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Full Discussion: Multiplication using bc in a for loop
Top Forums UNIX for Dummies Questions & Answers Multiplication using bc in a for loop Post 302375913 by f_o_555 on Monday 30th of November 2009 08:56:46 AM
Old 11-30-2009
Quote:
Originally Posted by scottn
Hi.

"i" is a variable, so...

Code:
for (( i=1;i<=15;i++)); do
    x=$( printf "%s\n " "scale = 10; $i*5.0*335.0*3.0/1000.0" | bc)
    echo $x $i
done

(and notice the double quotes around the "scale =" string)
yes I had tried with $i but I got an error message

Code:
(standard_in) 1: illegal character: $

With the double qutes is fine, thank you!

---------- Post updated at 08:56 AM ---------- Previous update was at 06:04 AM ----------

Hi again,
I have some problems with 'bc'

Code:
for (( i=1;i<=15;i++)); do
     x=$( printf "%s\n " "scale = 10; $i*5.0*335.0*3.0/1000.0" | bc)
     y=$(/cygdrive/u/TOOLS/extract_v04d 1 yyy1 $i $i S 1 x x)
    dy=$( printf "%s\n " "scale = 10; $y * 0.05" | bc)
    echo $x $x $y $dy $z $dz >> fit.dat
done

in y I have a value that I read with another program from a file. The value of y is correct, but when I try to calculate the 5% of y I get a non sense.
e.g. the output is
Code:
 5.0250000000  5.0250000000 6.324E+08 6.7249 
10.0500000000 10.0500000000 1.304E+09 1.7549 
15.0750000000 15.0750000000 2.185E+09 2.6359 
20.1000000000 20.1000000000 3.248E+09 3.6989

I suppose the meaning of scale in bc is the scale to use to carry out the calculation(10 for decimal)

Does anybody know what am I doing wrong?
Thanks
 

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LEARN ABOUT OSX

locale::codes::langvar

Locale::Codes::LangVar(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangVar(3pm)

NAME

       Locale::Codes::LangVar - standard codes for language variation identification

SYNOPSIS

	  use Locale::Codes::LangVar;

	  $lvar = code2langvar('acm');		       # $lvar gets 'Mesopotamian Arabic'
	  $code = langvar2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langvar_codes();
	  @names   = all_langvar_names();

DESCRIPTION

       The "Locale::Codes::LangVar" module provides access to standard codes used for identifying language variations, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language variations. A code set may be specified using either a name, or
       a constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lvar = code2langvar('en','alpha-2');
	  $lvar = code2langvar('en',LOCALE_CODE_ALPHA_2);

       The codesets currently supported are:

       alpha
	   This is the set of alphanumeric codes from the IANA language registry, such as 'arevela' for Eastern Armenian.

	   This code set is identified with the symbol "LOCALE_LANGVAR_ALPHA".

	   This is the default code set.

ROUTINES

       code2langvar ( CODE [,CODESET] )
       langvar2code ( NAME [,CODESET] )
       langvar_code2code ( CODE ,CODESET ,CODESET2 )
       all_langvar_codes ( [CODESET] )
       all_langvar_names ( [CODESET] )
       Locale::Codes::LangVar::rename_langvar  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangVar::add_langvar  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangVar::delete_langvar  ( CODE [,CODESET] )
       Locale::Codes::LangVar::add_langvar_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangVar::delete_langvar_alias  ( NAME )
       Locale::Codes::LangVar::rename_langvar_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangVar::add_langvar_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangVar::delete_langvar_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2012 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.2							    2012-10-11					       Locale::Codes::LangVar(3pm)
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