<s>
IT++	B-Language
is	O
a	O
C++	B-Language
library	O
of	O
classes	B-Application
and	O
functions	O
for	O
linear	B-Language
algebra	I-Language
,	O
numerical	O
optimization	O
,	O
signal	O
processing	O
,	O
communications	O
,	O
and	O
statistics	O
.	O
</s>
<s>
The	O
IT++	B-Language
library	O
originates	O
from	O
the	O
former	O
Department	O
of	O
Information	O
Theory	O
at	O
the	O
Chalmers	O
University	O
of	O
Technology	O
,	O
Gothenburg	O
,	O
Sweden	O
.	O
</s>
<s>
The	O
kernel	O
of	O
the	O
IT++	B-Language
library	O
is	O
templated	B-Application
vector	O
and	O
matrix	O
classes	B-Application
,	O
and	O
a	O
set	O
of	O
accompanying	O
functions	O
.	O
</s>
<s>
Such	O
a	O
kernel	O
makes	O
IT++	B-Language
library	O
similar	O
to	O
Matlab/Octave	O
.	O
</s>
<s>
For	O
increased	O
functionality	O
,	O
speed	O
and	O
accuracy	O
,	O
IT++	B-Language
can	O
make	O
extensive	O
use	O
of	O
existing	O
free	B-License
and	I-License
open	I-License
source	I-License
libraries	O
,	O
especially	O
BLAS	B-Application
,	O
LAPACK	B-Application
and	O
FFTW	B-Application
libraries	O
.	O
</s>
<s>
Instead	O
of	O
BLAS	B-Application
and	O
LAPACK	B-Application
,	O
some	O
optimized	O
platform-specific	O
libraries	O
can	O
be	O
used	O
as	O
well	O
,	O
i.e.	O
</s>
<s>
ATLAS	B-Language
(	O
Automatically	B-Language
Tuned	I-Language
Linear	I-Language
Algebra	I-Language
Software	I-Language
)	O
-	O
includes	O
optimised	O
BLAS	B-Application
,	O
CBLAS	B-Application
and	O
a	O
limited	O
set	O
of	O
LAPACK	B-Application
routines	O
;	O
</s>
<s>
MKL	B-Language
(	O
Intel	B-Language
Math	I-Language
Kernel	I-Language
Library	I-Language
)	O
-	O
includes	O
all	O
required	O
BLAS	B-Application
,	O
CBLAS	B-Application
,	O
LAPACK	B-Application
and	O
FFT	O
routines	O
(	O
FFTW	B-Application
not	O
required	O
)	O
;	O
</s>
<s>
ACML	B-Library
(	O
AMD	B-Library
Core	I-Library
Math	I-Library
Library	I-Library
)	O
-	O
includes	O
BLAS	B-Application
,	O
LAPACK	B-Application
and	O
FFT	O
routines	O
(	O
FFTW	B-Application
not	O
required	O
)	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
compile	O
and	O
use	O
IT++	B-Language
without	O
any	O
of	O
the	O
above-listed	O
libraries	O
,	O
but	O
the	O
functionality	O
will	O
be	O
reduced	O
.	O
</s>
<s>
IT++	B-Language
works	O
on	O
Linux	B-Application
,	O
Solaris	B-Application
,	O
Windows	B-Application
(	O
with	O
Cygwin	B-Language
,	O
MinGW/MSYS	O
,	O
or	O
Microsoft	B-Application
Visual	I-Application
C++	I-Application
)	O
and	O
OS	B-Operating_System
X	I-Operating_System
operating	O
systems	O
.	O
</s>
<s>
Here	O
is	O
a	O
trivial	O
example	O
demonstrating	O
the	O
IT++	B-Language
functionality	O
similar	O
to	O
Matlab/Octave	O
,	O
</s>
