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# What are SVDs and why use them
SVDs are able to approximate a matrix by doing something like an expansion where you can approximate the matrix with 2 column vectors with many terms and a coefficien…
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Hi,
Following observations of same galaxies in different years/months we ran into an issue where the redshifts were off by ~50 km/s. We were gladly ignoring heliocentric/barycentric corrections to ou…
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# Imported repos 20191230:
## euclid
*A Java library for 2D and 3D geometric calculations.*
This is fundamental to several other PMR repos, but development is now in the monolithic github.com/p…
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Test-h2co has a warning at the end
MODE FREQ(CM**-1) SYMMETRY RED. MASS IR INTENS. RAMAN ACT. DEPOLARIZ.
1 86.452 B2 3.821881 0.672525 2.946837 0.750000
2 …
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_Original ticket http://projects.scipy.org/scipy/ticket/1497 on 2011-08-21 by trac user miguel, assigned to unknown._
It would be useful to have one-dimensional and multi-dimensional interpolation cl…
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I'm working with the python codebase of opusreader and am trying to figure out the time data of my spectra.
I have a two channels of timeseries of absorbance spectra and am able to extract them from …
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From Alessandra Zanichelli, Vincenzo Galluzi, Marco Molinaro
Current values for dataproduct_type as in the preliminary document [Data Product Type vocabulary](https://www.ivoa.net/rdf/product-type…
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Dear Sam,
we are using Marz to redshift quasars and other objects in AAOmega data form the AAT for an eROSITA project. We are finding that the cross-correlation function for quasars often appear…
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I am a beginner of xrt and trying to demo a simple ray-tracing case. I constructed a beamline with a geometric source and a Si(111) DCM, and monitor the beam properties after the DCM by a screen calle…
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Hi there,
I'm a member of the data reduction pipelines group for G-CLEF (GMT-Consortium Large Earth Finder), an optical echelle spectrograph. We have been testing out a couple of optical extraction m…