From: Glenn Jackman <glennj@...>
Date: 2009-09-29T00:30:05+09:00
Subject: Re: format problem

At 2009-09-28 09:38AM, "Li Chen" wrote:
>  c=[  ['a','b','c'],['c1',2,1],['d1',3,4]    ]
>  c.collect!{|row| row<<"\n"}
>  
>  File.open('test.txt','w') do |a_file|
>  c.each do |row|
>          row.each {|e| ("#{e}"=~/[a-zA-Z]|\n/)  ?
>  (a_file.printf("%s\t",e))  :  ( a_file.printf("%.2f\t",e))  }
>  end
>  end

You might try checking if the element is a number, otherwise treat it as
a string:

    c.each do |row|
      row.each do |elem|
        fmt = Numeric === elem ? "%.2f\t" : "%s\t"
        a_file.printf(fmt, elem)
      end
      a_file.puts
    end

>  ########output#############
>  
>  
>  a  b  c
>    c1  2.00  1.00
>    d1  3.00  4.00
>  
>  
>  ####expected as follow########
>  a  b  c
>  c1  2.00  1.00
>  d1  3.00  4.00


-- 
Glenn Jackman
    Write a wise saying and your name will live forever. -- Anonymous