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comp.lang.ruby

help with reading part of textfile into matrix

rgilaard

5/10/2005 11:08:00 AM

Dear all,

I am new to Ruby and I'm looking for a way to use Ruby (1.8) to read a part of
a textfile into a matrix.

The textfile lokks like:

=== Confusion Matrix ===

a b c <-- classified as
7494 4044 100 | a = WEL
2039 18691 11 | b = NIET
707 293 441 | c = NOOIT

So what i want is that this matrix is read into a matrix variable in a ruby
program which I can use then to manipulate in every way I want.

Can someone help me with this?

I figured out that I could maybe use a regexp /\s*a\s*/ to search for the line
with a b c
Then I skip that line and start to read the following line position by position
into the first row of the 3-by-3 matrix.

How could this be done?

Thanks in advance,
Robert Gilaard
3 Answers

Brian Schröder

5/10/2005 1:48:00 PM

0

On 10/05/05, rgilaard@few.vu.nl <rgilaard@few.vu.nl> wrote:
> Dear all,
>
> I am new to Ruby and I'm looking for a way to use Ruby (1.8) to read a part of
> a textfile into a matrix.
>
> The textfile lokks like:
>
> === Confusion Matrix ===
>
> a b c <-- classified as
> 7494 4044 100 | a = WEL
> 2039 18691 11 | b = NIET
> 707 293 441 | c = NOOIT
>
> So what i want is that this matrix is read into a matrix variable in a ruby
> program which I can use then to manipulate in every way I want.
>
> Can someone help me with this?
>
> I figured out that I could maybe use a regexp /\s*a\s*/ to search for the line
> with a b c
> Then I skip that line and start to read the following line position by position
> into the first row of the 3-by-3 matrix.
>
> How could this be done?
>
> Thanks in advance,
> Robert Gilaard
>

Confused? ;-)

$ cat confusion.rb
matrix = []

DATA.each do | line |
if /^((?:\s+(?:\d+))+)/ =~ line
matrix << $1.split.map{|value| value.to_i}
end
end

p matrix

__END__
a b c <-- classified as
7494 4044 100 | a = WEL
2039 18691 11 | b = NIET
707 293 441 | c = NOOIT

$ ruby confusion.rb
[[7494, 4044, 100], [2039, 18691, 11], [707, 293, 441]]

regards,

Brian Schröder

--
http://ruby.brian-sch...

multilingual _non rails_ ruby based vocabulary trainer:
http://www.vocabu... | http://www.g... | http://www.vok...

rgilaard

5/10/2005 2:59:00 PM

0

Oof course I am confused a s a ruby newbie!!

However,
I've made this out of your post:
matrix = []

DATA = File.new("testfile.txt", "r")
DATA.each do | line |
if /^((?:\s+(?:\d+))+)/ =~ line
matrix << $1.split.map{|value| value.to_i}
end
end

p matrix
puts matrix[2,2]
DATA.close

But this gives me as result
707
293
441

while I would expect 441.

What is going on?

Brgds
Robert

Quoting Brian Schröder <ruby.brian@gmail.com>:

> On 10/05/05, rgilaard@few.vu.nl <rgilaard@few.vu.nl> wrote:
> > Dear all,
> >
> > I am new to Ruby and I'm looking for a way to use Ruby (1.8) to read a part
> of
> > a textfile into a matrix.
> >
> > The textfile lokks like:
> >
> > === Confusion Matrix ===
> >
> > a b c <-- classified as
> > 7494 4044 100 | a = WEL
> > 2039 18691 11 | b = NIET
> > 707 293 441 | c = NOOIT
> >
> > So what i want is that this matrix is read into a matrix variable in a
> ruby
> > program which I can use then to manipulate in every way I want.
> >
> > Can someone help me with this?
> >
> > I figured out that I could maybe use a regexp /\s*a\s*/ to search for the
> line
> > with a b c
> > Then I skip that line and start to read the following line position by
> position
> > into the first row of the 3-by-3 matrix.
> >
> > How could this be done?
> >
> > Thanks in advance,
> > Robert Gilaard
> >
>
> Confused? ;-)
>
> $ cat confusion.rb
> matrix = []
>
> DATA.each do | line |
> if /^((?:\s+(?:\d+))+)/ =~ line
> matrix << $1.split.map{|value| value.to_i}
> end
> end
>
> p matrix
>
> __END__
> a b c <-- classified as
> 7494 4044 100 | a = WEL
> 2039 18691 11 | b = NIET
> 707 293 441 | c = NOOIT
>
> $ ruby confusion.rb
> [[7494, 4044, 100], [2039, 18691, 11], [707, 293, 441]]
>
> regards,
>
> Brian Schröder
>
> --
> http://ruby.brian-sch...
>
> multilingual _non rails_ ruby based vocabulary trainer:
> http://www.vocabu... | http://www.g... |
> http://www.vok...
>
>




ES

5/10/2005 4:35:00 PM

0

rgilaard@few.vu.nl wrote:
> Oof course I am confused a s a ruby newbie!!
>
> However,
> I've made this out of your post:
> matrix = []
>
> DATA = File.new("testfile.txt", "r")
> DATA.each do | line |
> if /^((?:\s+(?:\d+))+)/ =~ line
> matrix << $1.split.map{|value| value.to_i}
> end
> end
>
> p matrix
> puts matrix[2,2]
> DATA.close
>
> But this gives me as result
> 707
> 293
> 441
>
> while I would expect 441.
>
> What is going on?

Here you would want 'puts matrix[2][2]'.

Your form actually returns a slice,
i.e. "starting from element 2, give
me 2 elements" (and there is only one).

> Brgds
> Robert
>
> Quoting Brian Schröder <ruby.brian@gmail.com>:
>
>
>>On 10/05/05, rgilaard@few.vu.nl <rgilaard@few.vu.nl> wrote:
>>
>>>Dear all,
>>>
>>>I am new to Ruby and I'm looking for a way to use Ruby (1.8) to read a part
>>
>>of
>>
>>>a textfile into a matrix.
>>>
>>>The textfile lokks like:
>>>
>>>=== Confusion Matrix ===
>>>
>>> a b c <-- classified as
>>> 7494 4044 100 | a = WEL
>>> 2039 18691 11 | b = NIET
>>> 707 293 441 | c = NOOIT
>>>
>>>So what i want is that this matrix is read into a matrix variable in a
>>
>>ruby
>>
>>>program which I can use then to manipulate in every way I want.
>>>
>>>Can someone help me with this?
>>>
>>>I figured out that I could maybe use a regexp /\s*a\s*/ to search for the
>>
>>line
>>
>>>with a b c
>>>Then I skip that line and start to read the following line position by
>>
>>position
>>
>>>into the first row of the 3-by-3 matrix.
>>>
>>>How could this be done?
>>>
>>>Thanks in advance,
>>>Robert Gilaard
>>>
>>
>>Confused? ;-)
>>
>>$ cat confusion.rb
>>matrix = []
>>
>>DATA.each do | line |
>> if /^((?:\s+(?:\d+))+)/ =~ line
>> matrix << $1.split.map{|value| value.to_i}
>> end
>>end
>>
>>p matrix
>>
>>__END__
>> a b c <-- classified as
>> 7494 4044 100 | a = WEL
>> 2039 18691 11 | b = NIET
>> 707 293 441 | c = NOOIT
>>
>>$ ruby confusion.rb
>>[[7494, 4044, 100], [2039, 18691, 11], [707, 293, 441]]
>>
>>regards,
>>
>>Brian Schröder
>>
>>--
>>http://ruby.brian-sch...
>>
>>multilingual _non rails_ ruby based vocabulary trainer:
>>http://www.vocabu... | http://www.g... |
>>http://www.vok...
>>

E

--
template<typename duck>
void quack(duck& d) { d.quack(); }