<s>
RExcel	B-Operating_System
is	O
an	O
add-in	O
for	O
Microsoft	B-Application
Excel	I-Application
.	O
</s>
<s>
It	O
allows	O
access	O
to	O
the	O
statistics	B-Algorithm
package	I-Algorithm
R	B-Language
from	O
within	O
Excel	B-Application
.	O
</s>
<s>
data	O
transfer	O
(	O
matrices	O
and	O
data	O
frames	O
)	O
between	O
R	B-Language
and	O
Excel	B-Application
in	O
both	O
directions	O
;	O
</s>
<s>
running	O
R	B-Language
code	I-Language
directly	O
from	O
Excel	B-Application
ranges	O
;	O
</s>
<s>
writing	O
macros	O
calling	O
R	B-Language
to	O
perform	O
calculations	O
without	O
exposing	O
R	B-Language
to	O
the	O
user	O
;	O
</s>
<s>
calling	O
R	B-Language
functions	O
directly	O
from	O
cell	O
formulas	O
,	O
using	O
Excel	B-Application
's	O
autoupdate	O
mechanism	O
to	O
trigger	O
recalculation	O
by	O
R	B-Language
;	O
</s>
<s>
using	O
Excel	B-Application
as	O
a	O
GUI	B-Application
for	O
R	B-Language
,	O
making	O
R	B-Language
functionality	O
accessible	O
through	O
menus	O
and	O
dialog	O
boxes	O
instead	O
of	O
a	O
command	O
line-oriented	O
programming	O
style	O
.	O
</s>
<s>
Using	O
this	O
paradigm	O
,	O
the	O
GUI	B-Application
package	O
R	B-Language
Commander	O
is	O
available	O
as	O
an	O
Excel	B-Application
menu	O
bar	O
.	O
</s>
<s>
RExcel	B-Operating_System
works	O
on	O
Microsoft	B-Application
Windows	I-Application
(	O
XP	B-Application
,	O
Vista	B-Application
or	O
7	B-Device
)	O
,	O
with	O
Excel	B-Application
2003	I-Application
,	O
2007	B-Application
,	O
</s>
<s>
2010	B-Operating_System
,	O
and	O
2013	B-Operating_System
.	O
</s>
<s>
It	O
uses	O
the	O
statconnDCOM	O
server	O
and	O
,	O
for	O
certain	O
configurations	O
,	O
additionally	O
the	O
rcom	O
package	O
to	O
access	O
R	B-Language
from	O
within	O
Excel	B-Application
.	O
</s>
