From: thiel <schang@...>
Date: 2008-11-04T22:58:12+09:00
Subject: Re: [?? Probable Spam]  Re: How to print an array with floating point numbers?

Hi Josef,

Many  thanks for your advice. Solving the problem with your suggestion 
was quite trivial (at last :-) )

I ran into problems because I used a wrong multi dimensional array 
definition from the book B. Preissig  and changed it into :

--------------------------------------
def Test.mda(width,height)
    Array.new(width).map!{ Array.new(height) }
  end
 
  x = Test.mda(6,2)

# Some test data

  x[0][0] = 55.123
  x[1][0] = 39.234
  x[2][0] = 41.897
  x[3][0] = 40.456
  x[4][0] = 47.234
  x[5][0] = 51.567
 

  x[0][1] = 1
  x[1][1] = 2
  x[2][1] = 3
  x[3][1] = 4
  x[4][1] = 5
  x[5][1] = 6

# And the testprogram

 x = x.sort {|v1, v2 | v2 <=> v1}

  for m in 0 .. 5
    if x[m][0] >= x[2][0] then
      printf("Greater %3.3f\n", x[m][0])
    else
      printf("Smaller %3.3f \n", x[m][0] )
    end
  end
  puts "Smallest value = #{x[5][0].to_s}"

  ------------------------------------

And it works fine.

Best regards,

Thiel

Josef 'Jupp' Schugt schreef:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">On Tue, 
> 04 Nov 2008 11:12:31 +0100, thiel <schang@wxs.nl> wrote:
>
>> Can anyone tell me how I can print an array with floating point numbers?
>
> printf:
>
> [0.1, 2.3, 4.5, 6.7, 8.9].each { |x| printf("%0.04f\n",x)}
> 0.1000
> 2.3000
> 4.5000
> 6.7000
> 8.9000
>
> puts and '%':
>
> [0.1, 2.3, 4.5, 6.7, 8.9].each { |x| puts "%0.04f" % x}
> 0.1000
> 2.3000
> 4.5000
> 6.7000
> 8.9000
>
> For multidimensional arrays you need to decide in which order you 
> iterate over the indices. There's more than one convention to do so. 
> Typical order 1: The inner loop iterates over the first, the next 
> outermost loop over the second   index, and so on.
> Typical order 2: The inner loop iterates over the last,  the next 
> outermost loop over the previous index, and so on.
>
> HTH,
>
> Josef 'Jupp' Schugt