15. Generating response matrices

Generation of response matrices can be handled via a front-end program like other accumulations or calling directly the appropriate instrument-dependent program.
Matrices can be produces in XAS format or directly in OGIP (XSPEC-compatible) format.

As prerequisites one shall ensure that

setting of the appropriate environment variables is complete
one knows the instrument configuration and the parameters used for accumulating spectra (THIS IS YET SUBJECT TO EVOLUTION AND WILL BE FINALISED LATER)

A separate description explains what is an RMF or an ARF, and when either is produced.
There are a few ways of controlling the behaviour of the accumulation program.

accumulating a matrix (normal form)
the simplest form of issuing the command is
```
accumulate matrix [rmffile arffile {instrument-dependent-args} 
```
accumulating a matrix (short form)
in the case one wishes to accumulate many matrices, one can default the kind of accumulation setting the context to matrix, after which one can issue an arbitrary number of accumulation commands in the short form (if one wishes to interleave with another kind of accumulation it is sufficient to use the the normal form
```
xasset context m[atrix]
accumulate rmffile [arffile {instrument-dependent-args} 
```
invoking instrument dependent programs
one can also invoke specific programs directly by name

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sax.iasf-milano.inaf.it/Xashelp/maccum.html :: original creation 2002 Sep 04 17:42:35 CEST :: last edit 2002 Sep 04 17:42:35 CEST

15. Generating response matrices

accumulating a matrix (normal form)

accumulating a matrix (short form)

invoking instrument dependent programs

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