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Shell Programming and Scripting

converting empty value into NA

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Top Forums Shell Programming and Scripting converting empty value into NA
# 1  
Old 08-27-2012
converting empty value into NA
I have a set of values separated by a tab

Code:
ch:12     1     3     4
ch:13     3     3     4
ch:25     1            8
ch:23     2     8     1

There is a missing value in the third column and i would like replace it with
NA such that the final output would look like

Code:
ch:12     1     3     4
ch:13     3     3     4
ch:25     1     NA   8
ch:23      2     8    1

Thanks in advance
Moderator's Comments:
Mod Comment Please view this code tag video for how to use code tags when posting code and data.
# 2  
Old 08-27-2012
Code:
awk -F"\t" '{ for(N=1; N<=NF; N++) if($N == "") $N="NA" }' input > output

# 3  
Old 08-27-2012
Code:
perl -alnF"\t" -e 'for($i=0;$i<=$#F;$i++){ if(!$F[$i]){$F[$i]="NA";}} print "@F"' input_fiile

# 4  
Old 08-27-2012
Quote:
Originally Posted by msabhi
Code:
perl -alnF"\t" -e 'for($i=0;$i<=$#F;$i++){ if(!$F[$i]){$F[$i]="NA";}} print "@F"' input_fiile

It just gives you an empty file...
# 5  
Old 08-27-2012
I got the below

Code:
$ perl -alnF"\t" -e 'for($i=0;$i<=$#F;$i++){ if(!$F[$i]){$F[$i]="NA";}} print "@F"' file4
ch:12 1 3 4
ch:13 3 3 4
ch:25 1 NA 8
ch:23 2 8 1

Input :
Code:
ch:12^I1^I3^I4$
ch:13^I3^I3^I4$
ch:25^I1^I^I8$
ch:23^I2^I8^I1$

# 6  
Old 08-27-2012
can I ask you one more question?

ch:12 1 3 4
ch:13 3 3 4
ch:25 1 8
ch:23 2 8 1

let's say that 3rd column has 3 fields, but "8" is actually the fourth field, and third field is the value that is missing. then how would you make the 3rd field NA and 8 as the 4th field?
# 7  
Old 08-27-2012
Code:
 perl -alnF"\t" -e 'if($#F==2){$F[3]=$F[2];$F[2]="NA";print "@F"} else {print "@F"}'  input_file

Try this if its given that always third column value is missing and 4th column is third column.
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