dmtype2split

Description

CIAO extends the concept of type 1 and type 2 PHA files to general tables. A type 1 file of size N is a simple table consisting of scalar columns each with N rows. A type 2 file of size N x M is a table with M rows in which each column is either scalar or an array of size N. Each row of the type 2 file corresponds to a whole type 1 file, and `dmtype2split' performs this mapping.

The mapping consists of turning each array column entry from `sideways' to `vertical', so that an array of 4096 values becomes a column with 4096 rows. Scalar columns map to keywords in the output file.

Each of the specified rows in the type 2 file is copied to a type 1 file. Each output file has the basic header keywords and subspace copied from the input. If the input file is a pha file, keywords required by the OGIP format are also written; otherwise, generic keywords are written. For each scalar column in the input, the coordinate keyword information is written, and the datatype, value, and unit are written as a keyword. For each input column that is an array, a column is created from the datatype, value, and unit; the row of input data is read and written to the output column.

Specifying Rows

The rows can be specified in any order, but the Data Model sorts them numerically before processing. If supplying several input rows and a stack of output filenames, it is recommended that the rows be given in order so that the mapping to the filename is clear. The rows may be comma- or colon-delimited, e.g., "1:4,6,9:12". A colon-delimited interval is inclusive (e.g., "2:5" means rows 2, 3, 4, 5). If the number of rows specified does not equal the number of output files specified, the program exits with an error message. If no rows are specified, rows 1:n are processed, where n is the number of files in the outfile stack.