R help - Mar 2013 - How to loop several binary files from two directories?

I have two binary files(rasters) with the same dimensions. The first file is
called `over`  and the second is `corr`. I want to replace values in `over`
by `NA` whenever `corr` is greater than 0.5.


to read the two files we can use:

        conne <- file("C:corr.bin","rb")
        over <- readBin(conne, numeric(), size=4,  n=1440*720, signed=TRUE)
        frf <- file("C:cor206.bin","rb")
        corr <- readBin(frf, numeric(), size=4,  n=1440*720, signed=TRUE)
        
to replace values in `over` by `NA` whenever `corr` is greater than 0.5:
                               
                         over[corr > 0.4] = NA
to write the results:

      to.write = file(paste("C:flag.bin", sep=""),
"wb")
      writeBin(as.double(over), to.write, size = 4)
      close(to.write)
              
            
Now I want to do the same but with 24 files(12 files in each directory) i.e.
to loop thru several files :
so file1 from the first directory with file1 from the second directory and
so on....

To read the files from both directories

    firstdirctory   <- list.files("C:final-2010",
"*.bin", full.names TRUE)
    seconddirctory   <- list.files("C:jop-2012", "*.bin",
full.names = TRUE)



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HI,

Check these links:
http://r.789695.n4.nabble.com/Re-new-question-td4659908.html
http://r.789695.n4.nabble.com/Re-reading-data-td4658705.html#a4659751

It shows reading files (not binary files) from multiple subdirectories and doing
some calculations.
You may need to change it according to your needs ('read.table' to
'readBin' etc.)
?A.K.




----- Original Message -----
From: Jonsson <amen.alyaari at Bordeaux.inra.fr>
To: r-help at r-project.org
Cc: 
Sent: Monday, March 4, 2013 6:08 AM
Subject: [R] How to loop several binary files from two directories?

I have two binary files(rasters) with the same dimensions. The first file is
called `over`? and the second is `corr`. I want to replace values in `over`
by `NA` whenever `corr` is greater than 0.5.


to read the two files we can use:

? ? ? ? conne <- file("C:corr.bin","rb")
? ? ? ? over <- readBin(conne, numeric(), size=4,? n=1440*720, signed=TRUE)
? ? ? ? frf <- file("C:cor206.bin","rb")
? ? ? ? corr <- readBin(frf, numeric(), size=4,? n=1440*720, signed=TRUE)
? ? ? ? 
to replace values in `over` by `NA` whenever `corr` is greater than 0.5:
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 
? ? ? ? ? ? ? ? ? ? ? ?  over[corr > 0.4] = NA
to write the results:

? ? ? to.write = file(paste("C:flag.bin", sep=""),
"wb")
? ? ? writeBin(as.double(over), to.write, size = 4)
? ? ? close(to.write)
? ? ? ? ? ? ? 
? ? ? ? ? ? 
Now I want to do the same but with 24 files(12 files in each directory) i.e.
to loop thru several files :
so file1 from the first directory with file1 from the second directory and
so on....

To read the files from both directories

? ? firstdirctory?  <- list.files("C:final-2010",
"*.bin", full.names TRUE)
? ? seconddirctory?  <- list.files("C:jop-2012", "*.bin",
full.names = TRUE)



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