Re: [R] column width in .dbf files using write.dbf ... to be continued
Thanks Bastien,
I completely forgot that I asked this question.
I learned a lot since then ... actually, now I know how to do it, but it
was not the case in 2009 :-)
Arnaud
2013/5/22
>
> Hello Arnaud,
>
> You posted this question a long long time ago, however I found your answer
> so I decided to post it anyway in case somebody else have the same problem
> as you and me.
>
> You were actually very close in finding your solution. The function
> DoWritedbf is an internal function from the foreign package. To access it
> outside of the package just do:
>
> foreign:::DoWritedbf
>
> so in your line:
>
> invisible(.Call(foreign:::DoWritedbf, as.character(file), dataframe,
> as.integer(precision), as.integer(scale), as.character(DataTypes)))
>
> It is explain here:
> http://stackoverflow.com/questions/2165342/r-calling-a-function-from-a-namespace
>
> Sorry for the delay in my answer...
>
> Bastien Ferland-Raymond, M.Sc. Stat., M.Sc. Biol.
> Division des orientations et projets spéciaux
> Direction des inventaires forestiers
> Ministère des Ressources naturelles
>
> In reply to :
> #
> Dear UseRs,
> I did not have any answer to my previous message ("Is there a way to
> define "manually" columns width when using write.dbf function from the
> library foreign ?"), so I tried to modify write.dbf function to do what I
> want.
> Here is my modified version :
> write.dbfMODIF <- function (dataframe, file, factor2char = TRUE, max_nchar
> = 254, width = d)
> {
> allowed_classes <- c("logical", "integer", "numeric", "character",
> "factor", "Date")
> if (!is.data.frame(dataframe))
> dataframe <- as.data.frame(dataframe) if
> (any(sapply(dataframe, function(x) !is.null(dim(x)
> stop("cannot handle matrix/array columns") cl <-
> sapply(dataframe, function(x) class(x[1L])) asis <- cl == "AsIs"
> cl[asis & sapply(dataframe, mode) == "character"] <- "character"
> if (length(cl0 <- setdiff(cl, allowed_classes)))
> stop("data frame contains columns of unsupported class(es) ",
> paste(cl0, collapse = ","))
>
> m <- ncol(dataframe)
> DataTypes <- c(logical = "L", integer = "N", numeric = "F",
> character = "C", factor = if (factor2char) "C" else "N",
> Date = "D")[cl]
> for (i in seq_len(m)) {
> x <- dataframe[[i]]
> if (is.factor(x))
> dataframe[[i]] <- if (factor2char)
> as.character(x)
> else as.integer(x)
> else if (inherits(x, "Date"))
> dataframe[[i]] <- format(x, "%Y%m%d")
> }
> precision <- integer(m)
> scale <- integer(m)
> dfnames <- names(dataframe)
> for (i in seq_len(m)) {
> nlen <- nchar(dfnames[i], "b")
> x <- dataframe[, i]
> if (is.logical(x)) {
> precision[i] <- 1L
> scale[i] <- 0L
>
>
> }
>
> else if (is.integer(x)) {
> rx <- range(x, na.rm = TRUE)
> rx[!is.finite(rx)] <- 0
> if (any(rx == 0))
> rx <- rx + 1
> mrx <- as.integer(max(ceiling(log10(abs(rx +
> 3L)
> precision[i] <- min(max(nlen, mrx), 19L)
> scale[i] <- 0L
>
>
> }
>
> else if (is.double(x)) {
> precision[i] <- 19L
> rx <- range(x, na.rm = TRUE)
> rx[!is.finite(rx)] <- 0
> mrx <- max(ceiling(log10(abs(rx
> scale[i] <- min(precision[i] - ifelse(mrx > 0L, mrx +
> 3L, 3L), 15L)
>
>
> }
>
> else if (is.character(x)) {
> if (width == "d") {
>mf <- max(nchar(x[!is.na(x)], "b"))
> p <- max(nlen, mf)
> if (p > max_nchar)
> warning(gettext("character column %d will be truncated
> to %d bytes",
> i, max_nchar), domain = NA)
> precision[i] <- min(p, max_nchar)
> scale[i] <- 0L
>
>
> } else {
>
>
> if (width > max_nchar)
> warning(gettext("character column %d will be truncated
> to %d bytes",
> i, max_nchar), domain = NA)
> precision[i] <- min(width, max_nchar)
>
>
> }
>
> }
>
> else stop("unknown column type in data frame")
> }
> if (any(is.na(precision)))
> stop("NA in precision")
> if (any(is.na(scale)))
> stop("NA in scale")
> invisible(.Call(DoWritedbf, as.character(file), dataframe,
> as.integer(precision), as.integer(scale),
> as.character(DataTypes))) }
> However, when I wanted to use this function ... it does not find the
> DoWritedbf function that is called in the last lines (a function written in
> C).
