Plotting Transfer Functions Using Matlab

[mpm]

I am using a bode plot program using Matlab to try and plot transfer functions.

Here is the program I have:
http://www.swarthmore.edu/NatSci/echeeve1/Ref/Bode/BodePlotGui.html

Everytime I try and type in the command that it says to use, it gives me a tf is an unknown variable.

Does anyone know how I can get this to work?

 

[mpm]

I figured out how to get the zeros, poles, and gain by using this:

num = [2 3];
den = [1 4 0 5];
[z,p,k] = tf2zp(num,den)

But I can't figure out how to plot this to find the frequency response and bandwidth.

Note: I am just trying to find alternatives since I can't get this other program to work. Anything that works I will use.

 

[tacman]

Hi there,

Thank you for sharing your experience with using Matlab to plot transfer functions. It seems like you are encountering an error when trying to use the command for plotting transfer functions.

First, it is important to make sure that you have defined the transfer function using the correct syntax. In Matlab, transfer functions are typically defined using the 'tf' function, with the numerator and denominator coefficients as inputs. For example, if you have a transfer function with a numerator of [1 2] and a denominator of [1 3], you would define it as tf([1 2],[1 3]).

Once you have defined your transfer function, you can use the 'bode' function to plot it on a Bode plot. This function takes the transfer function as an input, along with any desired plot options. For example, if you want to plot the magnitude and phase in decibels, you can use the command bode(tf([1 2],[1 3]),'dB').

If you continue to encounter errors, it may be helpful to consult the Matlab documentation or reach out to the Matlab community for assistance. Best of luck with your transfer function plotting!