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Calculation with floats

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# 1  
Old 11-11-2010
Calculation with floats
I want to make computations using floats. This cannot be done with csh. ksh seem to have a problem as well. What is good shell for computations without having to resort to bc or awk? How about python?
# 2  
Old 11-11-2010
So how about perl?
# 3  
Old 11-11-2010
This worked for me with ksh.

fa=12.123
fb=21.321
ans=$(($fa*$fb))

Are there any restrictions of floating point calculations in ksh?

---------- Post updated at 07:01 PM ---------- Previous update was at 07:00 PM ----------

I thought I move away from perl in favour of python. Any opinions?
# 4  
Old 11-11-2010
Float Manipulation with Perl
This will multiply two floats and print the result. You can modify the precision and padding by changing the FORMAT in the printf() statement. perldoc -f sprintf
Code:
printf "%f\n", $f1 * $f2;

Maybe that can tie you over until you get the desired answer in python.
# 5  
Old 11-11-2010
Quote:
Originally Posted by kristinu
This worked for me with ksh.

fa=12.123
fb=21.321
ans=$(($fa*$fb))

Are there any restrictions of floating point calculations in ksh?

---------- Post updated at 07:01 PM ---------- Previous update was at 07:00 PM ----------

I thought I move away from perl in favour of python. Any opinions?

Ksh dosn't work correctly for me:

Code:
$ echo $((2.9 * 1.9))
2

Also why not use bc it's much smaller than python/perl/awk?

Code:
$ size /usr/bin/bc /usr/bin/awk /usr/bin/perl
/usr/bin/bc: 13568 + 10344 + 41392 + 3876 = 69180
/usr/bin/awk: 86520 + 64696 + 419848 + 18802 = 589866
/usr/bin/perl: 1072227 + 45157 + 2941 + 122652 = 1242977

# 6  
Old 11-12-2010
Floating point arithmetic is fully part of ksh93, but not ksh88.

Code:
$ ksh --version
  version         sh (AT&T Research) 93t+ 2009-05-01
$ echo $((2.9 * 1.9))
5.51

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