My subplot images are cut off, why?

2 次查看（过去 30 天）
Leandro de Oliveira
回答： Leandro de Oliveira 2019-9-2
My images gets cut off when the function is on steady state, I think the problem comes from step command, because I'm getting [y, t] = step(sys)
informations and I don't know why this cut off automatically when a plot inside a subplot!
clc
clear all
syms s;
format short
%-------------------------------------------------------------------------%
% I)
wn1 = 1; k1 = [0 0 5]; zeta1 = [1.5, 0.7, 0.3];
G1 = tf(k1, [1 2*zeta1(1)*wn1 wn1^2]);
G2 = tf(k1, [1 2*zeta1(2)*wn1 wn1^2]);
G3 = tf(k1, [1 2*zeta1(3)*wn1 wn1^2]);
%-------------------------------------------------------------------------%
% II)
wn2 = 10; k2 = [0 0 5]; zeta2 = [1.5, 0.7, 0.3];
G4 = tf(k2, [1 2*zeta2(1)*wn2 wn2^2]);
G5 = tf(k2, [1 2*zeta2(2)*wn2 wn2^2]);
G6 = tf(k2, [1 2*zeta2(3)*wn2 wn2^2]);
%-------------------------------------------------------------------------%
lw = 3; %linewidth
ax1 = subplot(2,1,1); %i
hold on
[a,b] = step(G1);
plot(b, squeeze(a), 'LineWidth', lw, 'Color', 'r');
[a1,b1] = step(G2);
plot(b1, squeeze(a1), 'LineWidth', lw, 'Color', 'g');
[a2,b2] = step(G3);
plot(b2, squeeze(a2), 'LineWidth', lw, 'Color', 'b');
hold off
grid on
ax2 = subplot(2,1,2); %ii
hold on
[a3,b3] = step(G4);
plot(b3, squeeze(a3), 'LineWidth', lw, 'Color', 'r');
[a4,b4] = step(G5);
plot(b4, squeeze(a4), 'LineWidth', lw, 'Color', 'g');
[a5,b5] = step(G6);
plot(b5, squeeze(a5), 'LineWidth', lw, 'Color', 'b');
hold off
grid on
untitled.jpg

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采纳的回答

Leandro de Oliveira
SOLVED!
Actually is a simple thing, when whe plot getting step parameters we have to tell step xlim that we want the Tfinal, otherwise the step will automatically choose xlim as the stead state (I guess), so the correct way to get step parameter before plot is:
G = sys
[y, t] = step(sys, Tfinal) %Tfinal here commands plot xlim final value (higher hierarchy)
plot(t, squeeze(y))
xlim([0 Tfinal])

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