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Full Discussion: Sum Column Value
Top Forums Shell Programming and Scripting Sum Column Value Post 302909618 by Rocket on Thursday 17th of July 2014 11:54:20 PM
Old 07-18-2014
Thanks Mike multiplying 100 and dividing by 100 work


Quote:
Originally Posted by Michael Stora
Awk defaults to double. Must be happening in the decimal to binary conversion. Your original data is too how many decimal places?

Try multiplying by 10 or 100 or 1000 before the adding and dividing at the end. Try rounding to a certain precizsion before adding.

Mike

---------- Post updated at 08:07 PM ---------- Previous update was at 07:33 PM ----------

I do floating addition, subtraction, or comparison in BASH all the time by string multiplication and division (moving the decimal point) to convert them to integers.

With a huge file like that your key to speed is going to be avoiding creating and closing subshells in and explicit or implicit loops by calling non built-in utilities. Stick with built-ins only and you will be fast, even with huge files. AWK does not have integers so you're going to have to use BASH.

Using built-in string functions like printf zero pad everything out to the maximum precision, "multiply" by dropping the decimal point, then use integer addition and then at the end "divide" by adding the decimal point back in.

123.45 + 678.9 = (12345 + 67890)/100 All integer math in the loop!

Mike
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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