[Matplotlib-users] Not able to access CSV file:

[Karthikraja V. <vel...@gm...>]

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