Hi,
firstly, I do not fully understand why you have chosen such a complicated
solution to a rather simple problem. If the data in your file really is like
the example then you could simply put the file 'ch1.csv' into the same
directory as your Python script.
I have slightly modified it (I don't like the "from" import statements too
much) and commented your lines.
#from matplotlib import mlab
#from pylab import figure, show
#import matplotlib.cbook as cbook
import pylab
#datafile = cbook.get_sample_data('ch1.csv', asfileobj=False)
datafile = 'ch1.csv'
print 'loading', datafile
#a = mlab.csv2rec(datafile)
a = pylab.loadtxt(datafile, comments='#', delimiter=';')
a.sort()
print a.dtype
fig = pylab.figure()
ax = fig.add_subplot(111)
#ax.plot(a.date, a.adj_close, '-')
#fig.autofmt_xdate()
ax.plot(a, 'o')
fig.show()
I hope it helps, let me know wether you need a different approach!
2011/5/25 Karthikraja Velmurugan <velmurugan.karthikr...@gmail.com>
> Hello friends,
>
>
>
> I am a newbee to matplotlib and I am trying to plot (scatter plot) some
> values. The data is quite big and I have them in a CSV file. For a starter I
> thought I will use *loadrec.py* example to see if I am able to import the
> data from the CSV file. The loadrec.py goes like this:
>
>
>
> from matplotlib import mlab
>
> from pylab import figure, show
>
> import matplotlib.cbook as cbook
>
>
>
> datafile = cbook.get_sample_data('msft.csv', asfileobj=False)
>
> print 'loading', datafile
>
> a = mlab.csv2rec(datafile)
>
> a.sort()
>
> print a.dtype
>
>
>
> fig = figure()
>
> ax = fig.add_subplot(111)
>
> ax.plot(a.date, a.adj_close, '-')
>
> fig.autofmt_xdate()
>
> I believe, for the CSV file to be accessed, it has to be placed in the *
> sample_data* folder (for windows). So I placed my csv file in the
> sample_data folder and ran the script.
>
>
>
> The output was
>
>
>
> *Traceback (most recent call last):*
>
> * File "C:\Python26\loadrec.py", line 5, in <module>*
>
> * datafile = cbook.get_sample_data('ch1.csv', asfileobj=False)*
>
> * File "C:\Python26\Lib\site-packages\matplotlib\cbook.py", line 662, in
> get_sample_data*
>
> * return myserver.get_sample_data(fname, asfileobj=asfileobj)*
>
> * File "C:\Python26\Lib\site-packages\matplotlib\cbook.py", line 620, in
> get_sample_data*
>
> * raise KeyError(msg)*
>
> *KeyError: 'file ch1.csv not in cache; received HTTP Error 404: Not Found
> when trying to retrieve'*
>
>
>
> The data in my CSV file looks like this
>
>
>
> 0.9963
>
> 0
>
> 0.499
>
> 0.9901
>
> 0.0025
>
> 0
>
> 1
>
> 0.0017
>
> 1
>
> 0.0173
>
> 0.9837
>
> If anyone can understand the problem please give me your suggestions. I
> will be very thankful if any of you can show me exactly how to scatter plot
> this kind of data.
>
>
>
> *Karthikraja Velmurugan, *
>
> *Graduate research assistant, *
>
> *Dept of Biomedical Informatics, *
>
> *Arizona State University, *
>
> *248-421-7394*
>
>
>
>
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