[SOLVED] Awk one line to sum up a function


 
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Old 08-02-2011
[SOLVED] Awk one line to sum up a function

I need help with debugging an error in my awk script.

I have a shell script with variable named U_new_i and want to pass it to awk for use in a summation. The original file have the following content.

Code:
cat test.txt
-2445.7132000000 
-2444.9349000000 
-2444.3295000000 
-2443.1814000000 
-2442.6894000000 
-2445.0234000000 
-2444.7423000000 
-2443.4350000000 
-2444.6649000000

U_new_i = -2443.1814000000 which is the 4th record in test.txt
So I obtained
Code:
U_new_i=`head -4 test.txt | tail -1 | awk '{print $1}'`

I now want to sum up a function using U_new_i as a reference point as follow

Code:
beta=7.9103744257373072296954995748236 

W_new=`tail -8 test.txt | awk -v U_new_i="$U_new_i" '{ W_new += exp(-$beta*(U_new_i - $1))} END { print  W_new }'`

echo W_new = $W_new

I keep getting an error shown below, which is an indication of awk having problem with passing U-new_i correctly. Any help would be appreciated.

Code:
awk: (FILENAME=- FNR=5) warning: exp: argument -3882.6 is out of range
awk: (FILENAME=- FNR=6) warning: exp: argument -1358.53 is out of range
awk: (FILENAME=- FNR=8) warning: exp: argument 2321.12 is out of range
W_new = inf

---------- Post updated at 11:53 AM ---------- Previous update was at 09:45 AM ----------

I found the bug; beta="$beta" needed to be pass to awk as well. Just a total neglect on my part.

Thanks.

---------- Post updated at 11:55 AM ---------- Previous update was at 11:53 AM ----------

I found the bug, beta also needed to be pass as a variable to awk. Just a total negligence on my part.

Last edited by radoulov; 08-02-2011 at 04:01 PM.. Reason: Code tags.
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