Matlab question

[The Jester]

If I have two vectors which hold the coefficients for the transfer function of an analog filter (one vector for the numerator and one for the denominator) and a second pair of vectors which describe a the tranfer function of a digital filter, how would I go about plotting both systems' frequency responses on a single graph?

[Xenophobe3691]

Depends. How do you want it arranged?

Generally, you can use the subplot command as so:

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subplot(# of plots, Arrangement of plots, Plot#);plot(t,x);then the rest.

Example:

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subplot(2,1,1);
subplot(2,1,2);

Would create:

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Plot 1               Plot 2

Whereas:

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subplot(2,2,1);
subplot(2,2,2);

Would create:

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Plot 1


Plot 2

[The Jester]

Depends. How do you want it arranged?

Similar to the output figure of freqz or freqs with plots for both magnitude and phase responses for both filters.

[Gerald Tarrant]

If you want multiple functions in the same plot/axes you can also use the

"hold"

or

"hold all"

hold all assigns different colors to each function