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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LEARN ABOUT OPENSOLARIS
igawk
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).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWgawk |
+--------------------+-----------------+
|Interface Stability | Volatile |
+--------------------+-----------------+
NOTES
Source for gawk is available on http://opensolaris.org.
Free Software Foundation Nov 3 1999 IGAWK(1)