[R] Error in FUN(X[[1L]], ...) : STRING_ELT() can only be applied to a 'character vector', not a 'integer'

[sedm1000]

Sorry - I figured that this to be a more common defined error than anything
specific to the data/function...  Thanks for looking at this.

The data and function are below. Creating a single line of the data.frame at
a time will work (i.e. fold(s))

For multiple line data.frames, an error is generated. Ideally I would like
to record the output from fold(sq) in a two column data.frame, whether it
requires reading in the data to fold one line at a time or in bulk.

> library(GeneRfold)
> s<- "ATTATGCATCGACTAGCATCACTAG"
> fold(s)
[[1]]
[1] "...((((........))))......"

[[2]]
[1] -2.3


> sq <- data.frame(c("ATGTGTGATATGCATGTACAGCATCGAC",
+ 		"ACTAGCACTAGCATCAGCTGTAGATAGA",
+ 		"ACTAGCATCGACATCATCGACATGATAG",
+ 		"CATCGACTACGACTACGTAGATAGATAG",
+ 		"ATCAGCACTACGACACATAGATAGAATA"))

>fold(sq)
Error in fold(sq) : 
  STRING_ELT() can only be applied to a 'character vector', not a 'list'

> struct <- t(as.data.frame(sapply(sq[,1], fold, t=37)))

Error in FUN(X[[1L]], ...) :
 STRING_ELT() can only be applied to a 'character vector', not a 'integer'


>dput(fold,file="fred123")

function (s, t = 37) 
{
    .Call("foldR", s, t, PACKAGE = "GeneRfold")
}

> dput(sq)
structure(list(c..ATGTGTGATATGCATGTACAGCATCGAC....ACTAGCACTAGCATCAGCTGTAGATAGA...
= structure(c(4L, 
1L, 2L, 5L, 3L), .Label = c("ACTAGCACTAGCATCAGCTGTAGATAGA",
"ACTAGCATCGACATCATCGACATGATAG", 
"ATCAGCACTACGACACATAGATAGAATA", "ATGTGTGATATGCATGTACAGCATCGAC", 
"CATCGACTACGACTACGTAGATAGATAG"), class = "factor")), .Names =
"c..ATGTGTGATATGCATGTACAGCATCGAC....ACTAGCACTAGCATCAGCTGTAGATAGA...",
row.names = c(NA, 
-5L), class = "data.frame")

> dput(s)
"ATTATGCATCGACTAGCATCACTAG"

> sessionInfo()
R version 2.11.0 (2010-04-22)
i386-apple-darwin9.8.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] GeneRfold_1.6.0 GeneR_2.18.0

loaded via a namespace (and not attached):
[1] tools_2.11.0

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