From: "baptiste Auguié" <ba208@...>
Date: 2007-10-18T02:04:54+09:00
Subject: Re: extracting values from consecutive lines

thanks so much!

I'll try and use this array with rgsl now...

Best regards,

baptiste

On 17 Oct 2007, at 17:25, Phrogz wrote:

> On Oct 17, 10:03 am, baptiste Auguié <ba...@exeter.ac.uk> wrote:
>>> angle          value1            value2
>>
>>> 156.00        3.3688E-03        1.7040E-03
>>> 157.00        3.2919E-03        1.7118E-03
>>> 158.00        3.2140E-03        1.7190E-03
>>> 159.00        3.1354E-03        1.7258E-03
>>> 160.00        3.0560E-03        1.7320E-03
>>> 161.00        2.9760E-03        1.7378E-03
>>> 162.00        2.8956E-03        1.7431E-03
>>> 163.00        2.8148E-03        1.7479E-03
>>> 164.00        2.7338E-03        1.7523E-03
>>> 165.00        2.6526E-03        1.7562E-03
>>> 166.00        2.5714E-03        1.7597E-03
>>> 167.00        2.4902E-03        1.7628E-03
>>
>> I would like to extract the 3 columns of data for several consecutive
>> lines (say, from angle = 158 to 165). These values should be stored
>> in some array or vector. How can I do that in Ruby?
>
> # Make an array of arrays of numbers
> # based on scanning for non-whitespace characters
> # (all strings will show up as 0.0)
> values = IO.readlines( 'input.dat' ).map{ |line|
>   line.scan( /\S+/ ).map{ |str| str.to_f }
> }
>
> my_range = values.select{ |angle, _|
>   (158..165).include?( angle )
> }
>
> require 'pp'
> pp my_range
> #=> [[158.0, 0.003214, 0.001719],
> #=>  [159.0, 0.0031354, 0.0017258],
> #=>  [160.0, 0.003056, 0.001732],
> #=>  [161.0, 0.002976, 0.0017378],
> #=>  [162.0, 0.0028956, 0.0017431],
> #=>  [163.0, 0.0028148, 0.0017479],
> #=>  [164.0, 0.0027338, 0.0017523],
> #=>  [165.0, 0.0026526, 0.0017562]]
>
>

_____________________________

Baptiste Auguié

Physics Department
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK

Phone: +44 1392 264187

http://newton.ex.ac.uk/research/emag
http://projects.ex.ac.uk/atto
______________________________