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. 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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 > Matplotlib-users@lists.sourceforge.net > 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. 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