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STARDEV  June 2008

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Subject:

Re: complex data in SMURF

From:

"Malcolm J. Currie" <[log in to unmask]>

Reply-To:

Starlink development <[log in to unmask]>

Date:

Fri, 13 Jun 2008 15:08:50 +0100

Content-Type:

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TEXT/PLAIN (25 lines)

> > Kappa will work with complex data, but will convert it to real data by
> > throwing away the imaginary part. This may or may not be of any use to
> > Ed, depending on what he wants to do.
>
> I see, thanks. Looking at FIGARO I see there are some commands that might
> be helpful, cmplx2i for instance copies the IMAGINARY data to the REAL
> part of an ordinary NDF.

There's I2CMPLX to go the other way to reassemble after independent
processing.  It's clunky and open to error to have to make another NDF
to process the imaginary part independently, but at least there is a
route.

Hitherto there's been insufficient (i.e vritually no) demand for
processing complex data, although we expected otherwise, hence its
inclusion in the NDF design.  Also there are historical reasons.
Figaro already had some functionality in this area (albeit on DSTs), and
complex types weren't available in the IMAGE-format era in the first
few years of KAPPA's existence.  KAPPA routines consequently don't use
NDF_MAPZ and have no checksfor COMPLEX_<numeric_type> (in addition to the
regular <numeric_type>) to do appropriate processing.  Complex-data
processing could be added as needs arose, and in many cases it would not
require much effort.

Malcolm

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