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Top Forums Shell Programming and Scripting Arithmetic operation between columns using loop variable Post 302485346 by Surabhi_so_mh on Wednesday 5th of January 2011 01:55:40 AM
Old 01-05-2011
Arithmetic operation between columns using loop variable

Hi
I have a file with 3 columns. say,
infile:
Code:
1  50   68
34 3   23
23  4  56
-------
-------

I want to generate n files from this file using a loop so that 1st column in output file is (column1 of infile/(2*n+2.561))

I am doing like this:
Code:
for ((i=1; i<=3; i++))
do
  a=`echo "2*$i+2.561" | bc -l`   
  awk '{ printf"%.8f %.8f %.8f\n", ($1/a), $2, $3 }' infile >> out$i
done

but it seems variable a has to be defined within awk. how can I use i in it? Please help

Last edited by Franklin52; 01-05-2011 at 03:51 AM.. Reason: Please use code tags and indent your code, thanks
 

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GRI_MERGE(1)						      General Commands Manual						      GRI_MERGE(1)

NAME
gri_merge - merge multiple Gri output files into a single PostScript file. USAGE (style 1): gri_merge [OPTIONS] CxR a.ps b.ps ... > merged_file.ps Merges the files onto one page, in 'C' columns and 'R' rows. The CxR files are given in the order of words on a page. The page is pre- sumed to be 8.5x11in in size, as are all the input files, and the input files are sized to fit, and kept in natural scale. USAGE (style 2): gri_merge [OPTIONS] xcm ycm enlarge a.ps [b.ps ...] > merged_file.ps Where `enlarge' is a scale factor applied after offsetting `xcm' to the right and `ycm' upward. EXAMPLE (style 2): The following gri_merge 2 12 .5 a.ps 12 12 .5 b.ps 2 2 .5 c.ps 12 2 .5 d.ps > all.ps produces 4 panels from gri plots done using margins and sizes as specified in the following lines in a gri commandfile set x margin 2 set x size 15 set y margin 2 set y size 15 The OPTIONS, available if your 'perl' has 'getopts' library, are: -u graylevel -- set graylevel for underlay beneath panels, by default 0.75. Values range from 0 (black) to 1 (white), although a value of precisely 1 means do NOT draw underlay. -b graylevel -- Set value for background under individual panels, again 0 for black to 1 for white, with 1 meaning no drawing. -h -- Print this help message and quit. SEE ALSO
gri(1), gri_unpage(1) gri_merge 2009 GRI_MERGE(1)
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