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convert string array to interger array in in one line

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convert string array to interger array in in one line

Jagdish rao
hi guys

i have a array like this for e.g

[["0", "0", "0", "0", "0", "3", "3"],
 ["0", "0", "0", "0", "0", "3", "3"],
 ["0", "0", "0", "0", "0", "3", "3"],
 ["0", "3", "0", "0", "0", "0", "3"],
 ["0", "0", "0", "0", "0", "0", "3"]]

how wud i convert to this

[[0, 0, 0, 0, 0, 3, 3],
 [0, 0, 0, 0, 0, 3, 3],
 [0, 0, 0, 0, 0, 3, 3],
 [0, 0, 0, 0, 0, 3, 3],
 [0, 0, 0, 0, 0, 0, 3],
 [0, 0, 0, 0, 0, 0, 3],
 [0, 3, 0, 0, 0, 0, 3],
 [0, 0, 0, 0, 0, 0, 3],

i.e a string array to integer array in 1 line if possible

pls help
--
Posted via http://www.ruby-forum.com/.

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Re: convert string array to interger array in in one line

Stefano Crocco-2
Alle Wednesday 05 November 2008, Jags Rao ha scritto:

> hi guys
>
> i have a array like this for e.g
>
> [["0", "0", "0", "0", "0", "3", "3"],
>  ["0", "0", "0", "0", "0", "3", "3"],
>  ["0", "0", "0", "0", "0", "3", "3"],
>  ["0", "3", "0", "0", "0", "0", "3"],
>  ["0", "0", "0", "0", "0", "0", "3"]]
>
> how wud i convert to this
>
> [[0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 0, 3],
>  [0, 0, 0, 0, 0, 0, 3],
>  [0, 3, 0, 0, 0, 0, 3],
>  [0, 0, 0, 0, 0, 0, 3],
>
> i.e a string array to integer array in 1 line if possible
>
> pls help

a.map{|i| i.map{|s| s.to_i}}

Stefano


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Re: convert string array to interger array in in one line

RichardOnRails
In reply to this post by Jagdish rao
On Nov 5, 8:08 am, Jags Rao <[hidden email]> wrote:

> hi guys
>
> i have a array like this for e.g
>
> [["0", "0", "0", "0", "0", "3", "3"],
>  ["0", "0", "0", "0", "0", "3", "3"],
>  ["0", "0", "0", "0", "0", "3", "3"],
>  ["0", "3", "0", "0", "0", "0", "3"],
>  ["0", "0", "0", "0", "0", "0", "3"]]
>
> how wud i convert to this
>
> [[0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 0, 3],
>  [0, 0, 0, 0, 0, 0, 3],
>  [0, 3, 0, 0, 0, 0, 3],
>  [0, 0, 0, 0, 0, 0, 3],
>
> i.e a string array to integer array in 1 line if possible
>
> pls help
> --
> Posted viahttp://www.ruby-forum.com/.

Maybe this is a little clearer:

aStrings = [["0", "0", "0", "0", "0", "3", "3"],
 ["0", "0", "0", "0", "0", "3", "3"],
 ["0", "0", "0", "0", "0", "3", "3"],
 ["0", "3", "0", "0", "0", "0", "3"],
 ["0", "0", "0", "0", "0", "0", "3"]]

aFixnums = aStrings.map{|i| i.map{|s| s.to_i}}
puts aStrings[0][0].class.to_s # => String
puts aFixnums[0][0].class.to_s # => Fixnum
puts aFixnums[0][0].integer?   # => true (So a Fixnum is_a Integer)

Note that the last line asserts that a Fixnum object is indeed an
Integer

HTH,
Richard

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Re: convert string array to interger array in in one line

Todd Benson-2
In reply to this post by Jagdish rao
On Wed, Nov 5, 2008 at 7:08 AM, Jags Rao <[hidden email]> wrote:

> hi guys
>
> i have a array like this for e.g
>
> [["0", "0", "0", "0", "0", "3", "3"],
>  ["0", "0", "0", "0", "0", "3", "3"],
>  ["0", "0", "0", "0", "0", "3", "3"],
>  ["0", "3", "0", "0", "0", "0", "3"],
>  ["0", "0", "0", "0", "0", "0", "3"]]
>
> how wud i convert to this
>
> [[0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 3, 3],
>  [0, 0, 0, 0, 0, 0, 3],
>  [0, 0, 0, 0, 0, 0, 3],
>  [0, 3, 0, 0, 0, 0, 3],
>  [0, 0, 0, 0, 0, 0, 3],
>
> i.e a string array to integer array in 1 line if possible

Here's a weird one for your enjoyment (arr is your array)...

require 'matrix'; p Matrix[*arr].map {|i| i.to_i}.to_a

...of course, just like Stefano's solution, the object must respond to
the #to_i method.

You can #join it and split it up (#each_slice) again (my first cool
solution, but looks _really_ ugly).  Mapping twice is the easiest and
is the way you probably should go.

Todd

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