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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Table of Contents



Introduction

The procedures in this directory are taken from the IDL program library at the Johns Hopkins University (JHU) Applied Physics Lab (APL) at http://fermi.jhuapl.edu/s1r/idl/idl.html. They are duplicated here either because they are used by other procedures in the Astronomy library, or because they are strongly related to Astronomy. Users who have both the Astronomy Library and the JHU library can delete this directory. Please inform Wayne Landsman if there are any discrepancies between these procedures and those in the JHUAPL library. (One known difference is with DATATYPE() which updated here for object and pointer data types.)

Index of Subroutines

FACTOR Find prime factors of a given number.
GETWRD Return the n'th word from a text string.
ISARRAY Tests if the argument is an array.
POLREC Convert 2-d polar coordinates to rectangular coordinates.
PRIME Return an array with the specified number of prime numbers.
RECPOL Convert 2-d rectangular coordinates to polar coordinates.
REDSHIFT Interactively converts between redshift, Recession velocity, & Distance
REPCHR Replace all occurrences of one character with another in a text string.
SPHDIST Angular distance between points on a sphere.
YMD2DN Convert from year, month, day to day number of year.
Last modified by pro2html on 2008 November 09 at 04:12 UTC

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Jörn Wilms (wilms@astro.uni-tuebingen.de)
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