On 03/11/2012 05:06 AM, aa wrote:
> How to Get symmetric plotting in pylab....
> i tried this code:
> # -*- coding: utf-8 -*-
>
> """
>
> Created on Sat Mar 10 20:33:32 2012
>
> @author: fajar
>
> """
>
> from numpy import linspace, meshgrid, array
>
> import matplotlib.pyplot as pl
>
> import matplotlib.ticker as tc
>
> from scipy.integrate import odeint
>
> # membuat vektor
>
> u = linspace(-5,5,25)
>
> v = linspace(-5,5,25)
>
> U,V = meshgrid(u,v)
>
> def fu(u,v): return 2*u-2*v
>
> def fv(u,v): return 2*u-3*v
>
> FU = fu(U,V)
>
> FV = fv(U,V)
>
> # sistem Persamaan:
>
> def g(x,t):
>
> y1 = 2*x[0]-1*x[1]
>
> y2 = 1*x[0]-2*x[1]
>
> return [y1, y2]
>
> time = linspace(-1,-.6,100)
>
> con = array([[1,2],[1.5,-3],[-1.5,3],[-1.5,-3]])
>
> pl.figure()
>
> Q = pl.quiver(U,V,FU,FV, units='height', hold=True)
Try using the pivot kwarg, which tells which part of the arrow will be
at the specified position. The default is "tail". You can use "middle"
to center the arrows, or "tip" to have the arrows end at your FU, FV points.
Eric
>
> #sol = odeint(g, con[0], time)
>
> #pl.plot(sol[:,0], sol[:,1], linewidth=2.1 , color='y')
>
> #
>
> #sol = odeint(g, con[1], time)
>
> #pl.plot(sol[:,0], sol[:,1], linewidth=2.1,color='b')
>
> #
>
> #sol = odeint(g, con[2], time)
>
> #pl.plot(sol[:,0], sol[:,1], linewidth=2.1 , color='m')
>
> #
>
> #sol = odeint(g, con[3], time)
>
> #pl.plot(sol[:,0], sol[:,1], linewidth=2.1 , color='r')
>
> #
>
> pl.autoscale(enable=True,axis='Both', tight=True)
>
> #tc.AutoLocator()
>
> tc.MaxNLocator(9,symmetric=True)
>
> #pl.xlabel('u', weight='bold')
>
> #pl.ylabel('v', weight='bold')
>
> #pl.title('u\'=u dan v\'=-2v',weight='bold')
>
> #pl.autoscale()z
>
> pl.show()
>
>
> ---
> but i get picture like in this attach... (aa.png)
> what i need is to Make side of figure stright... not oblique...
> like this attach (ab.png)...
> with coresponding code:
> # -*- coding: utf-8 -*-
>
> """
>
> Created on Sat Mar 10 20:33:32 2012
>
> @author: fajar
>
> """
>
> from numpy import linspace, meshgrid, array
>
> import pylab as pl
>
> from scipy.integrate import odeint
>
> # membuat vektor
>
> u = linspace(-5,5,21)
>
> v = linspace(-5,5,21)
>
> U,V = meshgrid(u,v)
>
> def fu(u,v):return u
>
> def fv(u,v):return -2*v
>
> FU = fu(U,V)
>
> FV = fv(U,V)
>
> # sistem Persamaan:
>
> def g(x,t):
>
> y1 = x[0]
>
> y2 = -2*x[1]
>
> return [y1, y2]
>
> time = linspace(0,1,100)
>
> con = array([[1.5,3],[1.5,-3],[-1.5,3],[-1.5,-3]])
>
> pl.figure()
>
> Q = pl.quiver(U,V,FU,FV, units='height', hold=True)
>
> sol = odeint(g, con[0], time)
>
> pl.plot(sol[:,0], sol[:,1], linewidth=2.1 , color='y')
>
> sol = odeint(g, con[1], time)
>
> pl.plot(sol[:,0], sol[:,1], linewidth=2.1,color='b')
>
> sol = odeint(g, con[2], time)
>
> pl.plot(sol[:,0], sol[:,1], linewidth=2.1 , color='m')
>
> sol = odeint(g, con[3], time)
>
> pl.plot(sol[:,0], sol[:,1], linewidth=2.1 , color='r')
>
> pl.autoscale(enable=True,axis='Both', tight =True)
>
> pl.xlabel('u', weight='bold')
>
> pl.ylabel('v', weight='bold')
>
> pl.title('u\'=u dan v\'=-2v',weight='bold')
>
> pl.show()
> --
> i'm sorry, i didn't well to speak english, but i guess you know what
> mean... thanks before.... :)
>
>
>
>
>
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