matplotlib-users

[Matplotlib-users] Same X and Y scale

[Nikolaus R. <Nik...@ra...>]

Hi,

Consider this:

X = np.linspace(0.70, 1.1, 100)
Y = np.linspace(-1.19, 1.19, 70)
(Xs, Ys) = np.meshgrid(X, Y)
Z = np.sqrt((Xs-0.9)**2 + Ys**2) - 0.10
fig = plt.figure()
ax = fig.add_subplot(111)
ax.contour(X, Y, Z)
fig.show()

This works, but gives the y axis a different scale than the x axis so
the ellipses look like circles.

How can I get the same scale for the x- and y-axis?

I tried to set ax.set_autoscale_on(False), but that resulted in a
totally different part of the coordinate system being shown.



Thanks,

   -Nikolaus

-- 
 »Time flies like an arrow, fruit flies like a Banana.«

  PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6  02CF A9AD B7F8 AE4E 425C

Re: [Matplotlib-users] Same X and Y scale

[Ryan M. <rm...@gm...>]

On Jul 30, 2010, at 14:34, Nikolaus Rath <Nik...@ra...> wrote:

> Hi,
> 
> Consider this:
> 
> X = np.linspace(0.70, 1.1, 100)
> Y = np.linspace(-1.19, 1.19, 70)
> (Xs, Ys) = np.meshgrid(X, Y)
> Z = np.sqrt((Xs-0.9)**2 + Ys**2) - 0.10
> fig = plt.figure()
> ax = fig.add_subplot(111)
> ax.contour(X, Y, Z)
> fig.show()
> 
> This works, but gives the y axis a different scale than the x axis so
> the ellipses look like circles.
> 
> How can I get the same scale for the x- and y-axis?
> 
> I tried to set ax.set_autoscale_on(False), but that resulted in a
> totally different part of the coordinate system being 

Try:

ax.set_aspect('equal')

Ryan

Re: [Matplotlib-users] Same X and Y scale

[Nikolaus R. <Nik...@ra...>]

Ryan May <rma...@pu...> writes:
> On Jul 30, 2010, at 14:34, Nikolaus Rath <Nik...@pu...> wrote:
>
>> Hi,
>> 
>> Consider this:
>> 
>> X = np.linspace(0.70, 1.1, 100)
>> Y = np.linspace(-1.19, 1.19, 70)
>> (Xs, Ys) = np.meshgrid(X, Y)
>> Z = np.sqrt((Xs-0.9)**2 + Ys**2) - 0.10
>> fig = plt.figure()
>> ax = fig.add_subplot(111)
>> ax.contour(X, Y, Z)
>> fig.show()
>> 
>> This works, but gives the y axis a different scale than the x axis so
>> the ellipses look like circles.
>> 
>> How can I get the same scale for the x- and y-axis?
>> 
>> I tried to set ax.set_autoscale_on(False), but that resulted in a
>> totally different part of the coordinate system being 
>
> Try:
>
> ax.set_aspect('equal')

Works perfectly, thanks!


   -Nikolaus

-- 
 »Time flies like an arrow, fruit flies like a Banana.«

  PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6  02CF A9AD B7F8 AE4E 425C