09-25-2014
You're welcome. It is not entirely surprising.. If the variable a is not initialized then it is the empty string ("").. So $a becomes $"".
Some awks may interpret it in a numerical context and change it to 0 and so it turns into $0 (which is the record), which would give the proper answer, but it would work differently from what you might expect...
Other awks may not accept $"" and raise an error message
Yet other awks may assign it to $0 (because it is a numerical context), but reference $"" which may return 0, etc...
It is an ambiguous situation and it really depends on the specific awk implementation how this improper use of the variable gets handled..
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LEARN ABOUT DEBIAN
maphimbu
MAPHIMBU(1) User Commands MAPHIMBU(1)
NAME
maphimbu - histogram builder for 1-d numerical and text data
SYNOPSIS
maphimbu [OPTION]... [FILE]
DESCRIPTION
This program produces 1-d histograms from numerical or text data input. It can be also used to estimate the probability distribution func-
tion of a numerical variable - see http://en.wikipedia.org/wiki/Probability_density_function.
OPTIONS
-x <int>
x-data column (default is 1)
-y <int>
y-data column (default is 2); It is considered only when combined with '-m' or '-S'
-d <float|int>
delta size (dx-resolution) in case of numerical data; Keep in mind that 2 is not the same as 2.0: in the first case the numbers are
treated as integers, in the latter as floats.
-n normalize the result A) non-numerical data: n(x) = counts(x)/sum_of_counts B) numerical data: the normalized probability density
func.
is P(-INF < x <INF) = Int_[-INF:INF] P(x)*dx = 1 ; For the numerical integration an open x-data interval is assumed.
-N normalize data against the total sum of counts (same as option '-n' with case A forced)
-U normalize the result with x-range mapped to unit; The x-values are mapped to the interval [0:1], respectively Int_[0:1] P(x)*dx = 1;
This option is mutually exclusive with '-n'.
-S compute sums and normalized sums of y-values; The total sum of all y-values is used for the normalization.
-m compute the arithmetic mean of y-values in the respective x-bar
-s <int>
sort output using the specified column; Header is skipped in this case.
-g <int>
sort output numerically using the specified column; Header is skipped in this case.
-r do reverse sorting (in combination with '-g' and '-s')
-C center histogram bars (shifts x-axis by 0.5*dx)
-X treat hole line as one string (single data record)
-H print a data description header
-V print program version and exit
--version
output version and copyright information
--help display help
-h display short help (options summary)
Note: this program is not intended for use in high order numerical computations.
REPORTING BUGS
Report bugs to <gnu@mirendom.net>
COPYRIGHT
Copyright (C) 2003-2007, 2009, 2011 Dimitar Ivanov
License: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
maphimbu 2.8.4 February 2012 MAPHIMBU(1)