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error "awk: (FILENAME=- FNR=23) fatal: division by zero attempted"

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# 1  
Old 05-10-2009
Question error "awk: (FILENAME=- FNR=23) fatal: division by zero attempted"
Hi ,

I have file :
Quote:
16 0
27 0
26 0
44 0
28 0
23 0
187 0
14 1
98 1
41 0
47 0
61 0
78 2
40 0
105 1
175 1
175 0
67 0
118 0
30 0
149 1
210 1
0 0
0 0
112 0
after i run this command :
Quote:
cat file | awk '{print $3" ,"100*($3/($3+$4))" ,"}'
there are error
Quote:
16 ,100 ,
27 ,100 ,
26 ,100 ,
44 ,100 ,
28 ,100 ,
23 ,100 ,
187 ,100 ,
14 ,93.3333 ,
98 ,98.9899 ,
41 ,100 ,
47 ,100 ,
61 ,100 ,
78 ,97.5 ,
40 ,100 ,
105 ,99.0566 ,
175 ,99.4318 ,
175 ,100 ,
67 ,100 ,
118 ,100 ,
30 ,100 ,
149 ,99.3333 ,
210 ,99.5261 ,
awk: (FILENAME=- FNR=23) fatal: division by zero attempted
can we print blank line if output error ??

thanks.. ^^
# 2  
Old 05-10-2009
i don't see where you have a third or fourth column.
# 3  
Old 05-10-2009
oops sorry should be like this :
Quote:
cat file | awk '{print $1" ,"100*($1/($1+$2))" ,"}'
# 4  
Old 05-11-2009
skin the useless cat.
Code:
awk '$1!=0 || $2!=0{print $1" ,"100*($1/($1+$2))" ,"}' file

# 5  
Old 05-11-2009
yap thanks.. but we should print $1
so we missing $1 in line 23 and 24 ??

Quote:
16 ,100 ,
27 ,100 ,
26 ,100 ,
44 ,100 ,
28 ,100 ,
23 ,100 ,
187 ,100 ,
14 ,93.3333 ,
98 ,98.9899 ,
41 ,100 ,
47 ,100 ,
61 ,100 ,
78 ,97.5 ,
40 ,100 ,
105 ,99.0566 ,
175 ,99.4318 ,
175 ,100 ,
67 ,100 ,
118 ,100 ,
30 ,100 ,
149 ,99.3333 ,
210 ,99.5261 ,
------>> line 23 and 24
112 ,100 ,
can we print blank line for this case ?
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