readCelIntensities: Reads the intensities contained in several Affymetrix CEL...
In affxparser: Affymetrix File Parsing SDK

Description Usage Arguments Details Value Note Author(s) See Also Examples

Reads the intensities of several Affymetrix CEL files (as opposed to readCel() which only reads a single file).

1	readCelIntensities(filenames, indices = NULL, ..., verbose = 0)

`filenames`	the names of the CEL files as a character vector.
`indices`	a vector of which indices should be read. If the argument is `NULL` all features will be returned.
`...`	Additional arguments passed to `readCel`().
`verbose`	an integer: how verbose do we want to be, higher means more verbose.

The function will initially allocate a matrix with the same memory footprint as the final object.

A matrix with a number of rows equal to the length of the indices argument (or the number of features on the entire chip), and a number of columns equal to the number of files. The columns are ordered according to the filenames argument.

Currently this function builds on readCel(), and simply calls this function multiple times. If testing yields sufficient reasons for doing so, it may be re-implemented in C++.

James Bullard and Kasper Daniel Hansen

readCel() for a discussion of a more versatile function, particular with details of the indices argument.

  # Scan current directory for CEL files
  files <- list.files(pattern="[.](c|C)(e|E)(l|L)$")
  if (length(files) >= 2) {
    cel <- readCelIntensities(files[1:2])
    str(cel)
    rm(cel)
  }

  # Clean up
  rm(files)