Hi,
I have a csv file where head -5 looks like this:
A B C
100 0.45 0.3
67 0.25 0.4
50.6 0.2 0.6
56.4 0.4 0.3
The columns are tab separated. I want to load this CSV file and plot the
histogram of the third or second column. I was able to load the csv file
using this:
data=csv2rec('Downloads/Sample.txt',delimiter='\t',skiprows=0)
The file has 2792 rows including the top header row.
When I do
>> data['A'] I get this error:
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-19-856828b8eaa3> in <module>()
----> 1 data['A']
/Library/Python/2.7/site-packages/numpy-1.9.0.dev_297f54b-py2.7-macosx-10.9-intel.egg/numpy/core/records.pyc
in __getitem__(self, indx)
457
458 def __getitem__(self, indx):
--> 459 obj = ndarray.__getitem__(self, indx)
460 if (isinstance(obj, ndarray) and obj.dtype.isbuiltin):
461 return obj.view(ndarray)
ValueError: field named A not found
First is data['A'] supposed to read the whole A column? Once I read the
column I want to be able to plot it. Can I simply do
>> hist(data['A'],bins=30) or something like that.
Many thanks,
AR
--
View this message in context: http://matplotlib.1069221.n5.nabble.com/Loding-CSV-file-and-plotting-histogram-of-a-particular-column-tp42938.html
Sent from the matplotlib - users mailing list archive at Nabble.com.
Sounds like you want to use pandas, not numpy.
import pandas
import matplotlib.pyplot as plt
df = pandas.read_csv('myfile.txt', sep='\t')
plt.hist(data['A'], bins=30)
...should do it for you.
On Fri, Feb 28, 2014 at 11:06 AM, AR12 <aar...@gm...> wrote:
> Hi,
>
> I have a csv file where head -5 looks like this:
>
> A B C
> 100 0.45 0.3
> 67 0.25 0.4
> 50.6 0.2 0.6
> 56.4 0.4 0.3
>
> The columns are tab separated. I want to load this CSV file and plot the
> histogram of the third or second column. I was able to load the csv file
> using this:
> data=csv2rec('Downloads/Sample.txt',delimiter='\t',skiprows=0)
> The file has 2792 rows including the top header row.
>
> When I do
> >> data['A'] I get this error:
> ---------------------------------------------------------------------------
> ValueError Traceback (most recent call last)
> <ipython-input-19-856828b8eaa3> in <module>()
> ----> 1 data['A']
>
>
> /Library/Python/2.7/site-packages/numpy-1.9.0.dev_297f54b-py2.7-macosx-10.9-intel.egg/numpy/core/records.pyc
> in __getitem__(self, indx)
> 457
> 458 def __getitem__(self, indx):
> --> 459 obj = ndarray.__getitem__(self, indx)
> 460 if (isinstance(obj, ndarray) and obj.dtype.isbuiltin):
> 461 return obj.view(ndarray)
>
> ValueError: field named A not found
>
> First is data['A'] supposed to read the whole A column? Once I read the
> column I want to be able to plot it. Can I simply do
> >> hist(data['A'],bins=30) or something like that.
>
> Many thanks,
> AR
>
>
>
>
> --
> View this message in context:
> http://matplotlib.1069221.n5.nabble.com/Loding-CSV-file-and-plotting-histogram-of-a-particular-column-tp42938.html
> Sent from the matplotlib - users mailing list archive at Nabble.com.
>
>
> ------------------------------------------------------------------------------
> Flow-based real-time traffic analytics software. Cisco certified tool.
> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
> Customize your own dashboards, set traffic alerts and generate reports.
> Network behavioral analysis & security monitoring. All-in-one tool.
>
> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
AR12 wrote:
> Hi,
>
> I have a csv file where head -5 looks like this:
>
> A B C
> 100 0.45 0.3
> 67 0.25 0.4
> 50.6 0.2 0.6
> 56.4 0.4 0.3
>
> The columns are tab separated. I want to load this CSV file and plot the
> histogram of the third or second column. I was able to load the csv file
> using this:
> data=csv2rec('Downloads/Sample.txt',delimiter='\t',skiprows=0)
> The file has 2792 rows including the top header row.
