write.matrix.csr data conversion

Most likely when 'y' is converted to a dataframe (not sure what the
function 'write.matrix.csr' does since you did not say where you got
it), '0' and '1' are converted to factors which probably show up as 1
and 2 in the file.  Here is a quick example:

x <- sample(c(0,1), 20,TRUE)
y <- table(x)
y

x
 0  1
12  8

str(y)

'table' int [1:2(1d)] 12 8
 - attr(*, "dimnames")=List of 1
  ..$ x: chr [1:2] "0" "1"

y.df <- as.data.frame(y)
str(y.df)

'data.frame':   2 obs. of  2 variables:
 $ x   : Factor w/ 2 levels "0","1": 1 2  #<<- norice the 1 & 2 as the
values of the factors '0' & '1'
 $ Freq: int  12 8

write.matrix.csr(mx, y = y, file = file)
table(y)

      0       1
5194394   23487
$ cut -d' ' -f1 f | sort | uniq -c
  23487 2
5194394 1

i.e., 0 is written as 1 and 1 is written as 2.
why?
is there a way to disable this?

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