bode plot
in [Matlab]
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From: Ongun Palaoglu on 11 Jun 2010 23:06 Hello I have a function for frequency analysis. I have equations something like on this link, http://www.mathworks.com/access/helpdesk/help/toolbox/control/ref/bode.html first example, but whenever I copy that to look at it, Undefined function or method 'tf' for input arguments of type 'double'. this error shows up, I cannot use the regular plot function, because i have imaginary number.
From: Wayne King on 12 Jun 2010 09:13 "Ongun Palaoglu" <ongun(a)mac.com> wrote in message <huutit$7pg$1(a)fred.mathworks.com>... > Hello I have a function for frequency analysis. I have equations something like on this link, http://www.mathworks.com/access/helpdesk/help/toolbox/control/ref/bode.html first example, but whenever I copy that to look at it, Undefined function or method 'tf' for input arguments of type 'double'. this error shows up, I cannot use the regular plot function, because i have imaginary number. > Hi Ongun, Do you have the Control System Toolbox? That error indicates that you don't have tf.m in your installation. When you say that you have a function "something like" example one on bode.html, do you have a continuous system function?, or is it discrete? If you have a system represented by a constant coefficient linear difference equation, you can use fvtool to visualize the frequency response. Wayne
From: us on 12 Jun 2010 09:15
"Ongun Palaoglu" <ongun(a)mac.com> wrote in message <huutit$7pg$1(a)fred.mathworks.com>... > Hello I have a function for frequency analysis. I have equations something like on this link, http://www.mathworks.com/access/helpdesk/help/toolbox/control/ref/bode.html first example, but whenever I copy that to look at it, Undefined function or method 'tf' for input arguments of type 'double'. this error shows up, I cannot use the regular plot function, because i have imaginary number. > a hint: - make sure you own and have properly installed the control system tbx... ver control; % should yield a valid output... us |