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How to substract selective values in multi row, multi column file (using awk or sed?)

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Top Forums Shell Programming and Scripting How to substract selective values in multi row, multi column file (using awk or sed?)
# 1  
Old 10-12-2012
How to substract selective values in multi row, multi column file (using awk or sed?)


I have a problem where I need to make this input:


look like this output:

nameRow1a,text1b,text2a,(floatValue1a - floatValue1b),(floatValue2a - floatValue2b),...,(floatValue140a - floatValue140b)

I thought I could do this in awk, but I can't figure out how to read the 2 lines independently and assign them into arrays, to later be manipulated.

Any help is greatly appreciated, and thanks a lot in advance!
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!

Last edited by vgersh99; 10-12-2012 at 06:54 PM.. Reason: code tags, please!
# 2  
Old 10-12-2012
take a look at the getline man page.

BEGIN {OFS = ",";}
    nLine1 = split($0, Line1, ",");
    $1 = Line1[1]; $3 = Line1[3];
    for (i=4;i<=nLine1;i++) $i = sprintf("(%s-%s)",Line1[i],$i);

# 3  
Old 10-12-2012
Please give us a few pairs of lines of actual data (and be sure to use code tags).

Do the names in the 1st field on the 1st line in a pair always literally end with "a" and do the names in the 1st field on the 2nd line in a pair always literally end with a "b"?

Are the two lines always adjacent in the input with the "a" line before the "b" line?

Do you literally want the expression that would produce the difference between the values or do you want to print the results of evaluating that expression in fields 4 through 140?
# 4  
Old 10-12-2012
awk -f ricardo.awk FS=, OFS=, mySampleFile
n-- {
  printf("%s%c%s%c%s%c", c[1],OFS,$2,OFS,c[3],OFS)
    printf("%.2f%c", c[i] - $i,(i==NF)?ORS:OFS)

# 5  
Old 10-15-2012
Thanks a lot vgersh99, your code did exactly what I was looking for!! And BTW, thanks so much for the quick replies, you guys are awesome! ALso tried scottaazz code and it works as good, but was easier for me to modify into multiple (>2) lines. Thanks again!

Last edited by nricardo; 10-15-2012 at 01:29 PM..
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