ylim does not work

Hello,
I'm new to this forum, so please forgive me if I'm fogetting any
information.
I use python 2.5 and matplotlib version 0.91.2.0005.
I'm plotting data that I get out of a database, which works fine. The only
thing that doesn't work, although it works with any other simple plot, is
the xlim()- and ylim()-function.
My (simplified) code is:

···

#######################################
import MySQLdb
import beamfpy
import os
from scipy.io import *
from pylab import *
from numpy import *
from scipy import *
from matplotlib.cm import ScalarMappable

conn = MySQLdb.connect (host = "localhost",
                           user = "root",
                           db = "some_database")
cursor = conn.cursor()

krit='''
SELECT xxx
FROM xxx
WHERE xxx
ORDER xxx
'''

# text-properties
ts=7
rc('font', family='sans-serif',size=ts)
rc('axes', labelsize=ts)
#~ rc('lines', mew=1.0)
rc('xtick',labelsize=ts)
rc('ytick',labelsize=ts)

# plot-properties
lw=0.4
ms=1.0

for id in (7,8,9,10,11):
  cursor.execute(krit,(str(id)))
  ergall=cursor.fetchall()
  value1=array(map(lambda x:float(x[0]),ergall))
  value2=array(map(lambda x:float(x[1]),ergall))
  figure(1,figsize=(8.4/2.56,0.75*8.4/2.56))
  plot(value1,value2,'.-k',linewidth=lw,markersize=ms)
  ylim(-9,13)
  xlim(-2,25)
  if id==7:
    for i in range(len(value1)):
      if L[i]>=0:
    
text(value1[i]-1.8,value2[i]+0.2,str(value1)+u'°',color='r',fontsize=ts-2)
      else:
      
text(value1[i]-1.6,value2[i]-1.8,str(value1)+u'°',color='r',fontsize=ts-2)

xlabel('$c_{d,n}$',fontsize=ts)
ylabel('$c_{l,n}$',fontsize=ts)
ylim(-9,13)
xlim(-2,25)
axhline(color='k')
gca().set_position([0.15,0.17,0.75,0.75])
filename='Fig1.eps'
savefig(filename)
os.system("epstopdf "+filename)

cursor.close()
conn.close()
show()
#####################################################

As you see, I even call the xlim()- and ylim()-functions twice, once in the
loop and the second time outside the loop. I tried both versions, too, but
nothing worked.
Can you help me?

Thank you very much!

CliftonH
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CliftonH wrote:

Hello,
I'm new to this forum, so please forgive me if I'm fogetting any
information.
I use python 2.5 and matplotlib version 0.91.2.0005.
I'm plotting data that I get out of a database, which works fine. The only
thing that doesn't work, although it works with any other simple plot, is
the xlim()- and ylim()-function.
My (simplified) code is:

#######################################
import MySQLdb
import beamfpy
import os
from scipy.io import *
from pylab import *
from numpy import *
from scipy import *
from matplotlib.cm import ScalarMappable

conn = MySQLdb.connect (host = "localhost",
                           user = "root",
                           db = "some_database")
cursor = conn.cursor()

krit='''
SELECT xxx
FROM xxx
WHERE xxx
ORDER xxx
'''

# text-properties
ts=7
rc('font', family='sans-serif',size=ts)
rc('axes', labelsize=ts)
#~ rc('lines', mew=1.0)
rc('xtick',labelsize=ts)
rc('ytick',labelsize=ts)

# plot-properties
lw=0.4
ms=1.0

for id in (7,8,9,10,11):
  cursor.execute(krit,(str(id)))
  ergall=cursor.fetchall()
  value1=array(map(lambda x:float(x[0]),ergall))
  value2=array(map(lambda x:float(x[1]),ergall))
  figure(1,figsize=(8.4/2.56,0.75*8.4/2.56))
  plot(value1,value2,'.-k',linewidth=lw,markersize=ms)
  ylim(-9,13)
  xlim(-2,25)
  if id==7:
    for i in range(len(value1)):
      if L[i]>=0:
    
text(value1[i]-1.8,value2[i]+0.2,str(value1)+u'°',color='r',fontsize=ts-2)
      else:
      
text(value1[i]-1.6,value2[i]-1.8,str(value1)+u'°',color='r',fontsize=ts-2)

xlabel('$c_{d,n}$',fontsize=ts)
ylabel('$c_{l,n}$',fontsize=ts)
ylim(-9,13)
xlim(-2,25)
axhline(color='k')
gca().set_position([0.15,0.17,0.75,0.75])
filename='Fig1.eps'
savefig(filename)
os.system("epstopdf "+filename)

cursor.close()
conn.close()
show()
#####################################################

As you see, I even call the xlim()- and ylim()-functions twice, once in
the loop and the second time outside the loop. I tried both versions, too,
but nothing worked.
Can you help me?

Thank you very much!

CliftonH

Okay, I found it myself. Somehow the "axhline(color='k')" prevents the
ylim()-function from working. But I still don't know why.

···

--
View this message in context: http://www.nabble.com/ylim-does-not-work-tp19000814p19001056.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

Here is your problem -- all matplotlib plotting functions trigger the
autoscaling functionality, so your previous xlim/ylim setting is being
overridden. To prevent this, either call xlim/ylim *after* the
plotting function, or turn autoscaling off

   gca().set_autoscale_on(False)

JDH

···

On Fri, Aug 15, 2008 at 10:39 AM, CliftonH <tfgeyer@...273...> wrote:

I'm plotting data that I get out of a database, which works fine. The only
thing that doesn't work, although it works with any other simple plot, is
the xlim()- and ylim()-function.

ylim(-9,13)
xlim(-2,25)
axhline(color='k')