>
> When I do
> >> data['A'] I get this error:
> ---------------------------------------------------------------------------
> ValueError Traceback (most recent call last)
> <ipython-input-19-856828b8eaa3> in <module>()
> ----> 1 data['A']
numpy.csv2rec lowercases the column names.
"If *names* is *None*, a header row is required to automatically
assign the recarray names. The headers will be lower cased,
spaces will be converted to underscores, and illegal attribute
name characters removed. If *names* is not *None*, it is a
sequence of names to use for the column names. In this case, it
is assumed there is no header row."
So data['a'] should do it.
--
Piet van Oostrum <pi...@va...>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]
Thanks, this worked for two of the columns. For the third column, I get
this error: Sorry to bug you about this. Do you know where I can find the
solution to this problem?
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-10-ae5186552dfe> in <module>()
----> 1 plt.hist(df['Confidence'],bins=10)
/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/pyplot.pycin
hist(x, bins, range, normed, weights, cumulative, bottom, histtype, align,
orientation, rwidth, log, color, label, stacked, hold, **kwargs)
2875 histtype=histtype, align=align, orientation=
orientation,
2876 rwidth=rwidth, log=log, color=color, label=
label,
-> 2877 stacked=stacked, **kwargs)
2878 draw_if_interactive()
2879 finally:
/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/axes/_axes.pycin
hist(self, x, bins, range, normed, weights, cumulative, bottom, histtype,
align, orientation, rwidth, log, color, label, stacked, **kwargs)
5477 xmax = -np.inf
5478 for xi in x:
-> 5479 if len(xi) > 0:
5480 xmin = min(xmin, xi.min())
5481 xmax = max(xmax, xi.max())
TypeError: len() of unsized object
On Fri, Feb 28, 2014 at 2:42 PM, Paul Hobson-2 [via matplotlib] <
ml-...@n5...> wrote:
> Sounds like you want to use pandas, not numpy.
>
> import pandas
> import matplotlib.pyplot as plt
> df = pandas.read_csv('myfile.txt', sep='\t')
> plt.hist(data['A'], bins=30)
>
> ...should do it for you.
>
>
> On Fri, Feb 28, 2014 at 11:06 AM, AR12 <[hidden email]<http://user/SendEmail.jtp?type=node&node=42942&i=0>
> > wrote:
>
>> Hi,
>>
>> I have a csv file where head -5 looks like this:
>>
>> A B C
>> 100 0.45 0.3
>> 67 0.25 0.4
>> 50.6 0.2 0.6
>> 56.4 0.4 0.3
>>
>> The columns are tab separated. I want to load this CSV file and plot the
>> histogram of the third or second column. I was able to load the csv file
>> using this:
>> data=csv2rec('Downloads/Sample.txt',delimiter='\t',skiprows=0)
>> The file has 2792 rows including the top header row.
>>
>> When I do
>> >> data['A'] I get this error:
>>
>> ---------------------------------------------------------------------------
>> ValueError Traceback (most recent call
>> last)
>> <ipython-input-19-856828b8eaa3> in <module>()
>> ----> 1 data['A']
>>
>>
>> /Library/Python/2.7/site-packages/numpy-1.9.0.dev_297f54b-py2.7-macosx-10.9-intel.egg/numpy/core/records.pyc
>> in __getitem__(self, indx)
>> 457
>> 458 def __getitem__(self, indx):
>> --> 459 obj = ndarray.__getitem__(self, indx)
>> 460 if (isinstance(obj, ndarray) and obj.dtype.isbuiltin):
>> 461 return obj.view(ndarray)
>>
>> ValueError: field named A not found
>>
>> First is data['A'] supposed to read the whole A column? Once I read the
>> column I want to be able to plot it. Can I simply do
>> >> hist(data['A'],bins=30) or something like that.
>>
>> Many thanks,
>> AR
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://matplotlib.1069221.n5.nabble.com/Loding-CSV-file-and-plotting-histogram-of-a-particular-column-tp42938.html
>> Sent from the matplotlib - users mailing list archive at Nabble.com.
>>
>>
>> ------------------------------------------------------------------------------
>> Flow-based real-time traffic analytics software. Cisco certified tool.
>> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>> Customize your own dashboards, set traffic alerts and generate reports.
>> Network behavioral analysis & security monitoring. All-in-one tool.
>>
>> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
>> _______________________________________________
>> Matplotlib-users mailing list
>> [hidden email] <http://user/SendEmail.jtp?type=node&node=42942&i=1>
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>
>
> ------------------------------------------------------------------------------
>
> Flow-based real-time traffic analytics software. Cisco certified tool.
> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
> Customize your own dashboards, set traffic alerts and generate reports.
> Network behavioral analysis & security monitoring. All-in-one tool.
>
> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
> _______________________________________________
> Matplotlib-users mailing list
> [hidden email] <http://user/SendEmail.jtp?type=node&node=42942&i=2>
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
> ------------------------------
> If you reply to this email, your message will be added to the discussion
> below:
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--
Aarthi Reddy
408-603-1385
--
View this message in context: http://matplotlib.1069221.n5.nabble.com/Loding-CSV-file-and-plotting-histogram-of-a-particular-column-tp42938p42944.html
Sent from the matplotlib - users mailing list archive at Nabble.com.
You have an uppercase 'Confidence'. Are you using pandas or numpy? For numpy, from Piet's email, you need a lowercase key. What does
`print df['Confidence'].shape`
yield? Because the error looks like you have an array with no size (zero dimensions), so perhaps you are still not reading in your file correctly.
-Sterling
On Feb 28, 2014, at 1:02PM, AR12 wrote:
> Thanks, this worked for two of the columns. For the third column, I get this error: Sorry to bug you about this. Do you know where I can find the solution to this problem?
>
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call last)
> <ipython-input-10-ae5186552dfe> in <module>()
> ----> 1 plt.hist(df['Confidence'],bins=10)
>
> /Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/pyplot.pyc in hist(x, bins, range, normed, weights, cumulative, bottom, histtype, align, orientation, rwidth, log, color, label, stacked, hold, **kwargs)
> 2875 histtype=histtype, align=align, orientation=orientation,
> 2876 rwidth=rwidth, log=log, color=color, label=label,
> -> 2877 stacked=stacked, **kwargs)
> 2878 draw_if_interactive()
> 2879 finally:
>
> /Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/axes/_axes.pyc in hist(self, x, bins, range, normed, weights, cumulative, bottom, histtype, align, orientation, rwidth, log, color, label, stacked, **kwargs)
> 5477 xmax = -np.inf
> 5478 for xi in x:
> -> 5479 if len(xi) > 0:
> 5480 xmin = min(xmin, xi.min())
> 5481 xmax = max(xmax, xi.max())
>
> TypeError: len() of unsized object
>
>
> On Fri, Feb 28, 2014 at 2:42 PM, Paul Hobson-2 [via matplotlib] <[hidden email]> wrote:
> Sounds like you want to use pandas, not numpy.
>
> import pandas
> import matplotlib.pyplot as plt
> df = pandas.read_csv('myfile.txt', sep='\t')
> plt.hist(data['A'], bins=30)
>
> ...should do it for you.
>
>
> On Fri, Feb 28, 2014 at 11:06 AM, AR12 <[hidden email]> wrote:
> Hi,
>
> I have a csv file where head -5 looks like this:
>
> A B C
> 100 0.45 0.3
> 67 0.25 0.4
> 50.6 0.2 0.6
> 56.4 0.4 0.3
>
> The columns are tab separated. I want to load this CSV file and plot the
> histogram of the third or second column. I was able to load the csv file
> using this:
> data=csv2rec('Downloads/Sample.txt',delimiter='\t',skiprows=0)
> The file has 2792 rows including the top header row.
>
> When I do
> >> data['A'] I get this error:
> ---------------------------------------------------------------------------
> ValueError Traceback (most recent call last)
> <ipython-input-19-856828b8eaa3> in <module>()
> ----> 1 data['A']
>
> /Library/Python/2.7/site-packages/numpy-1.9.0.dev_297f54b-py2.7-macosx-10.9-intel.egg/numpy/core/records.pyc
> in __getitem__(self, indx)
> 457
> 458 def __getitem__(self, indx):
> --> 459 obj = ndarray.__getitem__(self, indx)
> 460 if (isinstance(obj, ndarray) and obj.dtype.isbuiltin):
> 461 return obj.view(ndarray)
>
> ValueError: field named A not found
>
> First is data['A'] supposed to read the whole A column? Once I read the
> column I want to be able to plot it. Can I simply do
> >> hist(data['A'],bins=30) or something like that.
