How to plot an equation qith specific data range?

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Ivan Mich
Ivan Mich 2021-6-3
评论： Joseph Cheng 2021-6-3
Hello
I have a question about a code. I would like to plot an equation in a plot. But I would like to plot a specific data range of the equation.
E.g X values range from 0 to 100. But i would like to depict ONLY the values between 25-80for equation y.
clc
clear
x=0:5:100
y=3*x+10
y1=4*x+5
plot(x,y)
hold on
plot(x,y1)
could you please help me?

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回答（1 个）

Joseph Cheng
Joseph Cheng 2021-6-3
Ran in:
For this you can use the function ylim()
clc
clear
x=0:5:100;
y=3*x+10;
y1=4*x+5;
plot(x,y)
hold on
plot(x,y1)
ylim([25 80])
  2 个评论
Ivan Mich
Ivan Mich 2021-6-3
编辑：Ivan Mich 2021-6-3
Thank you but I would like to keep in the same plot the values for the another equation (y1 equation) that ranges between 0 to 100.
I would like to plot
y from 25 to 85 x values and
y1 from 0 to 100 x values
How to make it?
Joseph Cheng
Joseph Cheng 2021-6-3
Ran in:
there are lots of ways but since you are not very clear...................
clc
clear
x=0:5:100;
y=3*x(x>=25&x<=85)+10;
y1=4*x+5;
subplot(211)
plot(x(x>=25&x<=85),y);
hold on
plot(x,y1);
subplot(212)
y=3*x+10;
[ax h1 h2]=plotyy(x,y,x,y1);
ylim(ax(1),[25 85])

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