write.ftsv <- function(data, con, name="unnamed_dataset", rowdim="rows", coldim="cols") {
    # If con is a file name, open it 
    opened.here = FALSE
    if (is.character(con)){
        con = file(con, "w")
        opened.here = TRUE 
    }
    
    # Substitute all whitespace with underscores in identifiers 
    rows <- paste(gsub("\\s", "_", rownames(data)), collapse=" ")
    cols <- paste(gsub("\\s", "_", colnames(data)), collapse=" ")

    # Write header 
    writeLines(c("# type: dataset", 
                 paste("# dimension:", rowdim, rows, collapse=' '), 
                 paste("# dimension:", coldim, cols, collapse=' '), 
                 paste("# name:", name, collapse=' '),
                 ""),
               con=con)

    # Write matrix 
    write.table(data, file=con, col.names=FALSE, row.names=FALSE, sep="\t")

    # If con was a string, close file now 
    if (opened.here)
        close(con)
}