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Define range of y axis, instead of just x axis?

asked 2013-06-21 11:08:56 -0500

anonymous user

Anonymous

updated 2015-01-14 02:52:04 -0500

FrédéricC gravatar image

I was able to successfully define & display a graph of a linear equation, with the following statement:

plot(2*x+1, (-5,5))

The (-5, 5), successfully specifies an x axis range; but i haven't found any success in being able to explicitly define the range of the y axis.

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answered 2013-06-21 11:32:04 -0500

kcrisman gravatar image
plot(2*x+1, (x,-5,5),ymin=1,ymax=5)

is the preferred syntax.

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plot(2*x+1, (-5,5),ymin=-4,ymax=4) This worked, thanks. What if the given the function: y^2 = x How would 1 plot it? I was able to do: plot(sqrt(x)) But as you know, one can't find the sqrts of negative number; so only the top half of the graph was displayed. The bottom half wasn't displayed :

bxdin gravatar imagebxdin ( 2013-06-21 11:50:08 -0500 )edit
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Your best option here is to use `implicit_plot`. Try `implicit_plot(y^2==x,(x,-5,5),(y,-5,5))`.

calc314 gravatar imagecalc314 ( 2013-06-21 16:15:41 -0500 )edit

y^2 =x is not a function; it fails the vertical line test. You could also try A=plot(sqrt(x),(x,0,1)) B=plot(-sqrt(x),(x,0,1)) show(A+B,xmin=-1,xmax=1)

dazedANDconfused gravatar imagedazedANDconfused ( 2013-06-21 16:19:32 -0500 )edit

Or you could do `var('y'); plot(y^2,(y,-5,5),axes_labels=['$y$','$x$'])` if you wanted to be tricky - see [this link](http://sagecell.sagemath.org/?q=73417d65-fe8a-43f5-90a5-b9105813a02d).

kcrisman gravatar imagekcrisman ( 2013-06-24 08:37:44 -0500 )edit
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answered 2013-06-21 11:37:07 -0500

ndomes gravatar image
plot(2*x+1, (-5,5),ymin=-4,ymax=4)

Unfortunally

plot?

doesn't show the options ymin, ymax, but some examples do.

You can look for the options:

Evaluate:

P = plot(2*x+1)

Then type

P.

and hit the tab key

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This is because ymin, ymax are actually an option to show(). The documentation in plot() links to the documentation of show() for this and many other options. It also mentions ymin/ymax explicitly in a special "Note" section.

ppurka gravatar imageppurka ( 2013-06-22 05:55:10 -0500 )edit

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Asked: 2013-06-21 11:08:56 -0500

Seen: 1,416 times

Last updated: Jun 21 '13