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AWK "make a new column that include increasing numbers"

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# 1  
Old 05-20-2012
Data AWK "make a new column that include increasing numbers"
please help!!!!!!
I have a file .txt that has only one column like that:
Code:
34.1
35.5
35.6
45.6

...
Now, i want to add a column in the left in which the values of this column increase by 0.4 , for example:
Code:
0.0  34.1
0.4  35.5
0.8  35.6
1.2  45.6

How can i do with awk instructions???
Many thanks!!!!!!!!
Last edited by Scrutinizer; 05-20-2012 at 08:14 AM.. Reason: code tags
# 2  
Old 05-20-2012
Code:
awk '{printf("%.1f %s\n", 0.4*(NR-1), $0)}' infile

Last edited by Scrutinizer; 05-20-2012 at 08:15 AM.. Reason: code tags
# 3  
Old 05-20-2012
Thank you Kevintse!!!!!!!!!!!!!!! i got it!
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