div style="color:#444;font:12px tahoma,geneva,helvetica,arial,sans-serif">
                <div style="font-weight:bold">If you reply to this email, your message will be added to the discussion below:</div>
                <a href="http://mailinglists.scilab.org/System-Identification-for-First-order-delay-and-dead-time-tp4034608p4034619.html" target="_blank" rel="nofollow" link="external">http://mailinglists.scilab.<wbr>org/System-Identification-for-<wbr>First-order-delay-and-dead-<wbr>time-tp4034608p4034619.html</a>
        </div>
        <div style="color:#666;font:11px tahoma,geneva,helvetica,arial,sans-serif;margin-top:.4em;line-height:1.5em">
                
                To unsubscribe from System Identification for First order delay and dead time, <a href="" target="_blank" rel="nofollow" link="external">click here</a>.<br>
                <a href="http://mailinglists.scilab.org/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml" rel="nofollow" style="font:9px serif" target="_blank" link="external">NAML</a>
        </div></blockquote></div></div>


        
        
        
<br/><hr align="left" width="300" />
View this message in context: <a href="http://mailinglists.scilab.org/System-Identification-for-First-order-delay-and-dead-time-tp4034608p4034620.html">Re: System Identification for First order delay and dead time</a><br/>
Sent from the <a href="http://mailinglists.scilab.org/Scilab-users-Mailing-Lists-Archives-f2602246.html">Scilab users - Mailing Lists Archives mailing list archive</a> at Nabble.com.<br/>