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using bc with floating point number in files

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# 1  
Old 01-28-2009
using bc with floating point number in files
Hi,
I' using bash and I would like to use "bc" to compute the ratio of of two numbers and assign the ratio to a variable.
The numbers are in a file, e.g.
196.304492
615.348986

Any idea how to do it?
N.B. I cannot change the file to have 196.304492 / 615.348986 as the file is produced by another code.

Thank you for your help,
Sarah
# 2  
Old 01-28-2009
Code:
bash-3.00$ bc
scale=10
196.304492/615.348986
.3190132696

or

Code:
bash-3.00$  printf "%s\n" 'scale = 10; 196.304492/615.348986' | bc
.3190132696

or even:
Code:
bash-3.00$ x=$( printf "%s\n" 'scale = 10; 196.304492/615.348986' | bc)
bash-3.00$ echo $x
.3190132696


HTH
# 3  
Old 01-28-2009
Maybe I was not clear enough, the numbers are in a file containing these 2 numbers, one in each line.
So my guess would be that I need somehow to create a file or a string from the content of the file...but I can't figure out how.
Thank you,
# 4  
Old 01-28-2009
Option 1:
Code:
$( cat file | tr '\n' '/'|sed -e 's#/$#\n#'|bc )

Option 2:
Code:
$( cat file |perl -e '@v=<>; print $v[0]/$v[1];' )

# 5  
Old 01-28-2009
I would like to try something like Option 1 of pludi
however it seems not to work, maybe because in the file I have a new line character after each number.
# 6  
Old 01-28-2009
The first one should work, since the tr takes care of the newline. If the file is generated with MS-DOS/Windows style line terminators, modify the line to read
Code:
cat file | tr '\r' ' ' |tr '\n' '/'|sed -e 's#/$#\n#'

# 7  
Old 01-28-2009
I'm lost.

in tmp.tmp1 I managed to have something like
Quote:
196.304492
/
615.348986
in the script I have

Quote:
cat tmp.tmp1 | tr -d '\n\' > tmp.tmp2
dos2unix tmp.tmp2 > tmp.tmp3
ratio=$(cat tmp.tmp3 | bc -l)
echo $ratio
but it won't work!
Last edited by f_o_555; 01-28-2009 at 11:09 AM..
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