Hi,
X and Y values are stored in a dict whereas X is the key and Y is the
value in the following code:
import matplotlib.pyplot as plt
data = {4: 3, 5: 4, 6: 5, 7: 4, 8: 5}
print data
for i in sorted(data.keys()):
print i
How is possible to use plot with a dict in order to get a similar
picture like this
http://matplotlib.sourceforge.net/_images/invert_axes.png .
Thank you in advance.
In this case, you should be able to use:
plt.plot(data.items())
Mike
On 03/29/2011 09:08 AM, xyz wrote:
> Hi,
> X and Y values are stored in a dict whereas X is the key and Y is the
> value in the following code:
>
> import matplotlib.pyplot as plt
>
> data = {4: 3, 5: 4, 6: 5, 7: 4, 8: 5}
>
> print data
> for i in sorted(data.keys()):
> print i
>
> How is possible to use plot with a dict in order to get a similar
> picture like this
> http://matplotlib.sourceforge.net/_images/invert_axes.png .
>
> Thank you in advance.
>
>
>
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--
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA
Michael Droettboom, on 2011年03月29日 10:12, wrote:
> On 03/29/2011 09:08 AM, xyz wrote:
> > Hi,
> > X and Y values are stored in a dict whereas X is the key and Y is the
> > value in the following code:
> >
> > import matplotlib.pyplot as plt
> >
> > data = {4: 3, 5: 4, 6: 5, 7: 4, 8: 5}
> >
> > print data
> > for i in sorted(data.keys()):
> > print i
> >
> > How is possible to use plot with a dict in order to get a similar
> > picture like this
> > http://matplotlib.sourceforge.net/_images/invert_axes.png .
> In this case, you should be able to use:
>
> plt.plot(data.items())
For me, that line produces two lines with the abscissa going from
0 to 4. In other words, plt.plot(data.items()) ends up being
equivalent to plt.plot(data.values());plt.plot(data.keys())
I think what xyz wants is this:
x,y = zip(*sorted(data.items()))
plt.plot(x,y)
I think of the * in front of arguments to zip as being the pull
tab or slider of the zipper (since it's at the top, you'll be
pulling it down, or unzipping): see
http://docs.python.org/library/functions.html#zip
best,
--
Paul Ivanov
314 address only used for lists, off-list direct email at:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7
On 03/30/2011 05:01 AM, Paul Ivanov wrote:
> Michael Droettboom, on 2011年03月29日 10:12, wrote:
>> On 03/29/2011 09:08 AM, xyz wrote:
>>> Hi,
>>> X and Y values are stored in a dict whereas X is the key and Y is the
>>> value in the following code:
>>>
>>> import matplotlib.pyplot as plt
>>>
>>> data = {4: 3, 5: 4, 6: 5, 7: 4, 8: 5}
>>>
>>> print data
>>> for i in sorted(data.keys()):
>>> print i
>>>
>>> How is possible to use plot with a dict in order to get a similar
>>> picture like this
>>> http://matplotlib.sourceforge.net/_images/invert_axes.png .
>> In this case, you should be able to use:
>>
>> plt.plot(data.items())
> For me, that line produces two lines with the abscissa going from
> 0 to 4. In other words, plt.plot(data.items()) ends up being
> equivalent to plt.plot(data.values());plt.plot(data.keys())
>
> I think what xyz wants is this:
>
> x,y = zip(*sorted(data.items()))
> plt.plot(x,y)
>
> I think of the * in front of arguments to zip as being the pull
> tab or slider of the zipper (since it's at the top, you'll be
> pulling it down, or unzipping): see
> http://docs.python.org/library/functions.html#zip
>
> best,
>
Thank you it works.