> Is there a way to temporally replace the original write.dbf function by
> this one in the foreign package ?
> Thanks,
> Arnaud
> R version 2.10.0 (2009-10-26)
> i386-pc-mingw32
> ##
>
>
>
Re: [R] column width in .dbf files using write.dbf ... to be continued
Hello Arnaud,
You posted this question a long long time ago, however I found your answer so I
decided to post it anyway in case somebody else have the same problem as you
and me.
You were actually very close in finding your solution. The function DoWritedbf
is an internal function from the foreign package. To access it outside of the
package just do:
foreign:::DoWritedbf
so in your line:
invisible(.Call(foreign:::DoWritedbf, as.character(file), dataframe,
as.integer(precision), as.integer(scale), as.character(DataTypes)))
It is explain here:
http://stackoverflow.com/questions/2165342/r-calling-a-function-from-a-namespace
Sorry for the delay in my answer...
Bastien Ferland-Raymond, M.Sc. Stat., M.Sc. Biol.
Division des orientations et projets spéciaux
Direction des inventaires forestiers
Ministère des Ressources naturelles
In reply to :
#
Dear UseRs,
I did not have any answer to my previous message ("Is there a way to define
"manually" columns width when using write.dbf function from the library foreign
?"), so I tried to modify write.dbf function to do what I want.
Here is my modified version :
write.dbfMODIF <- function (dataframe, file, factor2char = TRUE, max_nchar =
254, width = d)
{
allowed_classes <- c("logical", "integer", "numeric", "character",
"factor", "Date")
if (!is.data.frame(dataframe))
dataframe <- as.data.frame(dataframe) if (any(sapply(dataframe,
function(x) !is.null(dim(x)
stop("cannot handle matrix/array columns") cl <- sapply(dataframe,
function(x) class(x[1L])) asis <- cl == "AsIs"
cl[asis & sapply(dataframe, mode) == "character"] <- "character" if
(length(cl0 <- setdiff(cl, allowed_classes)))
stop("data frame contains columns of unsupported class(es) ",
paste(cl0, collapse = ","))
m <- ncol(dataframe)
DataTypes <- c(logical = "L", integer = "N", numeric = "F",
character = "C", factor = if (factor2char) "C" else "N",
Date = "D")[cl]
for (i in seq_len(m)) {
x <- dataframe[[i]]
if (is.factor(x))
dataframe[[i]] <- if (factor2char)
as.character(x)
else as.integer(x)
else if (inherits(x, "Date"))
dataframe[[i]] <- format(x, "%Y%m%d")
}
precision <- integer(m)
scale <- integer(m)
dfnames <- names(dataframe)
for (i in seq_len(m)) {
nlen <- nchar(dfnames[i], "b")
x <- dataframe[, i]
if (is.logical(x)) {
precision[i] <- 1L
scale[i] <- 0L
}
else if (is.integer(x)) {
rx <- range(x, na.rm = TRUE)
rx[!is.finite(rx)] <- 0
if (any(rx == 0))
rx <- rx + 1
mrx <- as.integer(max(ceiling(log10(abs(rx +
3L)
precision[i] <- min(max(nlen, mrx), 19L)
scale[i] <- 0L
}
else if (is.double(x)) {
precision[i] <- 19L
rx <- range(x, na.rm = TRUE)
rx[!is.finite(rx)] <- 0
mrx <- max(ceiling(log10(abs(rx
scale[i] <- min(precision[i] - ifelse(mrx > 0L, mrx +
3L, 3L), 15L)
}
else if (is.character(x)) {
if (width == "d") {
mf <- max(nchar(x[!is.na(x)], "b"))
p <- max(nlen, mf)
if (p > max_nchar)
warning(gettext("character column %d will be truncated
to %d bytes",
i, max_nchar), domain = NA)
precision[i] <- min(p, max_nchar)
scale[i] <- 0L
} else {
if (width > max_nchar)
warning(gettext("character column %d will be truncated
to %d bytes",
i, max_nchar), domain = NA)
precision[i] <- min(width, max_nchar)
}
}
else stop("unknown column type in data frame")
}
if (any(is.na(precision)))
stop("NA in precision")
if (any(is.na(scale)))
stop("NA in scale")
invisible(.Call(DoWritedbf, as.character(file), dataframe,
as.integer(precision), as.integer(scale), as.character(DataTypes))) }
However, when I wanted to use this function ... it does not find the DoWritedbf
function that is called in the last lines (a function written in C).
