<s>
ROOT	O
is	O
an	O
object-oriented	B-Language
computer	B-Application
program	I-Application
and	O
library	B-Library
developed	O
by	O
CERN	O
.	O
</s>
<s>
It	O
was	O
originally	O
designed	O
for	O
particle	O
physics	O
data	B-General_Concept
analysis	I-General_Concept
and	O
contains	O
several	O
features	O
specific	O
to	O
the	O
field	O
,	O
but	O
it	O
is	O
also	O
used	O
in	O
other	O
applications	O
such	O
as	O
astronomy	O
and	O
data	B-Application
mining	I-Application
.	O
</s>
<s>
CERN	O
maintained	O
the	O
CERN	B-Application
Program	I-Application
Library	I-Application
written	O
in	O
FORTRAN	B-Application
for	O
many	O
years	O
.	O
</s>
<s>
Its	O
development	O
and	O
maintenance	O
were	O
discontinued	O
in	O
2003	O
in	O
favour	O
of	O
ROOT	O
,	O
which	O
is	O
written	O
in	O
the	O
C++	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
Some	O
parts	O
are	O
published	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
and	O
others	O
are	O
based	O
on	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
software	O
,	O
and	O
are	O
thus	O
also	O
published	O
under	O
the	O
terms	O
of	O
the	O
GPL	B-License
.	O
</s>
<s>
It	O
provides	O
platform	B-Operating_System
independent	I-Operating_System
access	O
to	O
a	O
computer	O
's	O
graphics	O
subsystem	O
and	O
operating	B-General_Concept
system	I-General_Concept
using	O
abstract	B-Application
layers	I-Application
.	O
</s>
<s>
Parts	O
of	O
the	O
abstract	O
platform	O
are	O
:	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
and	O
a	O
GUI	B-Application
builder	O
,	O
container	O
classes	O
,	O
reflection	B-Language
,	O
a	O
C++	B-Language
script	B-Language
and	O
command	B-Application
line	I-Application
interpreter	B-Application
(	O
CINT	B-Application
in	O
version	O
5	O
,	O
cling	O
in	O
version	O
6	O
)	O
,	O
object	B-Application
serialization	I-Application
and	O
persistence	B-Application
.	O
</s>
<s>
Histogramming	O
and	O
graphing	B-Application
to	O
view	O
and	O
analyze	O
distributions	O
and	O
functions	O
,	O
</s>
<s>
curve	B-Algorithm
fitting	I-Algorithm
(	O
regression	O
analysis	O
)	O
and	O
minimization	O
of	O
functionals	O
,	O
</s>
<s>
statistics	O
tools	O
used	O
for	O
data	B-General_Concept
analysis	I-General_Concept
,	O
</s>
<s>
matrix	B-Architecture
algebra	O
,	O
</s>
<s>
multivariate	O
data	B-General_Concept
analysis	I-General_Concept
,	O
e.g.	O
</s>
<s>
using	O
neural	B-Architecture
networks	I-Architecture
,	O
</s>
<s>
access	O
to	O
distributed	O
data	O
(	O
in	O
the	O
context	O
of	O
the	O
Grid	B-Architecture
)	O
,	O
</s>
<s>
distributed	B-Architecture
computing	I-Architecture
,	O
to	O
parallelize	O
data	B-General_Concept
analyses	I-General_Concept
,	O
</s>
<s>
persistence	B-Application
and	O
serialization	B-Application
of	O
objects	O
,	O
which	O
can	O
cope	O
with	O
changes	O
in	O
class	O
definitions	O
of	O
persistent	O
data	O
,	O
</s>
<s>
access	O
to	O
databases	B-Application
,	O
</s>
<s>
3D	B-Application
visualizations	I-Application
(	O
geometry	O
)	O
,	O
</s>
<s>
creating	O
files	O
in	O
various	O
graphics	O
formats	O
,	O
like	O
PDF	B-Application
,	O
PostScript	B-Language
,	O
PNG	O
,	O
SVG	B-Application
,	O
LaTeX	B-Application
,	O
etc	O
.	O
</s>
<s>
interfacing	O
Python	B-Language
code	I-Language
in	O
both	O
directions	O
,	O
</s>
<s>
interfacing	O
Monte	B-Algorithm
Carlo	I-Algorithm
event	B-Algorithm
generators	I-Algorithm
.	O
</s>
<s>
ROOT	O
is	O
mainly	O
used	O
in	O
data	B-General_Concept
analysis	I-General_Concept
and	O
data	B-Algorithm
acquisition	I-Algorithm
in	O
particle	O
physics	O
(	O
high	O
energy	O
physics	O
)	O
experiments	O
,	O
and	O
most	O
experimental	O
plots	O
and	O
results	O
in	O
those	O
subfields	O
are	O
obtained	O
using	O
ROOT	O
.	O
</s>
<s>
The	O
inclusion	O
of	O
a	O
C++	B-Language
interpreter	B-Application
(	O
CINT	B-Application
until	O
version	O
5.34	O
,	O
Cling	O
from	O
version	O
6.00	O
)	O
makes	O
this	O
package	O
very	O
versatile	O
as	O
it	O
can	O
be	O
used	O
in	O
interactive	O
,	O
scripted	O
and	O
compiled	O
modes	O
in	O
a	O
manner	O
similar	O
to	O
commercial	O
products	O
like	O
MATLAB	B-Language
.	O
</s>
<s>
using	O
ROOT	O
containers	O
instead	O
of	O
STL	B-Application
)	O
.	O
</s>
<s>
The	O
CINT	B-Application
interpreter	B-Application
,	O
for	O
example	O
,	O
has	O
been	O
replaced	O
by	O
the	O
Cling	O
interpreter	B-Application
,	O
and	O
numerous	O
bugs	O
are	O
fixed	O
with	O
every	O
release	O
.	O
</s>
