[R] matrix/df help populate NA

[Jeff Newmiller]

?merge

Particularly look at the all argument.
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Sent from my phone. Please excuse my brevity.

On June 13, 2015 8:17:35 PM PDT, Adrian Johnson <oriolebaltimore at gmail.com> wrote:
>Dear group:
>
>I have two data frames. The column names of the two data frame has
>some common variables but not identical.
>
>my aim is to make 2  DFs more uniform by taking union of both colnames
>
>
>For example: I have x1 and x2 matrices:
>
>> x1
>  Subject    A    B   C    D
>1      x1  1.5 -1.3 0.4 -0.2
>2      x2 -1.2 -0.3 0.3 -0.1
>> x2
>  Subject   A    D   F    H
>1      x1 4.3 -2.4 1.3 -2.3
>2      x2 2.4  0.1 0.5 -1.4
>
> cases = c('A','B','C','D','F','H')
>
>for X2 I want to create newX2 DF.
>
>> x3
>  Subject   A  B  C    D   F    H
>1      x1 4.3 NA NA -2.4 1.3 -2.3
>2      x2 2.4 NA NA  0.1 0.5 -1.4
>
>
>Since B and C are no existing in x2, I put NAs.
>
>how can I create x3 matrix?
>
>
>
>dput code:
>
>x1 = structure(list(Subject = c("x1", "x2"), A = c(1.5, -1.2), B =
>c(-1.3,
>-0.3), C = c(0.4, 0.3), D = c(-0.2, -0.1)), .Names = c("Subject",
>"A", "B", "C", "D"), class = "data.frame", row.names = c(NA,
>-2L))
>
>x2 = structure(list(Subject = c("x1", "x2"), A = c(4.3, 2.4), D =
>c(-2.4,
>0.1), F = c(1.3, 0.5), H = c(-2.3, -1.4)), .Names = c("Subject",
>"A", "D", "F", "H"), class = "data.frame", row.names = c(NA,
>-2L))
>
>
>Could you please help how to create x3 with NAs incorporated.
>adrian.
>
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