I need read a table in a string with special format. I used read.csv and
textConnection function.
But i am confuse about textConnection by follow code.
case A: It is OK£¡
str0 <- '{"abc",{"def","X,1&Y,2&Z,3"}}'
str1 <- strsplit(str0,'"')[[1]][6]
str2 <- gsub("&","\n", str1)
con <- textConnection( str2 )
read.csv(con,header=F)
close(con)
case B: It is NOK!
con <- textConnection(
gsub("&","\n",(strsplit('{"abc",{"def","X,1&Y,2&Z,3"}}','"')[[1]][6])) ) #
Error in here
read.csv(con,header=F)
close(con)
case C: It is OK!
str0 <- '{"abc",{"def","X,1&Y,2&Z,3"}}'
con <- textConnection( gsub("&","\n", (strsplit(str0,'"')[[1]][6])) )
read.csv(con,header=F)
close(con)
case D: It is OK!
str2 <- gsub("&","\n", strsplit('{"abc",{"def","X,1&Y,2&Z,3"}}','"')[[1]][6])
con <- textConnection( str2 )
read.csv(con,header=F)
close(con)
Except case B, textConnection report "invalid 'description' argument", in other
case, textConnection is OK.
I don't known, what is different£¿ I report it as [Bug 14527], But the Answer
is :
> your usage is incorrect.
> object: character. A description of the connection. For an input this
> is an R character vector object ...
> and you used an expression. Some expressions work, but only simple ones
> (and none are guaranteed to).
I read the help carefully, but i don't known which usage is incorrect.
Would you help me?
WangSong
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