From: Axel Etzold <AEtzold@...>
Date: 2007-06-30T03:58:30+09:00
Subject: Re: newbie questions on processing numerical data from text files

> > interesting_text.delete_if{|line|  /(r|R)uby/.match==nil}
> >
> > removes all lines that don't contain the string Ruby or ruby,
> 
> for some reason this doesn't work for me. I get an error message:
> ArgumentError: wrong number of arguments (0 for 1)
> 
> 
> if i replace this argument with something based on line numbers  
> rather than regexp, it's fine. Is the Regexp wrong?

You're right. The line should read:

interesting_text.delete_if{|line|  /(r|R)uby/.match(line)==nil}

> 
> 
> >
> >> and change a value
> > old_value=1.2
> > new_value=2.4
> >
> > interesting_text.sub!(old_value.to_s,new_value.to_s)
> >
> 
> I can't get that to work either :
> NoMethodError: private method `sub!' called for #<Array:0x7d180>
> 
.. and again .. sub, gsub, sub!,gsub! are for Strings ... so
either:

interesting_text=IO.readlines(file_name).to_s  
interesting_text.sub!(old_value.to_s,new_value.to_s)

or , if, each line is to be processed separately,

interesting_text=IO.readlines(file_name)

new_text=interesting_text.each{|line|  
line.sub(old_value.to_s,new_value.to_s)}

Sorry for the confusion.

Best regards,

Axel 
> 
> 
> >
> >
> > Best regards,
> >
> > Axel
> 
> 
> The rest works fine, thanks again!
> 
> baptiste
> 
> 

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