I've tried using MATLAB R2023b to generate bode plots and calculate DC gains of transfer function but I keep on receiving an error message: 'Wrong number of input arguments'

syms s
b = (s + 1)/(s + 100)

b =

(s + 1)/(s + 100)

>> k = dcgain(b)

Error using dcgain

Wrong number of input arguments.

>> bode(b)

Error using bode

Not enough input arguments.

Answer 1

[Star Strider]

Wrong syntax. Use the tf function, not syms for Control System Toolbox functions.

Try this instead —

s = tf('s');

b = (s + 1)/(s + 100)

b =
 
   s + 1
  -------
  s + 100
 
Continuous-time transfer function.

 
k = dcgain(b)

k = 0.0100

bode(b)
grid

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[Joel Davis]

Thank you! Just realised my mistake.

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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