bode function plot Help

2 次查看（过去 30 天）

Jackson 2020-3-19

评论： Fangjun Jiang 2020-3-19

I am trying to use the bode function on Matlab. The function i am trying to type in Matlab is H(s) = 10s/ (s+2).

This is my code

close all
clear all
s = tf('s')
H= 10*(s) /(s+2) ;
bode(H)
grid 
x=1 

The bottom is the error I keep getting.

Undefined function 'tf' for input arguments of type 'char'.

Error in Untitled (line 4)

s = tf('s')

How would i fix this?

Ameer Hamza 2020-3-19

The line

s = tf('s')

is correct in MATLAB's syntax. Which version of MATLAB are you using?

Jackson 2020-3-19

I am using MATLAB2019b

Fangjun Jiang 2020-3-19

编辑：Fangjun Jiang 2020-3-19

You may not have the Control System Toolbox, which is required for having tf().

Run "ver control" to find out

>> H=tf([10,0],[1,2])
H =
 
  10 s
  -----
  s + 2
 
Continuous-time transfer function.

Jackson 2020-3-19

How do I install the Control System Toolboxs to MAtlab?

Fangjun Jiang 2020-3-19

Well, you need purchase, download and then install from the Mathworks website.

在 Help Center 和 File Exchange 中查找有关 Get Started with Control System Toolbox 的更多信息

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