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Full Discussion: Copy last few lines of a file, perform math operation and iterate further
Top Forums UNIX for Beginners Questions & Answers Copy last few lines of a file, perform math operation and iterate further Post 303031204 by vgersh99 on Saturday 23rd of February 2019 01:45:30 PM
Old 02-23-2019
see if it helps.
If sapa.txt is:
Code:
4 0 1 642 643
4 642 643 1283 1284
4 1283 1284 1924 1925
4 1924 1925 2565 2566
4 2565 2566 3206 3207
4 3206 3207 3847 3848
4 3847 3848 4488 4489
4 4488 4489 5129 5130

running awk -v rep=3 -f sapa.awk sapa.txt
where
sapa.awk is:
Code:
BEGIN {
  if (!rep) rep=5
}
{
   for(i=1;i<=NF;i++)
      a[FNR%8,i]=$i
   nf=NF
}
1
END {
   print "---"
   for(cnt=1;cnt<=rep;cnt++)  {
     for(row=1;row<=8;row++) {
       printf("%s%s", $1, OFS)
       for(i=2;i<=nf;i++)
         printf("%s%s", ++a[row%8,i], (i==nf)?ORS:OFS)
     }
     print "---"
   }
}

produces:
Code:
4 0 1 642 643
4 642 643 1283 1284
4 1283 1284 1924 1925
4 1924 1925 2565 2566
4 2565 2566 3206 3207
4 3206 3207 3847 3848
4 3847 3848 4488 4489
4 4488 4489 5129 5130
---
4 1 2 643 644
4 643 644 1284 1285
4 1284 1285 1925 1926
4 1925 1926 2566 2567
4 2566 2567 3207 3208
4 3207 3208 3848 3849
4 3848 3849 4489 4490
4 4489 4490 5130 5131
---
4 2 3 644 645
4 644 645 1285 1286
4 1285 1286 1926 1927
4 1926 1927 2567 2568
4 2567 2568 3208 3209
4 3208 3209 3849 3850
4 3849 3850 4490 4491
4 4490 4491 5131 5132
---
4 3 4 645 646
4 645 646 1286 1287
4 1286 1287 1927 1928
4 1927 1928 2568 2569
4 2568 2569 3209 3210
4 3209 3210 3850 3851
4 3850 3851 4491 4492
4 4491 4492 5132 5133
---

These 3 Users Gave Thanks to vgersh99 For This Post:
Neo RudiC SaPa
 

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LEARN ABOUT MINIX

math

math(n)                                                          Tcl Math Library                                                          math(n)

__________________________________________________________________________________________________________________________________________________

NAME

       math - Tcl Math Library

SYNOPSIS

       package require Tcl  8.2

       package require math  ?1.2.4?

       ::math::cov value value ?value ...?

       ::math::integrate list of xy value pairs

       ::math::fibonacci n

       ::math::max value ?value ...?

       ::math::mean value ?value ...?

       ::math::min value ?value ...?

       ::math::product value ?value ...?

       ::math::random ?value1? ?value2?

       ::math::sigma value value ?value ...?

       ::math::stats value value ?value ...?

       ::math::sum value ?value ...?

_________________________________________________________________

DESCRIPTION

       The math package provides utility math functions.

       Besides a set of basic commands, available via the package math, there are more specialised packages:

       o      math::bigfloat - Arbitrary-precision floating-point arithmetic

       o      math::bignum - Arbitrary-precision integer arithmetic

       o      math::calculus::romberg - Robust integration methods for functions of one variable, using Romberg integration

       o      math::calculus - Integration of functions, solving ordinary differential equations

       o      math::combinatorics - Procedures for various combinatorial functions (for instance the Gamma function and "k out of n")

       o      math::complexnumbers - Complex number arithmetic

       o      math::constants - A set of well-known mathematical constants, such as Pi, E, and the golden ratio

       o      math::fourier - Discrete Fourier transforms

       o      math::fuzzy - Fuzzy comparisons of floating-point numbers

       o      math::geometry - 2D geometrical computations

       o      math::interpolate - Various interpolation methods

       o      math::linearalgebra - Linear algebra package

       o      math::optimize - Optimization methods

       o      math::polynomials - Polynomial arithmetic (includes families of classical polynomials)

       o      math::rationalfunctions - Arithmetic of rational functions

       o      math::roman - Manipulation (including arithmetic) of Roman numerals

       o      math::special - Approximations of special functions from mathematical physics

       o      math::statistics - Statistical operations and tests

BASIC COMMANDS

       ::math::cov value value ?value ...?
              Return the coefficient of variation expressed as percent of two or more numeric values.

       ::math::integrate list of xy value pairs
              Return the area under a "curve" defined by a set of x,y pairs and the error bound as a list.

       ::math::fibonacci n
              Return the n'th Fibonacci number.

       ::math::max value ?value ...?
              Return the maximum of one or more numeric values.

       ::math::mean value ?value ...?
              Return the mean, or "average" of one or more numeric values.

       ::math::min value ?value ...?
              Return the minimum of one or more numeric values.

       ::math::product value ?value ...?
              Return the product of one or more numeric values.

       ::math::random ?value1? ?value2?
              Return a random number.  If no arguments are given, the number is a floating point value between 0 and 1.  If one argument is given,
              the number is an integer value between 0 and value1.  If two arguments are given, the number is an integer value between value1  and
              value2.

       ::math::sigma value value ?value ...?
              Return the population standard deviation of two or more numeric values.

       ::math::stats value value ?value ...?
              Return the mean, standard deviation, and coefficient of variation (as percent) as a list.

       ::math::sum value ?value ...?
              Return the sum of one or more numeric values.

BUGS, IDEAS, FEEDBACK
       This  document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category math of
       the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you  may  have  for
       either package and/or documentation.

KEYWORDS

       math, statistics

math                                                                   1.2.4                                                               math(n)
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