<s>
EISPACK	B-Application
is	O
a	O
software	B-Library
library	I-Library
for	O
numerical	B-General_Concept
computation	I-General_Concept
of	O
eigenvalues	O
and	O
eigenvectors	O
of	O
matrices	B-Architecture
,	O
written	O
in	O
FORTRAN	B-Application
.	O
</s>
<s>
It	O
contains	O
subroutines	O
for	O
calculating	O
the	O
eigenvalues	O
of	O
nine	O
classes	O
of	O
matrices	B-Architecture
:	O
complex	O
general	O
,	O
complex	O
Hermitian	B-Algorithm
,	O
real	O
general	O
,	O
real	O
symmetric	O
,	O
real	O
symmetric	O
banded	B-Algorithm
,	O
real	O
symmetric	O
tridiagonal	O
,	O
special	O
real	O
tridiagonal	O
,	O
generalized	O
real	O
,	O
and	O
generalized	O
real	O
symmetric	O
matrices	B-Architecture
.	O
</s>
<s>
Originally	O
written	O
around	O
1972	O
–	O
1973	O
,	O
EISPACK	B-Application
,	O
like	O
LINPACK	B-Application
and	O
MINPACK	B-Application
,	O
originated	O
from	O
Argonne	O
National	O
Laboratory	O
,	O
has	O
always	O
been	O
free	O
,	O
and	O
aims	O
to	O
be	O
portable	B-Architecture
,	O
robust	O
and	O
reliable	O
.	O
</s>
<s>
The	O
library	O
drew	O
heavily	O
on	O
algorithms	O
developed	O
by	O
James	O
Wilkinson	O
,	O
which	O
were	O
originally	O
implemented	O
in	O
ALGOL	B-Language
.	O
</s>
<s>
Brian	O
Smith	O
led	O
a	O
team	O
at	O
Argonne	O
developing	O
EISPACK	B-Application
,	O
initially	O
by	O
translating	O
these	O
algorithms	O
into	O
FORTRAN	B-Application
.	O
</s>
<s>
Jack	O
Dongarra	O
joined	O
the	O
team	O
as	O
an	O
undergraduate	O
intern	O
at	O
Argonne	O
,	O
and	O
later	O
went	O
on	O
to	O
create	O
LAPACK	B-Application
,	O
which	O
has	O
largely	O
superseded	O
EISPACK	B-Application
and	O
LINPACK	B-Application
.	O
</s>