Is there a way to temporally replace the original write.dbf function by this
one in the foreign package ?
Thanks,
Arnaud
R version 2.10.0 (2009-10-26)
i386-pc-mingw32
##
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] column width in .dbf files using write.dbf ... to be continued
Old topic... An answer may be useful for someone else, though... Just do : > environment(write.dbfMODIF)<-environment(foreign::write.dbf ) and it should be good to go. Cheers, -- View this message in context: http://r.789695.n4.nabble.com/column-width-in-dbf-files-using-write-dbf-to-be-continued-tp1013017p4645841.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] column width in .dbf files using write.dbf ... to be continued
Dear UseRs,
I did not have any answer to my previous message ("Is there a way to define
"manually" columns width when using write.dbf function from the library
foreign ?"), so I tried to modify write.dbf function to do what I want.
Here is my modified version :
write.dbfMODIF <- function (dataframe, file, factor2char = TRUE, max_nchar =
254, width = d)
{
allowed_classes <- c("logical", "integer", "numeric", "character",
"factor", "Date")
if (!is.data.frame(dataframe))
dataframe <- as.data.frame(dataframe)
if (any(sapply(dataframe, function(x) !is.null(dim(x)
stop("cannot handle matrix/array columns")
cl <- sapply(dataframe, function(x) class(x[1L]))
asis <- cl == "AsIs"
cl[asis & sapply(dataframe, mode) == "character"] <- "character"
if (length(cl0 <- setdiff(cl, allowed_classes)))
stop("data frame contains columns of unsupported class(es) ",
paste(cl0, collapse = ","))
m <- ncol(dataframe)
DataTypes <- c(logical = "L", integer = "N", numeric = "F",
character = "C", factor = if (factor2char) "C" else "N",
Date = "D")[cl]
for (i in seq_len(m)) {
x <- dataframe[[i]]
if (is.factor(x))
dataframe[[i]] <- if (factor2char)
as.character(x)
else as.integer(x)
else if (inherits(x, "Date"))
dataframe[[i]] <- format(x, "%Y%m%d")
}
precision <- integer(m)
scale <- integer(m)
dfnames <- names(dataframe)
for (i in seq_len(m)) {
nlen <- nchar(dfnames[i], "b")
x <- dataframe[, i]
if (is.logical(x)) {
precision[i] <- 1L
scale[i] <- 0L
}
else if (is.integer(x)) {
rx <- range(x, na.rm = TRUE)
rx[!is.finite(rx)] <- 0
if (any(rx == 0))
rx <- rx + 1
mrx <- as.integer(max(ceiling(log10(abs(rx +
3L)
precision[i] <- min(max(nlen, mrx), 19L)
scale[i] <- 0L
}
else if (is.double(x)) {
precision[i] <- 19L
rx <- range(x, na.rm = TRUE)
rx[!is.finite(rx)] <- 0
mrx <- max(ceiling(log10(abs(rx
scale[i] <- min(precision[i] - ifelse(mrx > 0L, mrx +
3L, 3L), 15L)
}
else if (is.character(x)) {
if (width == "d") {
mf <- max(nchar(x[!is.na(x)], "b"))
p <- max(nlen, mf)
if (p > max_nchar)
warning(gettext("character column %d will be truncated
to %d bytes",
i, max_nchar), domain = NA)
precision[i] <- min(p, max_nchar)
scale[i] <- 0L
} else {
if (width > max_nchar)
warning(gettext("character column %d will be truncated
to %d bytes",
i, max_nchar), domain = NA)
precision[i] <- min(width, max_nchar)
}
}
else stop("unknown column type in data frame")
}
if (any(is.na(precision)))
stop("NA in precision")
if (any(is.na(scale)))
stop("NA in scale")
invisible(.Call(DoWritedbf, as.character(file), dataframe,
as.integer(precision), as.integer(scale), as.character(DataTypes)))
}
However, when I wanted to use this function ... it does not find the
DoWritedbf function that is called in the last lines (a function written in
C).
Is there a way to temporally replace the original write.dbf function by this
one in the foreign package ?
Thanks,
Arnaud
R version 2.10.0 (2009-10-26)
i386-pc-mingw32
[[alternative HTML version deleted]]
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
