<s>
The	O
GNU	B-Language
Data	I-Language
Language	I-Language
(	O
GDL	B-Language
)	O
is	O
a	O
free	B-Application
alternative	O
to	O
IDL	B-Language
(	O
Interactive	B-Language
Data	I-Language
Language	I-Language
)	O
,	O
achieving	O
full	O
compatibility	O
with	O
IDL	B-Language
7	O
and	O
partial	O
compatibility	O
with	O
IDL	B-Language
8	O
.	O
</s>
<s>
Together	O
with	O
its	O
library	O
routines	O
,	O
GDL	B-Language
is	O
developed	O
to	O
serve	O
as	O
a	O
tool	O
for	O
data	O
analysis	O
and	O
visualization	O
in	O
such	O
disciplines	O
as	O
astronomy	O
,	O
geosciences	O
,	O
and	O
medical	O
imaging	O
.	O
</s>
<s>
GDL	B-Language
is	O
licensed	O
under	O
the	O
GPL	B-License
.	O
</s>
<s>
Other	O
open-source	O
numerical	O
data	O
analysis	O
tools	O
similar	O
to	O
GDL	B-Language
include	O
Julia	B-Application
,	O
Jupyter	O
Notebook	O
,	O
GNU	B-Language
Octave	I-Language
,	O
NCAR	O
Command	O
Language	O
(	O
NCL	O
)	O
,	O
Perl	B-Language
Data	I-Language
Language	I-Language
(	O
PDL	O
)	O
,	O
R	B-Language
,	O
Scilab	B-Application
,	O
SciPy	B-Application
,	O
and	O
Yorick	B-Language
.	O
</s>
<s>
GDL	B-Language
as	O
a	O
language	O
is	O
dynamically-typed	O
,	O
vectorized	O
,	O
and	O
has	O
object-oriented	O
programming	O
capabilities	O
.	O
</s>
<s>
GDL	B-Language
library	O
routines	O
handle	O
numerical	O
calculations	O
(	O
e.g.	O
</s>
<s>
GDL	B-Language
supports	O
several	O
data	O
formats	O
,	O
such	O
as	O
NetCDF	B-Application
,	O
HDF	B-Application
(	O
v4	O
&	O
v5	O
)	O
,	O
GRIB	B-Application
,	O
PNG	O
,	O
TIFF	O
,	O
and	O
DICOM	B-Algorithm
.	O
</s>
<s>
Graphical	O
output	O
is	O
handled	O
by	O
X11	B-Operating_System
,	O
PostScript	B-Language
,	O
SVG	B-Application
,	O
or	O
z-buffer	O
terminals	O
,	O
the	O
last	O
one	O
allowing	O
output	O
graphics	O
(	O
plots	O
)	O
to	O
be	O
saved	O
in	O
raster	O
graphics	O
formats	O
.	O
</s>
<s>
GDL	B-Language
features	O
integrated	O
debugging	O
facilities	O
,	O
such	O
as	O
breakpoints	O
.	O
</s>
<s>
GDL	B-Language
has	O
a	O
Python	B-Language
bridge	O
(	O
Python	B-Language
code	I-Language
can	O
be	O
called	O
from	O
GDL	B-Language
;	O
GDL	B-Language
can	O
be	O
compiled	O
as	O
a	O
Python	B-Language
module	O
)	O
.	O
</s>
<s>
GDL	B-Language
uses	O
Eigen	B-Language
(	O
C++	B-Language
library	O
)	O
numerical	O
library	O
(	O
similar	O
to	O
Intel	O
MKL	O
)	O
to	O
offer	O
high	O
computing	O
performance	O
on	O
multi-core	O
processors	O
.	O
</s>
<s>
Packaged	O
versions	O
of	O
GDL	B-Language
are	O
available	O
for	O
several	O
Linux	B-Application
and	O
BSD	B-Operating_System
flavours	O
as	O
well	O
as	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
.	O
</s>
<s>
The	O
source	O
code	O
compiles	O
on	O
Microsoft	B-Application
Windows	I-Application
and	O
other	O
UNIX	B-Application
systems	I-Application
,	O
including	O
Solaris	B-Application
.	O
</s>
<s>
GDL	B-Language
is	O
not	O
an	O
official	O
GNU	B-Application
package	I-Application
.	O
</s>
