<s>
In	O
computer	B-General_Concept
programming	I-General_Concept
,	O
an	O
Iliffe	B-Data_Structure
vector	I-Data_Structure
,	O
also	O
known	O
as	O
a	O
display	O
,	O
is	O
a	O
data	B-General_Concept
structure	I-General_Concept
used	O
to	O
implement	O
multi-dimensional	O
arrays	B-Data_Structure
.	O
</s>
<s>
An	O
Iliffe	B-Data_Structure
vector	I-Data_Structure
for	O
an	O
n-dimensional	O
array	O
(	O
where	O
n≥2	O
)	O
consists	O
of	O
a	O
vector	O
(	O
or	O
1-dimensional	O
array	O
)	O
of	O
pointers	O
to	O
an	O
(	O
n−1	O
)	O
-dimensional	O
array	O
.	O
</s>
<s>
They	O
are	O
often	O
used	O
to	O
avoid	O
the	O
need	O
for	O
expensive	O
multiplication	O
operations	O
when	O
performing	O
address	O
calculation	O
on	O
an	O
array	B-Data_Structure
element	I-Data_Structure
.	O
</s>
<s>
They	O
can	O
also	O
be	O
used	O
to	O
implement	O
jagged	B-Data_Structure
arrays	I-Data_Structure
,	O
such	O
as	O
triangular	O
arrays	B-Data_Structure
,	O
triangular	B-Algorithm
matrices	I-Algorithm
and	O
other	O
kinds	O
of	O
irregularly	O
shaped	O
arrays	B-Data_Structure
.	O
</s>
<s>
The	O
data	B-General_Concept
structure	I-General_Concept
is	O
named	O
after	O
John	O
K	O
.	O
Iliffe	O
.	O
</s>
<s>
The	O
Iliffe	B-Data_Structure
vector	I-Data_Structure
for	O
a	O
2-dimensional	O
array	O
is	O
simply	O
a	O
vector	O
of	O
pointers	O
to	O
vectors	O
of	O
data	O
,	O
i.e.	O
,	O
the	O
Iliffe	B-Data_Structure
vector	I-Data_Structure
represents	O
the	O
columns	O
of	O
an	O
array	O
where	O
each	O
column	O
element	O
is	O
a	O
pointer	O
to	O
a	O
row	O
vector	O
.	O
</s>
<s>
Multidimensional	O
arrays	B-Data_Structure
in	O
languages	O
such	O
as	O
Java	B-Language
,	O
Python	B-Language
(	O
multidimensional	O
lists	O
)	O
,	O
Ruby	B-Language
,	O
Visual	B-Language
Basic	I-Language
.NET	I-Language
,	O
Perl	B-Language
,	O
PHP	B-Application
,	O
JavaScript	B-Language
,	O
Objective-C	B-Language
(	O
when	O
using	O
NSArray	O
,	O
not	O
a	O
row-major	B-Data_Structure
C-style	O
array	O
)	O
,	O
Swift	B-Application
,	O
and	O
Atlas	O
Autocode	O
are	O
implemented	O
as	O
Iliffe	B-Data_Structure
vectors	I-Data_Structure
.	O
</s>
<s>
Iliffe	B-Data_Structure
vectors	I-Data_Structure
were	O
used	O
to	O
implement	O
sparse	O
multidimensional	O
arrays	B-Data_Structure
in	O
the	O
OLAP	O
product	O
Holos	O
.	O
</s>
<s>
Iliffe	B-Data_Structure
vectors	I-Data_Structure
are	O
contrasted	O
with	O
dope	B-Data_Structure
vectors	I-Data_Structure
in	O
languages	O
such	O
as	O
Fortran	O
,	O
which	O
contain	O
the	O
stride	O
factors	O
and	O
offset	O
values	O
for	O
the	O
subscripts	O
in	O
each	O
dimension	O
.	O
</s>
