<s>
GNU	B-Application
plotutils	I-Application
is	O
a	O
set	O
of	O
free	B-Application
software	I-Application
command-line	O
tools	O
and	O
software	B-Library
libraries	I-Library
for	O
generating	O
2D	O
plot	O
graphics	O
based	O
on	O
data	O
sets	O
.	O
</s>
<s>
It	O
is	O
used	O
in	O
projects	O
such	O
as	O
PSPP	B-Language
and	O
UMLgraph	O
,	O
and	O
in	O
many	O
areas	O
of	O
academic	O
research	O
,	O
and	O
is	O
included	O
in	O
many	O
Linux	B-Application
distributions	O
such	O
as	O
Debian	O
.	O
</s>
<s>
Windows	B-Application
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
versions	O
are	O
also	O
available	O
.	O
</s>
<s>
The	O
library	O
provides	O
bindings	O
for	O
the	O
C	B-Language
and	O
C++	B-Language
languages	I-Language
.	O
</s>
<s>
Its	O
stand-alone	O
command-line	O
tools	O
can	O
generate	O
graphs	O
and	O
perform	O
numerical	O
calculation	O
of	O
spline	B-Algorithm
curves	I-Algorithm
and	O
systems	O
of	O
ordinary	O
differential	O
equations	O
.	O
</s>
<s>
Plotutils	B-Application
is	O
a	O
GNU	B-Application
package	I-Application
and	O
is	O
distributed	O
under	O
a	O
free	B-License
software	I-License
licence	I-License
,	O
the	O
GPL	B-License
.	O
</s>
<s>
Several	O
utilities	O
were	O
inspired	O
by	O
Unix	B-Application
plotting	O
utilities	O
.	O
</s>
<s>
A	O
graph	B-Device
utility	O
and	O
various	O
plot	O
filters	O
were	O
present	O
in	O
the	O
first	O
releases	O
of	O
Unix	B-Application
from	O
Bell	O
Laboratories	O
.	O
</s>
<s>
By	O
the	O
time	O
of	O
Version	O
7	O
Unix	B-Application
,	O
graph	B-Device
,	O
plot	O
,	O
spline	B-Algorithm
,	O
and	O
several	O
device-dependent	O
versions	O
of	O
libplot	O
were	O
a	O
standard	O
Unix	B-Application
features	O
.	O
</s>
<s>
In	O
1989	O
,	O
the	O
first	O
GNU	O
versions	O
of	O
graph	B-Device
,	O
plot	O
,	O
tek2plot	O
,	O
spline	B-Algorithm
and	O
their	O
respective	O
documentation	O
were	O
written	O
.	O
</s>
<s>
In	O
1995	O
,	O
the	O
package	O
was	O
significantly	O
expanded	O
by	O
writing	O
a	O
device-independent	O
,	O
standalone	O
version	O
of	O
libplot	O
,	O
and	O
by	O
rewriting	O
graph	B-Device
from	O
scratch	O
,	O
turning	O
it	O
into	O
a	O
real-time	O
filter	O
.	O
</s>
<s>
GNU	O
graph	B-Device
,	O
which	O
plots	O
2-D	O
datasets	O
or	O
data	O
streams	O
in	O
real	O
time	O
.	O
</s>
<s>
GNU	B-Application
plot	I-Application
,	O
which	O
translates	O
GNU	O
Metafile	O
format	O
to	O
any	O
of	O
the	O
other	O
formats	O
.	O
</s>
<s>
GNU	O
tek2plot	O
,	O
for	O
translating	O
Tektronix	B-General_Concept
4010	I-General_Concept
data	O
to	O
any	O
of	O
the	O
above	O
formats	O
.	O
</s>
<s>
GNU	O
pic2plot	O
,	O
for	O
translating	O
the	O
pic	B-Language
language	I-Language
to	O
any	O
of	O
the	O
above	O
formats	O
.	O
</s>
<s>
GNU	O
spline	B-Algorithm
,	O
which	O
does	O
spline	B-Algorithm
interpolation	O
of	O
data	O
.	O
</s>
