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Subject: Re: [nltk-users] pylab: ValueError: x and y must have same first dimension
From: =?iso-8859-1?Q?peter_ljungl=F6f?= <peter.ljung...@heatherleaf.se>
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Why do you use string quotes in the calls to y.extend and index.extend?

/Peter

22 aug 2012 kl. 06:10 skrev typetoken:

> I wrote the following codes to make a plot. However, it pops up  =
ValueError: x and y must have same first dimension.  Any tips for the =
following codes? thanks.
>=20
> >>> def zif(text):
> 	fdist =3D nltk.FreqDist(text)
> 	import pylab
> 	word =3D fdist.keys()
> 	x =3D []
> 	y =3D []
> 	index =3D []
> 	for i in range(0,len(set(text)),1):
> 		x.extend(word[i:i+1])
> 		y.extend('fdist[word[i:i+1]]')
> 		index.extend('i+1')
> 	pylab.plot(index, y,'b')
> 	pylab.title('zipf law')
> 	pylab.xlabel('word rank')
> 	pylab.ylabel('word frequency')
> 	pylab.show()
>=20
> =09
> >>> zif(text)
>=20
> Traceback (most recent call last):
>   File "<pyshell#35>", line 1, in <module>
>     zif(text)
>   File "<pyshell#34>", line 12, in zif
>     pylab.plot(index, y,'b')
>   File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line =
2458, in plot
>     ret =3D ax.plot(*args, **kwargs)
>   File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 3848, =
in plot
>     for line in self._get_lines(*args, **kwargs):
>   File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 323, =
in _grab_next_args
>     for seg in self._plot_args(remaining, kwargs):
>   File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 300, =
in _plot_args
>     x, y =3D self._xy_from_xy(x, y)
>   File "C:\Python27\lib\site-packages\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=20
>=20
> Thanks indeed.
>=20
> --=20
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