r4 - 18 Aug 2002 - 13:00:19 - TonyLindeYou are here: TWiki > 
Astrogrid Web > SRD > ArchitectureOverview > SystemReqs > LibraryFunctions
Astrogrid Web > SRD > ArchitectureOverview > SystemReqs > LibraryFunctions Library Functions
These may be needed to operate on table data or on NDim data. In the latter case we need to identify a minimum number of packages which can process as wide a range of data as possible.
See also a similar collection of CDS Java packages.
- AnitaRichards - 07 Aug 2002
If you know of a package like Starlink or Gaia that includes any of these functions, please add them in under "resource". Also, if there is a library function you consider important, please add it in.
-- ElizabethAuden - 18 Jul 2002
| Function | Resource |
| Astrometric alignment | Starlink |
| Coordinate transformation | Starlink</td |
| Proper motion | ? |
| Least squares fit | ? |
| Convert flux scales | ? |
| Express result as probability | ? |
| Apply K-correction (convert observed freq/power to emitted freq/power at cosmological distances) | ? |
| Fit 1- 2- or 3-D Gaussian component (e.g. to emission in spectra, images, datacubes) | AIPS(++), ? |
| Fit spectra to templates | ? |
| Convert between incremental frequency, wavelength, velocity, redshift, in various conventions | ? |
| Calculate spectral index, colour, temperature, optical depth, emission measure etc. | AIPS(++), ? |
| Measure noise in data | AIPS(++), ? |
| Calculate polarization parameters e.g. electric field vector direction, rotation measure | AIPS(++), ? |
| Compare results of models applied to data using different cosmological parameters (e.g. Hubble constant) | ? |
| Subtract one image (etc) from another | AIPS(++), ? |
| Search for periodicity, power spectra etc. (e.g. by FT) | Starlink? |
| Create density map | ? |
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