>
> Many thanks,
> AR
>
>
>
>
> --
> View this message in context: http://matplotlib.1069221.n5.nabble.com/Loding-CSV-file-and-plotting-histogram-of-a-particular-column-tp42938.html
> Sent from the matplotlib - users mailing list archive at Nabble.com.
>
> ------------------------------------------------------------------------------
> Flow-based real-time traffic analytics software. Cisco certified tool.
> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
> Customize your own dashboards, set traffic alerts and generate reports.
> Network behavioral analysis & security monitoring. All-in-one tool.
> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
> _______________________________________________
> Matplotlib-users mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
> ------------------------------------------------------------------------------
> Flow-based real-time traffic analytics software. Cisco certified tool.
> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
> Customize your own dashboards, set traffic alerts and generate reports.
> Network behavioral analysis & security monitoring. All-in-one tool.
> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
> _______________________________________________
> Matplotlib-users mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
> If you reply to this email, your message will be added to the discussion below:
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> To unsubscribe from Loding CSV file and plotting histogram of a particular column, click here.
> NAML
>
>
>
> --
> Aarthi Reddy
> 408-603-1385
>
> View this message in context: Re: Loding CSV file and plotting histogram of a particular column
> Sent from the matplotlib - users mailing list archive at Nabble.com.
> ------------------------------------------------------------------------------
> Flow-based real-time traffic analytics software. Cisco certified tool.
> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
> Customize your own dashboards, set traffic alerts and generate reports.
> Network behavioral analysis & security monitoring. All-in-one tool.
> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk_______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Aarthi,
For me to help further, you will need to provide a sample input file, and the script you are trying to use to read that input file. Then I can go from there.
-Sterling
On Feb 28, 2014, at 1:38PM, Aarthi Reddy wrote:
> It is not an uppercase problem. The other two titles had combination of upper and lower case. All columns have the exact same number of lines and there are no empty entries.
>
> On Feb 28, 2014, at 3:31 PM, Sterling Smith <sm...@fu...> wrote:
>
>> You have an uppercase 'Confidence'. Are you using pandas or numpy? For numpy, from Piet's email, you need a lowercase key. What does
>> `print df['Confidence'].shape`
>> yield? Because the error looks like you have an array with no size (zero dimensions), so perhaps you are still not reading in your file correctly.
>>
>> -Sterling
>>
>> On Feb 28, 2014, at 1:02PM, AR12 wrote:
>>
>>> Thanks, this worked for two of the columns. For the third column, I get this error: Sorry to bug you about this. Do you know where I can find the solution to this problem?
>>>
>>> ---------------------------------------------------------------------------
>>> TypeError Traceback (most recent call last)
>>> <ipython-input-10-ae5186552dfe> in <module>()
>>> ----> 1 plt.hist(df['Confidence'],bins=10)
>>>
>>> /Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/pyplot.pyc in hist(x, bins, range, normed, weights, cumulative, bottom, histtype, align, orientation, rwidth, log, color, label, stacked, hold, **kwargs)
>>> 2875 histtype=histtype, align=align, orientation=orientation,
>>> 2876 rwidth=rwidth, log=log, color=color, label=label,
>>> -> 2877 stacked=stacked, **kwargs)
>>> 2878 draw_if_interactive()
>>> 2879 finally:
>>>
>>> /Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/axes/_axes.pyc in hist(self, x, bins, range, normed, weights, cumulative, bottom, histtype, align, orientation, rwidth, log, color, label, stacked, **kwargs)
>>> 5477 xmax = -np.inf
>>> 5478 for xi in x:
>>> -> 5479 if len(xi) > 0:
>>> 5480 xmin = min(xmin, xi.min())
>>> 5481 xmax = max(xmax, xi.max())
>>>
>>> TypeError: len() of unsized object
>>>
>>>
>>> On Fri, Feb 28, 2014 at 2:42 PM, Paul Hobson-2 [via matplotlib] <[hidden email]> wrote:
>>> Sounds like you want to use pandas, not numpy.
