Hey Guys,

I'm trying to do a basic line graph here, but I can't seem to figure out how to adjust my x axis.

from pylab import *

plot ( range(0,10),[9,4,5,2,3,5,7,12,2,3],'.-',label='sample1' )
plot ( range(0,10),[12,5,33,2,4,5,3,3,22,10],'o-',label='sample2' )
xlabel('x axis')
ylabel('y axis')
title('my sample graphs')
legend(('sample1','sample2'))
savefig("sampleg.png",dpi=(640/8))

show()

And here is the error I get when I try adjusting my range.

File "C:\Python26\lib\site-packages\matplotlib\axes.py", line 228, in _xy_from_xy
    raise ValueError("x and y must have same first dimension")
ValueError: x and y must have same first dimension

I want my range to be a list of strings: ["12/1/2007","12/1/2008", "12/1/2009","12/1/2010"

Any suggestions?

>>> ["12/1/200"+str(x) for x in range(7,11)]
['12/1/2007', '12/1/2008', '12/1/2009', '12/1/20010']
>>>

You will have to include the complete error message, which prints the line where the error was found. We are volunteers so no one will take the time to try and guess which line is causing the error.

A complete error message looks like this:

 ./test_1.py
  File "./test_1.py", line 20
    if start > -1
                ^
SyntaxError: invalid syntax

Edited 6 Years Ago by woooee: n/a

Traceback (most recent call last):
  File "C:\PortablePython_1.1_py2.6.1\App\April_2010\graphing lines.py", line 3, in <module>
    plot ( range(0,11),[9,4,5,2,3,5,7,12,2,3],'.-',label='sample1' )
  File "C:\PortablePython_1.1_py2.6.1\App\Lib\site-packages\matplotlib\pyplot.py", line 2141, in plot
    ret = ax.plot(*args, **kwargs)
  File "C:\PortablePython_1.1_py2.6.1\App\Lib\site-packages\matplotlib\axes.py", line 3432, in plot
    for line in self._get_lines(*args, **kwargs):
  File "C:\PortablePython_1.1_py2.6.1\App\Lib\site-packages\matplotlib\axes.py", line 311, in _grab_next_args
    for seg in self._plot_args(remaining, kwargs):
  File "C:\PortablePython_1.1_py2.6.1\App\Lib\site-packages\matplotlib\axes.py", line 288, in _plot_args
    x, y = self._xy_from_xy(x, y)
  File "C:\PortablePython_1.1_py2.6.1\App\Lib\site-packages\matplotlib\axes.py", line 228, in _xy_from_xy
    raise ValueError("x and y must have same first dimension")
ValueError: x and y must have same first dimension

I tried to install matplotlib/pylab to run your code but there are problems with the png dependency and I can't spend any more time on it now. Anyway, this line seems to be the problem

plot ( range(0,11),[9,4,5,2,3,5,7,12,2,3],'.-',label='sample1' )
##
##   try using this and see if there is any difference
##
x_list = arange(range(0,11))
y_list = arange([9,4,5,2,3,5,7,12,2,3])
plot( x_list, y_list, 'b')
show()

Edited 6 Years Ago by woooee: n/a

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