[R] replace NA value with 0

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 17.03.2010 18:01:50:

> 
> Building on the question how to replace NA with 0.
> 
> My data set below has date, station 1, flags for station 1, station 2, 
flags
> for station 2, etc...
> 
> I would like to make the values in the station columns equal to 1 and 
the NA
> in the station columns equal to 0 and then sum each row for the number 
of 1
> present in the row.
> 
> head(data.matrix, n=10)
>          date 05AE005 flg_05AE005 05AF010 flg_05AF010 05BM014 
flg_05BM014
> 1  1900-01-01      NA        <NA>      NA        <NA>      NA <NA>
> 2  1900-01-02      NA        <NA>      NA        <NA>      .23 <NA>
> 3  1900-01-03      NA        <NA>      NA        <NA>      .45 <NA>
> 4  1900-01-04      NA        <NA>      NA        <NA>      NA <NA>
> 5  1900-01-05      NA        <NA>      NA        <NA>      NA <NA>
> 6  1900-01-06      NA        <NA>      NA        <NA>      NA <NA>
> 7  1900-01-07      0.75      <NA>      .09        <NA>      NA <NA>
> 8  1900-01-08      0.87      <NA>      .23        <NA>      NA <NA>
> 9  1900-01-09      0.26      <NA>      .78        <NA>      NA <NA>
> 10 1900-01-10      0.23      <NA>      NA        <NA>      NA <NA>
> 
> # figure out which columns the data are in
> colpos <- seq(2, by = 2, length.out = n)

What relation is colpos to data.matrix?

> 
> # make value 1 and NA 0
> colpos[!is.na(colpos)] <- 1.0
> colpos[is.na(colpos)] <- 0.0
> 
> # sum number of values on a given day
> rowsum(colpos, )

Do you want by chance to get how many nonnumeric values are in each row of 
your data frame in station columns?

If yes, try

colpos <- seq(2, 7, by = 2)
rowSums(!is.na(data.matrix)[,colpos])

Regards
Petr


> 
> 
> The above script is what i have tried - and does not work. The values 
are
> not being replaced with 1s and the NAs with 0s and the rows are not 
being
> summed.
> 
> any help would be greatly appreciated.
> 
> E
> 
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