>>>
>>> import pandas
>>> import matplotlib.pyplot as plt
>>> df = pandas.read_csv('myfile.txt', sep='\t')
>>> plt.hist(data['A'], bins=30)
>>>
>>> ...should do it for you.
>>>
>>>
>>> On Fri, Feb 28, 2014 at 11:06 AM, AR12 <[hidden email]> wrote:
>>> Hi,
>>>
>>> I have a csv file where head -5 looks like this:
>>>
>>> A B C
>>> 100 0.45 0.3
>>> 67 0.25 0.4
>>> 50.6 0.2 0.6
>>> 56.4 0.4 0.3
>>>
>>> The columns are tab separated. I want to load this CSV file and plot the
>>> histogram of the third or second column. I was able to load the csv file
>>> using this:
>>> data=csv2rec('Downloads/Sample.txt',delimiter='\t',skiprows=0)
>>> The file has 2792 rows including the top header row.
>>>
>>> When I do
>>>>> data['A'] I get this error:
>>> ---------------------------------------------------------------------------
>>> ValueError Traceback (most recent call last)
>>> <ipython-input-19-856828b8eaa3> in <module>()
>>> ----> 1 data['A']
>>>
>>> /Library/Python/2.7/site-packages/numpy-1.9.0.dev_297f54b-py2.7-macosx-10.9-intel.egg/numpy/core/records.pyc
>>> in __getitem__(self, indx)
>>> 457
>>> 458 def __getitem__(self, indx):
>>> --> 459 obj = ndarray.__getitem__(self, indx)
>>> 460 if (isinstance(obj, ndarray) and obj.dtype.isbuiltin):
>>> 461 return obj.view(ndarray)
>>>
>>> ValueError: field named A not found
>>>
>>> First is data['A'] supposed to read the whole A column? Once I read the
>>> column I want to be able to plot it. Can I simply do
>>>>> hist(data['A'],bins=30) or something like that.
>>>
>>> Many thanks,
>>> AR
>>>
>>>
>>>
>>>
>>> --
>>> View this message in context: http://matplotlib.1069221.n5.nabble.com/Loding-CSV-file-and-plotting-histogram-of-a-particular-column-tp42938.html
>>> Sent from the matplotlib - users mailing list archive at Nabble.com.
>>>
>>> ------------------------------------------------------------------------------
>>> Flow-based real-time traffic analytics software. Cisco certified tool.
>>> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>>> Customize your own dashboards, set traffic alerts and generate reports.
>>> Network behavioral analysis & security monitoring. All-in-one tool.
>>> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
>>> _______________________________________________
>>> Matplotlib-users mailing list
>>> [hidden email]
>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Flow-based real-time traffic analytics software. Cisco certified tool.
>>> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>>> Customize your own dashboards, set traffic alerts and generate reports.
>>> Network behavioral analysis & security monitoring. All-in-one tool.
>>> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
>>> _______________________________________________
>>> Matplotlib-users mailing list
>>> [hidden email]
>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>>
>>>
>>> If you reply to this email, your message will be added to the discussion below:
>>> http://matplotlib.1069221.n5.nabble.com/Loding-CSV-file-and-plotting-histogram-of-a-particular-column-tp42938p42942.html
>>> To unsubscribe from Loding CSV file and plotting histogram of a particular column, click here.
>>> NAML
>>>
>>>
>>>
>>> --
>>> Aarthi Reddy
>>> 408-603-1385
>>>
>>> View this message in context: Re: Loding CSV file and plotting histogram of a particular column
>>> Sent from the matplotlib - users mailing list archive at Nabble.com.
>>> ------------------------------------------------------------------------------
>>> Flow-based real-time traffic analytics software. Cisco certified tool.
>>> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>>> Customize your own dashboards, set traffic alerts and generate reports.
>>> Network behavioral analysis & security monitoring. All-in-one tool.
>>> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk_______________________________________________
>>> Matplotlib-users mailing list
>>> Mat...@li...
>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>