Nichols chart plot to gain polt Bode diagram

Hello everyone

How can I get a BODE graph from a NICHOLS graph

Code:

clc, clear

counter = ([1 1]);

denominator = conv([ 1 4 16],[1 2]);

First_fun =tf(counter,denominator)

bode(First_fun), grid on

counter_new = conv([1 1],[1]);

denominator_new =conv( conv([ 1 4 16],[1 2]),[1 0]);

new_fun =tf(counter_new,denominator_new)

figure(2)

bode(First_fun), grid on

hold on

bode(new_fun), grid on

legend('First_fun.','new_fun')

figure(3)

nichols(new_fun), grid on

Answer 1

[Shahar ben ezra]

like this graph

from: