[R] Substitutions in strings.

[ripley@stats.ox.ac.uk]

On Mon, 1 Jul 2002, Fredrik Karlsson wrote:

> Hi all,
>
> Sorry to bother you with the potentially not too bright question, but
> since I cannot get it to work, I'll have to ask someone..
>
> I've got this vector:

That's not a vector (or it would be printed with quotes).  My guess is
that it is a factor,  Try as.character(token).

>
> > token
> [1] sal   skal  skal  bak   b_r   d_    gal   kal   l_r   n_r   pak
> p_r
> [13] sal   sl_r  sn_r  spak  sp_r  st_r  s_    bak   d_    gal   l_r
> pak
> [25] p_r   sak   sl_r  sp_r  t_    kal   n_r   s_    st_r  sak   kal
> spak
> [37] s_    spik  t_    n_r   spik  spak  gal   pak   p_r   sak   sl_r
> spak
> [49] s_    s_r   t_    b_r   s_r   bak   d_    l_r   skal  sp_r
> sl_r  sal
> [61] st_r  n_r   bak   b_r   d_    l_r   n_r   pak   p_r   sal
> skal  sl_r
> [73] sn_r  spak  sp_r  st_r  s_    s_r   t_    bak   d_    l_r
> pak   p_r
> [85] sl_r  sn_r  spak  spik  s_r   t_    gal   kal   gal   n_r
> kal   spik
> [97] n_r   n_r   bak   b_r   d_    gal   l_r   sak   sal   skal
> sl_r  sn_r
> [109] spik  sp_r  st_r  s_    s_r   gal   kal   n_r   sak   kal
> pak   p_r
> .
> .
> .
>
> What I whant to do is to substitute all the '_'s in the vector whith
> some other character.
>
> Trying it out, this works.
>
> >gsub("_","A",c("_","_a_"))
> [1] "A"   "AaA"
>
> However, this does not..
>
> >gsub("_","A",token)
> Error in gsub(pattern, replacement, x, ignore.case, extended) :
> 	invalid argument
>
> Can't see why. Please help me out..
>
> /Fredrik
>
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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