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Full Discussion: Add floating point numbers from file
Top Forums UNIX for Dummies Questions & Answers Add floating point numbers from file Post 302520016 by drl on Thursday 5th of May 2011 03:31:58 PM
Old 05-05-2011
Fixed-point
Hi.

To use only bash (compared with awk):
Code:
#!/usr/bin/env bash

# @(#) s1	Demonstrate awk vs bash for fractional addition, fixed-point.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
pe() { for i;do printf "%s" "$i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for i;do printf "%s" "$i";done; printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && . $C

FILE=${1-data1}

pl " Input file $FILE:"
cat $FILE

pl " Results, awk:"
awk '{v+=$1} END{print v}' $FILE

pl " Results, bash (with scaling):"
v2=0
while read line
do
  v1=${line/./}
  pe " Line scaled is :$v1:"
  (( v2+=v1 ))
done <$FILE
v3=${v2%??}
v4=${v2/#$v3/}
pe " total    is :$v2:"
pe " integer  is :$v3:"
pe " fraction is :$v4:"
v5="${v3}.${v4}"
pe " Re-scaled   :$v5:"

exit 0

producing:
Code:
% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.7 (lenny) 
GNU bash 3.2.39

-----
 Input file data1:
490.47
244.61
263.07
131.59
246.81
115.20

-----
 Results, awk:
1491.75

-----
 Results, bash (with scaling):
 Line scaled is :49047:
 Line scaled is :24461:
 Line scaled is :26307:
 Line scaled is :13159:
 Line scaled is :24681:
 Line scaled is :11520:
 total    is :149175:
 integer  is :1491:
 fraction is :75:
 Re-scaled   :1491.75:

See man bash for details and Fixed-point arithmetic - Wikipedia, the free encyclopedia for information on fixed-point ... cheers, drl
 

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LEARN ABOUT PHP

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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