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False implicit plot

asked 2019-03-03 18:38:12 +0100

creyesm1992 gravatar image


I write in SAGE

implicit_plot(y==1/2, (-1,1),(-1,1))

and it returns the graph of the line x=1/2. Why?

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answered 2019-03-03 18:54:52 +0100

vdelecroix gravatar image

Sage does not guess the names of the variables (you could have been using any name). As your expression contains a single variable, it assumes that this is the first variable (what you would call "x"). To get what you want, use the more explicit syntax

sage: x = var('x')
sage: y = var('y')
sage: implicit_plot(y==1/2, (x,0,1), (y,0,1))
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thanks vdelecroix!!!

creyesm1992 gravatar imagecreyesm1992 ( 2019-03-03 19:00:25 +0100 )edit

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Asked: 2019-03-03 18:38:12 +0100

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Last updated: Mar 03 '19