Hello:
I am new using R.  I have a file that contain in the same columns date and time like for example 2011/10/03 12:34:45.123423 p.m., but when I read the file and display the vector, I see of this way "2011-10-03 12:34:45.123423".  I need to convert the time in a numeric and the date if is possible, but I don't need this to compute.  Thus, I used this  tiempo=substr(time,12,26) to selected the data that I need, but I don't know how I can change this to a  numeric values.
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