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Full Discussion: Extract certain columns from big data
Top Forums Shell Programming and Scripting Extract certain columns from big data Post 302821581 by happypoker on Friday 14th of June 2013 05:29:27 PM
Old 06-14-2013
Quote:
Originally Posted by rveri
happypoker,
You can use gnu awk and use array for the desired columns to store and print the data.
Thank you! I'm able to get the list column # into an array, but still don't know how to print those corresponding columns out.

The data is something like:
Code:
000 A B C D 2.22 3.4 1.03 .....
001 B F S D 3.2 2.1 3.2 2.3 .....
....
...
132 F S F X 2.3 3.4 5.3 2.1 ....

It has about 6600 columns and 30,000,000 lines. It's too big to put the needed columns in some array, I have to print the needed columns line by line.
Last edited by Scrutinizer; 06-17-2013 at 03:10 AM.. Reason: code tags
 

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LEARN ABOUT LINUX

envext

ENVEXT(1)						  The Canonical Csound Reference						 ENVEXT(1)

NAME

       envext - Extracts the envelope of a file to a text file. .

SYNTAX

	   envext [-flags] soundfile

	   csound -U envext [-flags] soundfile

INITIALIZATION

       soundfile - Name of the input soundfile.

       The following flags are available for envext (The default values are stated in parenthesis):
	   -o fnam Name of output filename (newenv)
	   -w size (in seconds) of analysis window (0.25)

       The envext utility generates a text file containing time and amplitude pairs by finding the absolute peak within each window.

EXAMPLE

       Using the command (while in the manual directory):

	   csound -U envext examples/mary.wav

       will produce the a text file containing the following:

	     0.000   0.000
	     0.000   0.000
	     0.250   0.000
	     0.500   0.000
	     0.750   0.000
	     1.249   0.170
	     1.499   0.269
	     1.530   0.307
	     1.872   0.263
	     2.056   0.304
	     2.294   0.241
	     2.570   0.216
	     2.761   0.178
	     3.077   0.011
	     3.251   0.001
	     3.500   0.000

       Which shows the time for the peak amplitude within each measured window.

CREDITS

       Author: John ffitch

       1995

AUTHORS

       Barry Vercoe
       MIT Media Lab

	   Author.

       Dan Ellis
       MIT Media Lab,
		 Cambridge
		 Massachussetts

	   Author.

COPYRIGHT

5.07								    06/23/2009								 ENVEXT(1)
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