[R] Insert rows - how can I accomplish this in R

[Gabor Grothendieck]

I did run it so I am not sure how the error crept in.  Anyways,
I have fixed it and a corrected version is below.

---

Here are two solutions.  In both we break up DF into rows
which start with 1.

In #1 we create a new data frame with the required sequence
for A and zeros for B and then we fill it in.

In #2 we convert each set of rows to a zoo object z
where column A is the times and B is the data.  We convert
that zoo object to a ts object (which has the effect of
filling in the missing times) and then create a zoo object
with no data from that merging it with z using a fill of 0.

Finally in both solutions we reconstruct the rows from that by
rbind'ing everything together.


# 1
f <- function(x) {
   DF <- data.frame(A = 1:max(x$A), B = 0)
   DF[x$A,"B"] <- x$B
   DF
}
do.call(rbind, by(DF, cumsum(DF$A == 1), f))

# 2
library(zoo)
f <- function(x) {
   z <- zoo(x$B, x$A)
   ser <- merge(zoo(,time(as.ts(z))), z, fill = 0)
   data.frame(A = time(ser), B = coredata(ser))
}
do.call(rbind, by(DF, cumsum(DF$A == 1), f))


On 8/18/06, Sachin J <sachinj.2006 at yahoo.com> wrote:
>
> Gabor,
>
> Thanks a lot for the help. The 1st method works fine. In 2nd method I am
> getting following error.
>
> > do.call(rbind, by(DF, cumsum(DF$A == 1), f))
> Error in zoo(, time(as.ts(z)), z, fill = 0) :
>         unused argument(s) (fill ...)
> Unable to figure out the cause.
>
> Thanks,
> Sachin
>
>
> Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
>
> Here are two solutions. In both we break up DF into rows
> which start with 1.
>
> In solution #1 we create a new data frame with the required sequence
> for A and zeros for B and then we fill it in.
>
> In solution #2 we convert each set of rows to a zoo object z
> where column A is the times and B is the data. We convert
> that zoo object to a ts object (which has the effect of
> filling in the missing times) and then create a zoo object
> with no data from its times merging that zoo object with z
> using a fill of 0.
>
> Finally in both solutions we reconstruct the rows from that by
> rbind'ing everything together.
>
>
> # 1
> f <- function(x) {
> DF <- data.frame(A = 1:max(x$A), B = 0)
> DF[x$A,"B"] <- x$B
> DF
> }
> do.call(rbind, by(DF, cumsum(DF$A == 1), f))
>
> # 2
> library(zoo)
> f <- function(x) {
> z <- zoo(x$B, x$A)
> ser <- merge(zoo(,time(as.ts(z)), z, fill = 0)
> data.frame(A = time(ser), B = coredata(ser))
> }
> do.call(rbind, by(DF, cumsum(DF$A == 1), f)
>
>
>
>
> On 8/18/06, Sachin J wrote:
> > Hi,
> >
> > I have following dataframe. Column A indicates months.
> >
> > DF <- structure(list(A = c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1,
> > 2, 3, 4, 5, 7, 8, 11, 12, 1, 2, 3, 4, 5, 8), B = c(0, 0, 0, 8,
> > 0, 19, 5, 19, 0, 0, 0, 11, 0, 8, 5, 11, 19, 8, 11, 10, 0, 8,
> > 36, 10, 16, 10, 22)), .Names = c("A", "B"), class = "data.frame",
> row.names = c("1",
> > "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13",
> > "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24",
> > "25", "26", "27"))
> >
> > There is some discontinuity in the data. For example month 6, 9,10 data
> (2nd year) and month 6 data (3rd year) are absent. I want to insert the rows
> in place of these missing months and set the corresponding B column to zero.
> i.e., the result should look like:
> >
> > DFNEW <- structure(list(A = c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1,
> > 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2, 3, 4, 5, 6, 7, 8),
> > B = c(0, 0, 0, 8, 0, 19, 5, 19, 0, 0, 0, 11, 0, 8, 5, 11,
> > 19, 0, 8, 11, 0, 0, 10, 0, 8, 36, 10, 16, 10, 0, 0, 22)), .Names = c("A",
> > "B"), class = "data.frame", row.names = c("1", "2", "3", "4",
> > "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15",
> > "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26",
> > "27", "28", "29", "30", "31", "32"))
> >
> > Thanks in advance.
> >
> > Sachin
> >
> >
> > ---------------------------------
> >
> >
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