Transfer function (tf) with sqrt function.
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From: Aleks Dyskin on 18 Nov 2009 10:40 Hi! I have an analytic transfer function like: TF=sqrt(1+s) but when I write the next code: s=tf('s') Sys=sqrt(1+s) Matlab says: Undefined function or method 'sqrt' for input arguments of type 'tf' Could somebody help me how to overcome this problem? Thanks!
From: joe on 18 Nov 2009 11:16 "Aleks Dyskin" <aleks.dyskin(a)gmail.com> wrote in message <he14qa$5fm$1(a)fred.mathworks.com>... > Hi! > I have an analytic function f=sqrt(1+s) > And i want to turn it to the transfer function by the next code: > s=tf('s') > sys=sqrt(1+s) > > But Matlab says: > Undefined function or method 'sqrt' for input arguments of type 'tf' > Could somebody help me with this issue? What should I do to overcome it? > Thanks! Hi the function Sqrt(value)= (value) power 1/2=value^1/2.... The tf need the interger value in power to make your system. I think you cann?t give up something like that ... joe
From: Aleks Dyskin on 18 Nov 2009 11:25
"joe " <courstelecom(a)yahoo.fr> wrote in message <he16k6$v$1(a)fred.mathworks.com>... > "Aleks Dyskin" <aleks.dyskin(a)gmail.com> wrote in message <he14qa$5fm$1(a)fred.mathworks.com>... > > Hi! > > I have an analytic function f=sqrt(1+s) > > And i want to turn it to the transfer function by the next code: > > s=tf('s') > > sys=sqrt(1+s) > > > > But Matlab says: > > Undefined function or method 'sqrt' for input arguments of type 'tf' > > Could somebody help me with this issue? What should I do to overcome it? > > Thanks! > > Hi > the function Sqrt(value)= (value) power 1/2=value^1/2.... > The tf need the interger value in power to make your system. I think you cann?t give up something like that ... > > joe So how could I plot the freq. response for my function? Is there any way to do it? THanks a lot! |