On 2010-02-21 15:06, jmgray wrote:
I was trying to save a data frame to an excel file using the following
command:
write.table(myData, file="myData.csv",sep=",", row.names=F)
The command works for some data frames, but for other data frames, I get
the
following error:
Error in if (inherits(X[[j]], "data.frame")&& ncol(xj)> 1L) X[[j]]<-
as.matrix(X[[j]]) :
missing value where TRUE/FALSE needed
I got an identical error message when instead of combining two data frames
(a,b) with a method such as:
a<- cbind.data.frame(a,b)
I embedded a data.frame in another, e.g.,
a$b<- b
In the latter example, I have a column (a$b) that consists of a data frame
onto itself, which write.table apparently can't handle.
Jesse Gray
Neurobiology
Harvard Medical School
Here's my precise error message:
Error in if (inherits(X[[j]], "data.frame")&& ncol(xj)> 1L) X[[j]]<-
as.matrix(X[[j]]) :
missing value where TRUE/FALSE needed
This is one reason why I'm not fond of the '$' way of accessing
dataframe components. I like neither of your methods for
combining two dataframes. Try instead:
a <- data.frame(a, b) ## no problem (assuming same number of rows)
or
a[, "b"] <- b ## R tells you that you're trying to do
something you shouldn't.
-Peter Ehlers
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