Problem with 2D plotting

Question

Orion 2015-9-1

评论： Star Strider 2015-9-1

I have the following graph:

but what I need is for all 3 lines to stop at y=2, and not continue any further.

How could I do that?

Answer 1

Star Strider 2015-9-1

You didn’t post your code, so I can only offer you the most obvious solution. Put this line just below the plot call in your code:

axis([xlim 0 2])

Star Strider 2015-9-1

Nebojsa’s Answer moved here:

Ah yes, that was silly of me. Here's the code:

EDU>> x=[0,10,120];
EDU>> a=1/30*x;
EDU>> b=3/4*a;
EDU>> c=1.5*b;
EDU>> plot(x,a,x,b,x,c)

Star Strider 2015-9-1

This works:

x = linspace(0, 120);
a=1/30*x;
b=3/4*a;
c=1.5*b;
plot(x(a<=2),a(a<=2), x(b<=2),b(b<=2), x(c<=2),c(c<=2))

Experiment to get the result you want.

This approach uses ‘logical indexing’ to limit the plots. See Using Logicals in Array Indexing for a full explanation.