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Full Discussion: Taking largest (negative) number from column of coordinates and adding positive form to every other
Top Forums Shell Programming and Scripting Taking largest (negative) number from column of coordinates and adding positive form to every other Post 302561899 by crunchgargoyle on Wednesday 5th of October 2011 01:19:12 PM
Old 10-05-2011
I apologise for the confusion: I treated the four rows independently.

What I want to do is take the largest negative numbers of columns 6-8, make them positive, and add that positive number to every single number in their respective columns.

---------- Post updated at 06:19 PM ---------- Previous update was at 06:13 PM ----------

Quote:
Originally Posted by vgersh99
nawk -f crunch.awk myFile
crunch.awk:
Code:
BEGIN{OFS="\t"; ARGV[ARGC++] = ARGV[1] }
function abs(i) {return (i<0)?-i:i}

FNR==NR{
  for(i=1;i<=NF;i++)
    if ($i<0)
      m[i]=($i<m[i])?$i:m[i]
  next
}
{
  for(i=1;i<=NF;i++)
    if ($i<0)
     $i+=abs(m[i])
  print
}

Thank you very much vgersh99 - that's doing almost exactly what I want. The only tiny thing is that even when numbers are positive in the column, I need them to have the largest negative number added to them if a negative number exists in that column.

I must apologise for these repeated requests and for not explaining myself clearly in the first instance.
 

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LEARN ABOUT LINUX

nextup

NEXTUP(3)						     Linux Programmer's Manual							 NEXTUP(3)

NAME

       nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl - return next floating-point number toward positive/negative infinity

SYNOPSIS

       #define _GNU_SOURCE     /* See feature_test_macros(7) */
       #include <math.h>

       double nextup(double x);
       float nextupf(float x);
       long double nextupl(long double x);

       double nextdown(double x);
       float nextdownf(float x);
       long double nextdownl(long double x);

       Link with -lm.

DESCRIPTION

       The nextup(), nextupf(), and nextupl() functions return the next representable floating-point number greater than x.

       If  x is the smallest representable negative number in the corresponding type, these functions return -0.  If x is 0, the returned value is
       the smallest representable positive number of the corresponding type.

       If x is positive infinity, the returned value is positive infinity.  If x is negative infinity, the returned value is  the  largest  repre-
       sentable finite negative number of the corresponding type.

       If x is Nan, the returned value is NaN.

       The value returned by nextdown(x) is -nextup(-x), and similarly for the other types.

RETURN VALUE

       See DESCRIPTION.

VERSIONS

       These functions first appeared in glibc in version 2.24.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-------------------------------------+---------------+---------+
       |Interface			     | Attribute     | Value   |
       +-------------------------------------+---------------+---------+
       |nextup(), nextupf(), nextupl(),      | Thread safety | MT-Safe |
       |nextdown(), nextdownf(), nextdownl() |		     |	       |
       +-------------------------------------+---------------+---------+
CONFORMING TO

       These functions are described in IEEE Std 754-2008 - Standard for Floating-Point Arithmetic and ISO/IEC TS 18661.

SEE ALSO

       nearbyint(3), nextafter(3)

GNU
								    2017-09-15								 NEXTUP(3)
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