[R] how to ignore NA with "NA" or "NULL"

[Rui Barradas]

Hello,

Why don't you test an all(is.na(x)) condition? If TRUE, return(NA), not 
NULL.

Rui Barradas

Em 06-06-2012 16:42, jeff6868 escreveu:
> Thanks again for your help jeff.
> Sorry if I'm not very clear. It's programmingly speaking hard to explain,
> and even to explain in english as I'm French.
> But i'll try again.
>
> Well your proposition removes the error, but it's not the result I'm
> expecting. You've removed NULL data.frames, but I need to keep them, well
> not to keep them but to transform them to something non-NULL actually.
>
> I'll try to show you in a very small and fake exemple what I want results to
> be:
> Imagine these are my 3 input data frames (10 rows each):
> ST1 <- data.frame(x1=c(1:10))
> ST2 <- data.frame(x2=c(1:5,NA,NA,8:10))
> ST3 <- data.frame(x3=c(NA,NA,NA,NA,NA,NA,NA,NA,NA,NA))
>
> The aim of my code is to fill all the NA of my data.frames with data,
> according to the correlation coefficient  of my data.frames(for example, if
> there're NAs in ST1, ST1 must be filled with data from the best correlated
> file with ST1 (between ST2 and ST3 in this example)).
>
> As ST3 has no data, I cannot have any correlation coefficient. So NAs from
> ST3 cannot be filled, and ST3 cannot also be used to fill another file. So
> ST3 has no use if you want. Nevertheless I want to keep ST3 unchanged during
> all my code.
> For the moment my code would give for "refill" this (filled NA in my
> data.frames):
>
> ST1 <- data.frame(x1=c(1:10))
> ST2 <- data.frame(x2=c(1:5,6,7,8:10))
> ST3 <- NULL
>
> But actually, I want for results in "refill" this:
>
> ST1 <- data.frame(x1=c(1:10))
> ST2 <- data.frame(x2=c(1:5,6,7,8:10))
> ST3 <- data.frame(x3=c(NA,NA,NA,NA,NA,NA,NA,NA,NA,NA))
>
> So for data.frames with only NAs, I don't want them to be NULL in "refill",
> but I want them to be identical as in input. I need this to have the same
> dimensions of data.frames between inputs and outputs.
> If I set them as NULL (like it is for the moment but I don't understand why
> and I want to change this), there will be 0 rows in this data.frame instead
> of 10 rows like the other data.frames.
>
> So I think there's something wrong in my code in function "process.all" or
> "na.fill" or maybe "lst".
> We don't seem to be far from the solution but I still don't find it for the
> moment.
> For information, in function "process.all" and "na.fill": x is the
> data.frame I want to fill, and y is the file which will be used to fill x
> (so the best correlated file with x).
>
> I really hope I've been enoughly clear and understandable this time.
> Thank you!
>
>
>
> --
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