[Matplotlib-users] ValueError: x and y must have same first dimension

[surfcast23 <sur...@gm...>]

Hi 
I have a code to plot a histogram and I am trying to add a best fit line
following this example

http://matplotlib.sourceforge.net/examples/pylab_examples/histogram_demo.html

but run into this error

Traceback (most recent call last):
  File "/home/Astro/count_Histogram.py", line 54, in <module>
    l = plt.plot(bins, y, 'r--', linewidth=1)
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 2467, in
plot
    ret = ax.plot(*args, **kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 3893, in plot
    for line in self._get_lines(*args, **kwargs):
  File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 322, in
_grab_next_args
    for seg in self._plot_args(remaining, kwargs):
  File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 300, in
_plot_args
    x, y = self._xy_from_xy(x, y)
  File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 240, in
_xy_from_xy
    raise ValueError("x and y must have same first dimension")
ValueError: x and y must have same first dimension

My Code 

import matplotlib.pyplot as plt
import math
import numpy as np
import mpl_toolkits.mplot3d.axes3d
import matplotlib.mlab as mlab

counts = []
F = '/home/Astro/outfiles/outmag21_5dr_38_68.txt'
f = open(F)
for line in f:
 if line != ' ':      
    columns = line.split() 
    count = columns[3]     
    count = int(count)
    counts.append(count)
    C  = np.array(counts, dtype=float)
    
avg = sum(C)/len(C)
diff = C-avg
sigma = np.sqrt((1./len(C))*(diff**2))

bins = 20
plt.hist(C, bins, range=None, normed=False, weights=None, cumulative=False,
bottom=None, histtype='bar', align='mid', orientation='vertical',
rwidth=None, log = False, color=None, label=None)
plt.title("")
plt.text(25,20,'M < -21.5' '\n' 'N Halos 3877' '\n' 'Length Cell 38.68Mpc'
'\n' 'N Cells 269' '\n' 'Avg Halo per Cell 14.35 ')
plt.xlabel("Halos/Cell")
plt.ylabel("Number Cells with N Halos")
y = mlab.normpdf( bins, avg, sigma)
print(len(y))
l = plt.plot(bins, y, 'r--', linewidth=1)
plt.show()


My first question is do x and y refer to the values in  l = plt.plot(bins,
y, 'r--', linewidth=1) which for my case are bins and y?
if that is the case how can I get then to be the same first dimension?
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