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Full Discussion: Floating point to integer in variable length lines
Top Forums Shell Programming and Scripting Floating point to integer in variable length lines Post 302413276 by jossojjos on Thursday 15th of April 2010 05:45:00 AM
Old 04-15-2010
Floating point to integer in variable length lines
Hi !

I'm looking for a way to transform certain floating point numbers in a one-line, variable length file to integers.

I can do this in a crude way with sed :
Code:
sed -e 's/0\.\([1-9][0-9]\)[0-9]:/\1:/g' -e 's/0\.0\([0-9]\)[0-9]:/\1:/g' -e 's/1\.000:/100:/g' myfile

... but this doesn't handle the rounding correctly.

I'm not very familiar with awk or perl, which are more adapted to arithmetics than sed.
So I can use them to look for my number to replace, but how to get the arithmetics done ?

So far, I can recognize the numbers to change :
Code:
awk  '{gsub(/)[0-9]+\.[0-9]+:/,")boot:")};1' myfile

or :
Code:
perl -pe 's/\)([0-9]+\.[0-9]+):/\)$1*100:/g' myfile

The floating point number to replace is always between a ")" and a ":" ; other numbers should be left unchanged.
So in the awk command, can I replace "boot" with an arithmetic operation ?
In the perl command, how to do the arithmetics and not just printing "0.100*100" ?

Just to give an example of the file, but they can be much more complicated :
Code:
(X1.13:0.39456,X1:0.00014,(Y3:0.01259,(XX:0.18846,YK3:0.14006)1.000:0.73816)0.758:0.01603);

The numbers to be changed are "1.000" and "0.758".

Thanks for reading !
jos
 

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nextafterd32

nextafterd64(3M)														  nextafterd64(3M)

NAME

       nextafterd64(),	nextafterd128(), nextafterd32(), nexttowardd64(), nexttowardd128(), nexttowardd32() - next representable decimal floating-
       point numbers

SYNOPSIS

DESCRIPTION

       The function computes the next representable number following x in the direction toward y.  Thus, if y is less than x, returns the  largest
       representable number less than x.

       The function returns y if x equals y.

       The  function is equivalent to except that the second parameter has the widest decimal floating-point type, and the function returns y con-
       verted to the type of the function if x equals y.

       The result of the function is determined in the type of the function, without loss of range or precision in  a  floating  second  argument,
       whose type may be wider than the type of the function.

       is a version of it takes arguments and returns a result.

       is a version of it takes arguments and returns a result.

       is a version of it takes a first argument and returns a result.

       is a version of it takes a first argument and returns a result.

       These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.

USAGE

       To use any of these functions, compile with the option.

       Make sure your program defines and then includes

       Link in the math library by specifying or on the linking command line.

       For more information, see the at the following site:

RETURN VALUE

       If x equals y, returns y, and returns y converted to the type of x.

       If x is finite and the correct function value would overflow, these functions return according to the sign of x, and raise the overflow and
       inexact floating-point exceptions.

       If the return value is subnormal and x!=y, these functions raise the underflow and inexact floating-point exceptions.

       If x or y is NaN, these functions return NaN.

ERRORS

       If x is finite and the correct function value would overflow, these functions set to

SEE ALSO

       scalbnd64(3M), math(5).

STANDARDS CONFORMANCE

       These functions conform to ISO/IEC TR 24732, "Extension for the programming language C to support decimal floating-point arithmetic".

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