tfdata (Control Design and Simulation Module, MathScript Function)
Member of the info class.
Syntax
[num, den, Ts] = tfdata(SysInTF)
[num, den, Ts] = tfdata(SysInTF, iy, iu)
[num, den, delay, Ts] = tfdata(SysInTF)
[num, den, delay, Ts] = tfdata(SysInTF, iy, iu)
Description
Returns information about a transfer function system model.
Inputs
| Name | Description |
| SysInTF | Specifies a linear time-invariant (LTI) system model in transfer function form. |
| iy | Specifies the index number of a model output. The default value is 1. iy is an integer scalar. |
| iu | Specifies the index number of a model input. iu is an integer scalar. |
Outputs
| Name | Description |
| num | Returns the coefficients of the numerator polynomial function, in descending order. num either is a real scalar or a real vector, depending on the number of coefficients. |
| den | Returns the coefficients of the denominator polynomial function, in descending order. den either is a real scalar or a real vector, depending on the number of coefficients. |
| delay | Returns the total delay present in the SysInTF model, in seconds. |
| Ts | Returns the sampling time of the SysInTF model. If the value of Ts is 0, the SysInTF model is continuous. Otherwise, the model is discrete. |
Examples
num1 = 1num2 = 2
den1 = [1, 1]
den2 = [1, -1]
r = 1
m = 2
SysInTF = tf(num1, num2, den1, den2, [r, m])
[num2, den2] = tfdata(SysInTF, 1, 2)