GNU Data Language (GDL) a free and open-source implementation ...

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IDL in Astronomy • The situation • IDL is widely used in astronomy, since 1977, including a lot of Space Missions (official pipelines) • Several well known libraries (Astron, MPFIT, Solar Soft, ...) used as commodity by Scientists • Code is rather well independant of OS’s (VMS, many Unix, OSX, Linux and also MS-win) and can live during very long time • Fast coding, nice for testing idea/modles/processing during data analysis Sylwester Arabas, Alain Coulais & Takeshi Enomoto GNU Data Language 4/ 34
IDL in Astronomy • The situation • IDL is widely used in astronomy, since 1977, including a lot of Space Missions (official pipelines) • Several well known libraries (Astron, MPFIT, Solar Soft, ...) used as commodity by Scientists • Code is rather well independant of OS’s (VMS, many Unix, OSX, Linux and also MS-win) and can live during very long time • Fast coding, nice for testing idea/modles/processing during data analysis • The problems ? • Dependence. IDL is not open source free software. We had serious warning in the past, some platforms (Unix, VMS) had desapear. Despite support by NASA, editor may desapear. Some choices by editor (widgets, limited graphical outputs, ...) upset users. Because of the large codebase, we cannot afford disparition! • No general purpose alternative. Now Python in Astronomy become a real alternative, but it was not he case 3 or 5 years ago. Sylwester Arabas, Alain Coulais & Takeshi Enomoto GNU Data Language 4/ 34
Page 1 and 2: GNU Data Language (GDL) a free and
Page 3: efore we begin with GDL: what’s I
Page 7 and 8: About GDL: the project and its auth
Page 13 and 14: About GDL: some pros and cons • i
Page 15 and 16: About GDL: some pros and cons • i
Page 17 and 18: About GDL: known users • people a
Page 25 and 26: About GDL: known users ...? • peo
Page 27 and 28: About GDL: how we use it • @ the
Page 29 and 30: About GDL: how others use it • At
Page 31 and 32: About GDL: how others use it • At
Page 33 and 34: Sylwester Arabas, Alain Coulais & T
Page 45 and 46: About GDL: how to get GDL • pre-c
Page 47 and 48: About GDL: how to get GDL • pre-c
Page 49 and 50: About GDL: how to help and contribu
Page 51 and 52: Hands-on: let’s start $ gdl GDL>
Page 53 and 54: Hands-on: CReSS-SDM example 1 pro c
Page 55 and 56:
NCDF OPEN & NCDF VARGET NCDF OPEN()
Page 57 and 58:
WHERE, ARRAY INDICES & REFORM WHERE
Page 59:
Sylwester Arabas, Alain Coulais & T
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