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Plotting a line

asked 2017-11-08 01:31:27 -0600

pmg gravatar image

I have

x,y = var('x y')

f = (2x + 3y == 0)

How do I plot it

plot(f) gives the error:

Traceback (click to the left of this block for traceback) ... ValueError: Variable 'y' not found

And since it complained about y, why didn't it complain about x? Also, where would I find the docs for this question?

And yes, I am a beginner at sage

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answered 2017-11-08 04:01:26 -0600

tmonteil gravatar image

The plot will work if you provide a function:

sage: x = SR.var('x')
sage: f = -2*x/3
sage: plot(f,-1,1)

In your case, f is an equation, so you need to use implicit_plot as follows:

sage: x,y = SR.var('x y')
sage: f = (2*x + 3*y == 0)
sage: implicit_plot(f,(-1,1),(-1,1))
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Asked: 2017-11-08 01:27:48 -0600

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Last updated: Nov 08