R help - May 2007 - space in R

hello,
can you help me I need to seperate words and symbol in a mathematics formula as
follow

C744=(C627*C177)/100

How could I do please?


     
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elyakhlifi mustapha wrote:
> 
> hello,
> can you help me I need to seperate words and symbol in a mathematics
> formula as follow
> 
> C744=(C627*C177)/100
> 
> How could I do please?
> 
If you need to simply split a character vector, use strsplit.

This and previous your posts suggest you need to create a parser.
parse can do that.

However, R doesn't seem to me an appropriate tool for the lexical analysis.
bison and yacc could be the right choise.
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1. Use this gsub:

txt <- " C744=(C627*C177)/100"
gsub("\\b|([^[:alnum:]])", " \\1 ", txt)

and then strsplit or scan as in prior response.

2. If your text consists of valid R expressions then we can use the
R parse function can traverse the tree as shown:

txt <- " C744=(C627*C177)/100"
e <- parse(text = txt)
my.print <- function(e) {
	L <- as.list(e)
	if (length(L) == 0) return(invisible())
	if (length(L) == 1) print(L[[1]])
	else sapply(L, my.print)
	return(invisible())
}
my.print(e[[1]])

There is a parser for a portion of R in the Ryacas package you could
look at.


On 5/15/07, elyakhlifi mustapha <elyakhlifi_mustapha at yahoo.fr>
wrote:
> hello,
> can you help me I need to seperate words and symbol in a mathematics
formula as follow
>
> C744=(C627*C177)/100
>
> How could I do please?
>
>
>     
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>
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>
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