using sisotool and controlsystemdesign for designing a controller

hi

i'm gonna design a controller by using sisotool but as I define a trasnfer function and try to open sisotool it shows me below error:

Error using controlSystemDesigner (line 245)

The model for "G" must be single input, single output.

Error in sisotool (line 88)

h = controlSystemDesigner(varargin{:});

even when I try to obtain a step response by using 'step' command it either doesn't work and shows me the same error as written above

whooooooooooooooooooooooooo can help me ??

[Raj]

Can you share your system model? (transfer function)

[Amir Hosein Fardi]

no matter what ur system is!!

but it's g=.024187*(z+.9672)/(z-1)/(z-0.9048)

[Amir Hosein Fardi]

no matter what ur system is!!

but it's g=.024187*(z+.9672)/(z-1)/(z-0.9048)

[David Wilson]

Works for me.

Are you sure you have defined the correct transfer function?

Try the following:

z = tf('z',1) % discrete variable (with Ts = 1)
g = 0.024187*(z+.9672)/(z-1)/(z-0.9048)
zpk(g) % check TF

Now open sisotool or other controller design tool, say

C = pidtune(g,'pi')