Hi, the content of the CSV is stored as an array after reading. You can simply access rows and columns like in Matlab:
firstrow = a1[0] firstcol = a1.T[0] The .T transposes the array. The second element of the third row would be elem32 = a1[2][1] which is equivalent to elem32 = a1[2,1] A range of e.g. rows 3 to 6 is range36 = a1[2:6] Please have a look here for getting started with scipy/numpy: http://pages.physics.cornell.edu/~myers/teaching/ComputationalMethods/python/arrays.html and http://www.scipy.org/NumPy_for_Matlab_Users Hope this helps, Daniel 2011/5/27 Karthikraja Velmurugan <velmurugan.karthikr...@gmail.com>: > Hello Daniel, > > The code you have given is simple and works fab. Thank you very much. But I > wasn't able to find an example which accesses the columns of a CSV files > when I import data through "datafile="filename.csv"" option. It will be > great if you could help with accessing individual columns. What excatly I am > looking for is to access individual coulmns (of the same CSV file), do > calculations using the two coumns and plot them into seperate subplots of > the same graph. > I modified the script a lil bit. Please find it below: > > import matplotlib.pyplot as plt > import pylab > datafile1 = 'ch1_s1_lrr.csv' > datafile2 = 'ch1_s1_baf.csv' > a1 = pylab.loadtxt(datafile1, comments='#', delimiter=';') > b1 = pylab.loadtxt(datafile2, comments='#', delimiter=';') > v1 = [0,98760,0,1] > v2 = [0,98760,-2,2] > plt.figure(1) > plt.subplot(4,1,1) > print 'loading', datafile1 > plt.axis(v2) > plt.plot(a1, 'r.') > plt.subplot(4,1,2) > print 'loading', datafile2 > plt.axis(v1) > plt.plot(b1, 'b.') > plt.show() > > Thank you very much in advance for your time and suggestions. > > Karthik ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
