Using stem plot for two plots

2022 5 16
2 个回答
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更新时间：2022 5 16
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I have very basic question regarding drawing stem plot for this example, it is supposed to have 21 data values.
T=4e-3; n=21;
x=linspace(0,T/2,2001);
x1=linspace(T/2,T,2001);
y=sin(pi*x/T);
y1=(1+cos(pi*x1/T));
plot(x,y,'b',x1,y1);
grid on; zoom on; hold on

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Voss
Voss 2022-5-16
编辑：Voss 2022-5-16
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Ran in:
T=4e-3; n=21;
% x=linspace(0,T/2,2001);
% x1=linspace(T/2,T,2001);
x=linspace(0,T/2,(n+1)/2);
x1=linspace(T/2,T,(n+1)/2);
y=sin(pi*x/T);
y1=(1+cos(pi*x1/T));
% plot(x,y,'b',x1,y1);
stem(x,y,'b');
hold on
stem(x1,y1);
grid on; zoom on;

5 个评论
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Voss
Voss 2022-5-16
Ran in:
Ran in:
Or
T=4e-3; n=21;
% x=linspace(0,T/2,2001);
% x1=linspace(T/2,T,2001);
x=linspace(0,T/2,(n+1)/2);
x1=linspace(T/2,T,(n+1)/2);
y=sin(pi*x/T);
y1=(1+cos(pi*x1/T));
% plot(x,y,'b',x1,y1);
stem(x1,y1,'Color',[0.85 0.325 0.098]);
hold on
stem(x,y,'b');
grid on; zoom on;
Arkadius882
Arkadius882 2022-5-16
This one works which I'm very thankful of, but the plot should also be visible. I've been trying to connect these two but the plot must be drawn few thousand times (academic task) and because of that vectors are not the same length, at least it sounds like it to me.
T=4e-3; n=21;
x=linspace(0,T/2,2001);
xd=linspace(0,T/2,(n+1)/2);
x1=linspace(T/2,T,2001);
xd1=linspace(T/2,T,(n+1)/2);
y=sin(pi*x/T);
y1=(1+cos(pi*x1/T));
plot(x,y,'b',x1,y1);
grid on; zoom on; hold on;
stem(xd,y,'r*');
stem(xd1,y1,'r*');
Voss
Voss 2022-5-16
Ran in:
Ran in:
T=4e-3; n=21;
x=linspace(0,T/2,2001);
xd=linspace(0,T/2,(n+1)/2);
x1=linspace(T/2,T,2001);
xd1=linspace(T/2,T,(n+1)/2);
y=sin(pi*x/T);
yd=sin(pi*xd/T);
y1=(1+cos(pi*x1/T));
yd1=(1+cos(pi*xd1/T));
plot(x,y,'b',x1,y1);
grid on; zoom on; hold on;
stem(xd,yd,'r*');
stem(xd1,yd1,'r*');
Voss
Voss 2022-5-16
You're welcome!

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更多回答（1 个）

Steven Lord
Steven Lord 2022-5-16
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Ran in:
This looks like a reasonable plot to me.
T=4e-3; n=21;
x=linspace(0,T/2,2001);
x1=linspace(T/2,T,2001);
y=sin(pi*x/T);
y1=(1+cos(pi*x1/T));
plot(x,y,'b',x1,y1);
grid on; zoom on; hold on
Let's plot it as a stem plot instead.
figure
stem([x,x1], [y,y1]);
There are too many stems to show each one as an individual line. Let's plot every 100 stems and see how that looks.
figure
stem([x(1:100:end), x1(1:100:end)], [y(1:100:end), y1(1:100:end)])
That looks nice to me.

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